<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0120-5609</journal-id>
<journal-title><![CDATA[Ingeniería e Investigación]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. Investig.]]></abbrev-journal-title>
<issn>0120-5609</issn>
<publisher>
<publisher-name><![CDATA[Facultad de Ingeniería, Universidad Nacional de Colombia.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0120-56092011000300005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Análisis de los fenómenos de transferencia en el proceso de evaporación osmótica]]></article-title>
<article-title xml:lang="en"><![CDATA[Analysing transfer phenomena in osmotic evaporation]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Forero Longas]]></surname>
<given-names><![CDATA[Freddy]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vélez Pasos]]></surname>
<given-names><![CDATA[Carlos Antonio]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Tolima  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Campinas  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>31</volume>
<numero>3</numero>
<fpage>40</fpage>
<lpage>49</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0120-56092011000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0120-56092011000300005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0120-56092011000300005&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La evaporación osmótica es una modificación de los procesos tradicionales que utilizan membranas; mediante un diferencial de presión de vapor, producido por una solución de extracción fuertemente concentrada, se transfiere agua solo en forma de vapor a través de una membrana que actúa como cuerpo hidrófobo. Este proceso tiene múltiples ventajas comparado con los procesos tradicionales, pues permite trabajar a presión atmosférica y baja temperatura, ideal para productos sensibles al calor. En este documento se presentan y analizan de forma sintética los fenómenos de transferencia de masa y calor del proceso y se describen los modelos usados para calcular parámetros de interés como flujos, temperaturas, coeficientes de transferencia y sus interrelaciones cuando se utilizan módulos de fibras huecas, con el fin de proveer una herramienta de consulta rápida y concreta.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Osmotic evaporation is a modification of traditional processes using membranes; by means of a vapour pressure differential, produced by a highly concentrated extraction solution, water is transferred through a hydrophobic membrane as vapour. This technique has many advantages over traditional processes, allowing work at atmospheric pressure and low temperatures, this being ideal for heat-sensitive products. This paper presents and synthetically analyses the phenomena of heat and mass transfer which occurs in the process and describes the models used for estimating the parameters of interest, such as flow, temperature, heat transfer rate and the relationships that exist amongst them when hollow fibre modules are used, providing a quick reference tool and specific information about this process.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[concentración]]></kwd>
<kwd lng="es"><![CDATA[transferencia de masa]]></kwd>
<kwd lng="es"><![CDATA[transferencia de calor]]></kwd>
<kwd lng="es"><![CDATA[membrana hidrófoba]]></kwd>
<kwd lng="es"><![CDATA[difusión]]></kwd>
<kwd lng="en"><![CDATA[concentration]]></kwd>
<kwd lng="en"><![CDATA[mass transfer]]></kwd>
<kwd lng="en"><![CDATA[heat transfer]]></kwd>
<kwd lng="en"><![CDATA[hydrophobic membrane]]></kwd>
<kwd lng="en"><![CDATA[diffusion]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <font face="verdana" size="2">     <p align="center"><font size="4"><b>An&aacute;lisis de los fen&oacute;menos de transferencia en el proceso de evaporaci&oacute;n osm&oacute;tica</b></font></p>     <p align="center"><font size="3"><b>Analysing transfer phenomena in osmotic evaporation</b></font></p>     <p><b>Freddy Forero Longas<sup>1</sup>, Carlos Antonio V&eacute;lez Pasos<sup>2</sup></b></p>      <p><sup>1</sup> Ingeniero Agroindustrial, Universidad del Tolima. Estudiante de doctorado en Ingenier&iacute;a de Alimentos. Universidad del Valle. <a href="mailto:freddy.forero@correounivalle.edu.co">freddy.forero@correounivalle.edu.co</a></p>     <p><sup>2</sup> Doctor en Ingenier&iacute;a de Alimentos, Universidad de Campinas, Brasil. Profesor titular, Universidad del Valle. <a href="mailto:carlos.velez@correounivalle.edu.co">carlos.velez@correounivalle.edu.co</a></p> <hr>      <p><b>RESUMEN</b></p>      <p>La evaporaci&oacute;n osm&oacute;tica es una modificaci&oacute;n de los procesos tradicionales que utilizan membranas; mediante un diferencial de presi&oacute;n de vapor, producido por una soluci&oacute;n de extracci&oacute;n fuertemente concentrada, se transfiere agua solo en forma de vapor a trav&eacute;s de una membrana que act&uacute;a como cuerpo hidr&oacute;fobo. Este proceso tiene m&uacute;ltiples ventajas comparado con los procesos tradicionales, pues permite trabajar a presi&oacute;n atmosf&eacute;rica y baja temperatura, ideal para productos sensibles al calor. En este documento se presentan y analizan de forma sint&eacute;tica los fen&oacute;menos de transferencia de masa y calor del proceso y se describen los modelos usados para calcular par&aacute;metros de inter&eacute;s como flujos, temperaturas, coeficientes de transferencia y sus interrelaciones cuando se utilizan m&oacute;dulos de fibras huecas, con el fin de proveer una herramienta de consulta r&aacute;pida y concreta.</p>     <p><b>Palabras clave</b>: concentraci&oacute;n, transferencia de masa, transferencia de calor, membrana hidr&oacute;foba, difusi&oacute;n.</p> <hr>      <p><b>ABSTRACT</b></p>      ]]></body>
<body><![CDATA[<p>Osmotic evaporation is a modification of traditional processes using membranes; by means of a vapour pressure differential, produced by a highly concentrated extraction solution, water is transferred through a hydrophobic membrane as vapour. This technique has many advantages over traditional processes, allowing work at atmospheric pressure and low temperatures, this being ideal for heat-sensitive products. This paper presents and synthetically analyses the phenomena of heat and mass transfer which occurs in the process and describes the models used for estimating the parameters of interest, such as flow, temperature, heat transfer rate and the relationships that exist amongst them when hollow fibre modules are used, providing a quick reference tool and specific information about this process.</p>     <p><b>Keywords</b>: concentration, mass transfer, heat transfer, hydrophobic membrane, diffusion.</p> <hr>     <p><b>Recibido</b>: febrero 3 de 2011 <b>Aceptado</b>: noviembre 20 de 2011</p> <hr>      <p><font size="3"><b>Introducci&oacute;n</b></font></p>      <p>La evaporaci&oacute;n osm&oacute;tica (EO), una de las variantes de la destilaci&oacute;n por membranas (DM), utiliza membranas hidr&oacute;fobas cuyos poros se llenan con la fase gaseosa del fluido que se desea concentrar, lo que previene la penetraci&oacute;n del agua, de tal modo que solo los componentes vol&aacute;tiles de la alimentaci&oacute;n pueden ser transportados a trav&eacute;s de la membrana (Sur <i>et al</i>., 2008). La diferencia de presi&oacute;n parcial de los l&iacute;quidos que se encuentran separados por la membrana dentro del sistema es generalmente aceptada como la fuerza impulsora, cuyo valor depende de la temperatura y composici&oacute;n de las capas adyacentes a la superficie de la membrana; el gradiente de presi&oacute;n parcial puede formarse por las diferencias de temperatura y concentraci&oacute;n (Bui <i>et al</i>., 2004; Gryta <i>et al</i>., 2005; Ravindra <i>et al.</i>, 2008; Shen <i>et al</i>., 2008).</p>      <p>La DM se lleva a cabo de varios modos, seg&uacute;n la forma de colectar el permeado, el mecanismo de transferencia de masa por la membrana y el origen de la fuerza impulsora, caracter&iacute;sticas que han sido utilizadas para generar la nomenclatura usada en estas t&eacute;cnicas. El t&eacute;rmino "evaporaci&oacute;n osm&oacute;tica" ha sido generalizado (Courel <i>et al</i>., 2000; Romero <i>et al</i>., 2003a) sin necesidad de mencionar las palabras "destilaci&oacute;n por membranas", a fin de resaltar la marcada influencia de la concentraci&oacute;n en el proceso. Algunos autores la denominan tambi&eacute;n destilaci&oacute;n osm&oacute;tica, concentraci&oacute;n osm&oacute;tica o destilaci&oacute;n isot&eacute;rmica (Petrotos <i>et al</i>., 2001). Esta t&eacute;cnica ha despertado bastante inter&eacute;s en el &aacute;rea del procesamiento de alimentos l&iacute;quidos, como la concentraci&oacute;n de jugos de frutas (Shaw <i>et al</i>., 2001; Vaillant <i>et al</i>., 2001; Valdes <i>et al</i>., 2009), vegetales, leche, caf&eacute; instant&aacute;neo, t&eacute; y otros productos sensitivos al calor, al poder trabajar a presi&oacute;n atmosf&eacute;rica, temperatura ambiente y condiciones casi isot&eacute;rmicas (Bailey <i>et al</i>., 2000; Nii <i>et al</i>., 2002), eliminando las reacciones de pardea-miento no enzim&aacute;tico y Maillard, degradaci&oacute;n de color, sabor y p&eacute;rdida de aromas, sumado a todo esto el bajo consumo energ&eacute;tico.</p>      <p><b>Fen&oacute;menos de transporte</b></p>      <p>El elemento poroso de la membrana del sistema de EO se encuentra en contacto &iacute;ntimo con los dos l&iacute;quidos circulantes y la temperatura del fluido a concentrar es baja y cercana a la de la salmuera. Gracias a la hidrofobicidad del pol&iacute;mero la membrana no puede ser mojada por los l&iacute;quidos, creando una interfaz vapor-l&iacute;quido a la entrada de los poros; la diferencia en actividad de agua entre la soluci&oacute;n acuosa y la salmuera se traduce en una diferencia de presiones de vapor, convirti&eacute;ndose en la fuerza impulsora para el transporte de agua en forma de vapor (<a href="img/revistas/iei/v31n3/v31n3a05f1.JPG" target="_blank">figura 1a</a>). El proceso de transporte de masa puede ser dividido en tres etapas: el paso inicial y final corresponde a la transferencia de agua desde la soluci&oacute;n diluida por medio de la interfaz de evaporaci&oacute;n y viceversa, desde la superficie de condensaci&oacute;n hacia la salmuera; el paso intermedio es el movimiento en fase de vapor a trav&eacute;s del material poroso (Romero <i>et al</i>., 2003b; Tha-nedgunbaworn <i>et al</i>., 2009). La diferencia de presi&oacute;n de vapor a trav&eacute;s de la membrana se obtiene generalmente con soluciones de sales como NaCl, CaCl<sub>2</sub>, MgCl<sub>2</sub>, MgSO<sub>4</sub> (Gryta, 2001; Bandini <i>et al</i>., 2002; Bui <i>et al</i>., 2003) y algunos l&iacute;quidos org&aacute;nicos como glicerol y poliglicoles (Alves <i>et al</i>., 2002; Celere <i>et al</i>., 2004; Celere <i>et al</i>., 2005), que en general presentan alta solubilidad, baja actividad de agua y alta tensi&oacute;n superficial.</p>      <p><b>Masa</b></p>     <p>El modelo b&aacute;sico para describir el sistema est&aacute; dado por la <a href="#ec1">ecuaci&oacute;n (1)</a> que relaciona el flux y la fuerza impulsora mediante una constante de proporcionalidad (coeficiente de transferencia de masa), la cual es considerada como permeabilidad de la membrana (Cassano <i>et al</i>., 2003; Alves <i>et al</i>., 2004).</p>     ]]></body>
<body><![CDATA[<p align="center"><a name="ec1"></a><img src="img/revistas/iei/v31n3/v31n3a05ec1.JPG"></p>      <p>Puesto que las condiciones existentes en la interfaz no siempre est&aacute;n disponibles, una representaci&oacute;n m&aacute;s completa del proceso est&aacute; dada por la <a href="#ec2">ecuaci&oacute;n (2)</a>, donde el coeficiente global K integra varias resistencias a la transferencia de masa (<a href="img/revistas/iei/v31n3/v31n3a05f1.JPG" target="_blank">figura 1b</a>).</p>     <p align="center"><a name="ec2"></a><img src="img/revistas/iei/v31n3/v31n3a05ec2.JPG"></p>      <p>La presi&oacute;n de vapor de agua a la entrada de los poros tanto de la soluci&oacute;n diluida como de la salmuera est&aacute; relacionada con la temperatura y actividad prevaleciente en la interfaz de la membrana; esta condici&oacute;n es muy &uacute;til al momento de calcular la permeabilidad (K), para lo cual se pueden usar las siguientes expresiones:</p>     <p align="center"><a name="ec3y4"></a><img src="img/revistas/iei/v31n3/v31n3a05ec3y4.JPG"></p>      <p><b><i>Mecanismos difusionales</i></b></p>      <p>Debido a que en los poros de la membrana se tiene aire proveniente del l&iacute;quido alimentado que se encuentra cercano a la presi&oacute;n atmosf&eacute;rica, te&oacute;ricamente solo dos mecanismos pueden estar involucrados en la transferencia de vapor, difusi&oacute;n de Knudsen y difusi&oacute;n molecular, de acuerdo con la teor&iacute;a cin&eacute;tica de los gases (Thanedgunbaworn <i>et al</i>/., 2007a). El n&uacute;mero de Knudsen (Kn) definido por la <a href="#ec5y6">ecuaci&oacute;n (5)</a> es usado como un primer criterio para determinar cu&aacute;l de los dos mecanismos de difusi&oacute;n puede ser el predominante, comparando la trayectoria media libre <i>(X) </i>de la mol&eacute;cula que se difunde con el radio de los poros en la membrana (Qtaishat <i>et al</i>., 2008).</p>     <p align="center"><a name="ec5y6"></a><img src="img/revistas/iei/v31n3/v31n3a05ec5y6.JPG"></p>      <p>Para un tama&ntilde;o de poro relativamente peque&ntilde;o, Kn &ge; 10, las mol&eacute;culas tienden a colisionar frecuentemente con las paredes del poro y el modelo Knudsen (7) es el m&aacute;s conveniente. Por ejemplo, la trayectoria media libre para el vapor de agua es de 0,3 &micro;m a presi&oacute;n atmosf&eacute;rica y 25 &deg;C, valor que se encuentra en el rango de los tama&ntilde;os t&iacute;picos de poro en membranas usadas para EO (Varavuth et al., 2009).</p>     <p align="center"><a name="ec7y8"></a><img src="img/revistas/iei/v31n3/v31n3a05ec7y8.JPG"></p>      ]]></body>
<body><![CDATA[<p>Cuando los poros son grandes, <i>Kn &le; </i>0,01, las mol&eacute;culas de gas colisionan m&aacute;s frecuentemente entre s&iacute;, la difusi&oacute;n molecular es considerada predominante (Celere <i>et al</i>/., 2002) y el flujo de vapor puede ser descrito por la <a href="#ec9,10y11">ecuaci&oacute;n (9)</a>, donde P<sub>Alm</sub> es la presi&oacute;n media logar&iacute;tmica dentro de los poros y D (coeficiente difusional) es funci&oacute;n de la temperatura y la presi&oacute;n (11).</p>     <p align="center"><a name="ec9,10y11"></a><img src="img/revistas/iei/v31n3/v31n3a05ec9,10y11.JPG"></p>      <p>Finalmente, en la regi&oacute;n de transici&oacute;n, 0,01 &lt; <i>Kn &lt; </i>10, los dos fen&oacute;menos se combinan y en este caso la mejor opci&oacute;n es utilizar un modelo mixto (12) con una permeabilidad del tipo <img src="img/revistas/iei/v31n3/v31n3a05ec11.1.JPG">(13), en la cual se incluye el t&eacute;rmino <i>P</i><sub>Alm</sub>, que tiene en cuenta el efecto del aire presente en los poros (Chen <i>et al., </i>2009).</p>     <p align="center"><a name="ec12y13"></a><img src="img/revistas/iei/v31n3/v31n3a05ec12y13.JPG"></p>      <p>Las ecuaciones anteriores deben manejarse con cuidado cuando se usan para prop&oacute;sitos predictivos debido a que cualquier membrana tiene una distribuci&oacute;n m&aacute;s o menos amplia de tama&ntilde;o de poro y formas irregulares, por lo que c&aacute;lculos basados solo en el di&aacute;metro nominal son una estimaci&oacute;n general de la permeabilidad actual de la membrana, debiendo este di&aacute;metro ser cuantificado experimentalmente (Koroknai <i>et al</i>., 2006).</p>      <p><b><i>Equilibrio l&iacute;quido-vapor</i></b></p>      <p>Para el caso de la EO se estable un equilibrio l&iacute;quido-vapor en las interfaces de la membrana hidr&oacute;foba tanto del lado del producto como de la salmuera; este equilibrio puede cambiar al ser afectado directamente por las propiedades f&iacute;sicas de las soluciones y las condiciones hidrodin&aacute;micas del m&oacute;dulo; la actividad de agua (a<sub>w</sub>) se convierte un factor cr&iacute;tico dentro del proceso, cuyo cambio se puede conocer mediante la <a href="#ec14">ecuaci&oacute;n (14)</a> (Bui <i>et al</i>., 2005a; Prausnitz <i>et al</i>., 2000).</p>     <p align="center"><a name="ec14"></a><img src="img/revistas/iei/v31n3/v31n3a05ec14.JPG"></p>      <p>donde el coeficiente de actividad (&#947;), puede ser determinado experimentalmente o por medio de modelos te&oacute;ricos. El m&eacute;todo Unifac modificado (<i>Modified UNIquac Funtional-group Activity Coefficients</i>) puede ser aplicado con buenos resultados en la alimentaci&oacute;n cuando esta contiene gran cantidad de az&uacute;cares simples como sacarosa, glucosa, fructosa, los cuales se encuentran con frecuencia en jugos de frutas (Starzak <i>et al</i>., 2006; Gaida <i>et al</i>., 2006; Gharsallaoui <i>et al</i>., 2008).</p>      <p>Cuando las concentraciones i&oacute;nicas en la salmuera son bajas la distancia media entre los iones es grande, en cuyo caso s&oacute;lo son importantes las fuerzas electrost&aacute;ticas de largo alcance; cuando las concentraciones son altas los iones comienzan a interactuar con fuerzas repulsivas (efecto de volumen excluido) y atractivas (Van der Waals). En esta situaci&oacute;n el m&eacute;todo de contribuci&oacute;n de grupos ASOG (<i>Analytical Solution of Groups</i>) es muy acertado para predecir el coeficiente de actividad en soluciones formadas por solutos del tipo sal (NaCl, CaCl<sub>2</sub>, KOH), bien sean binarias o multicomponentes (Huang <i>et al</i>., 2009).</p>      ]]></body>
<body><![CDATA[<p>Con estas metodolog&iacute;as el coeficiente de actividad es calculado usando tres t&eacute;rminos: uno de combinaci&oacute;n (ln y<sub>i</sub><sup>C</sup>), el cual considera la forma y tama&ntilde;o de cada grupo; otro residual (ln y<sub>i</sub><sup>R</sup>), que suma las interacciones est&eacute;ricas entre todos los grupos presentes en el l&iacute;quido; y para el caso de la soluci&oacute;n salina, en la <a href="#ec15">ecuaci&oacute;n 15</a> se adiciona un t&eacute;rmino (ln y<sub>i</sub><sup>DH</sup>) que representa el efecto de las interacciones electrost&aacute;ticas o teor&iacute;a Debye-Huckel (Correa <i>et al., </i>1997).</p>     <p align="center"><a name="ec15"></a><img src="img/revistas/iei/v31n3/v31n3a05ec15.JPG"></p>      <p><b><i>Coeficientes de transferencia</i></b></p>      <p>El flujo de agua por las capas de polarizaci&oacute;n tanto del lado de la alimentaci&oacute;n como del permeado, puede ser expresado en su forma m&aacute;s sencilla mediante las <a href="#ec16y17">ecuaciones (16)</a> y <a href="#ec16y17">(17)</a>, aunque algunos autores desprecian estas capas de polarizaci&oacute;n en casos donde la alimentaci&oacute;n es solo agua y bajo condiciones en las cuales se pretende cuantificar otros par&aacute;metros de la membrana (Courel <i>et al</i>., 2001).</p>     <p align="center"><a name="ec16y17"></a><img src="img/revistas/iei/v31n3/v31n3a05ec16y17.JPG"></p>      <p>Si se tiene en cuenta la resistencia debida a la polarizaci&oacute;n en la EO, las concentraciones en las capas l&iacute;mites de la membrana son estimadas por el modelo simplificado expuesto en las ecuaciones <a href="#ec18y19">(18)</a> y <a href="#ec18y19">(19)</a>, que no toma en cuenta el cambio de distribuci&oacute;n de la capa a lo largo del m&oacute;dulo.</p>     <p align="center"><a name="ec18y19"></a><img src="img/revistas/iei/v31n3/v31n3a05ec18y19.JPG"></p>      <p>Al tratarse de m&oacute;dulos de fibras huecas pueden aplicarse modelos semiemp&iacute;ricos para predecir el coeficiente <i>k</i><sub>a</sub>, para lo cual el flujo de la alimentaci&oacute;n dentro de la fibra puede asimilarse al que se presenta en una tuber&iacute;a. Por tal raz&oacute;n, la ecuaci&oacute;n de Sieder-Tate y sus an&aacute;logas para transferencia de masa - <a href="#ec20y21">ecuaciones (20)</a> y <a href="#ec20y21">(21)</a>- pueden ser aplicadas satisfactoriamente (Mart&iacute;nez-D&iacute;ez <i>et al</i>., 2000).</p>     <p align="center"><a name="ec20y21"></a><img src="img/revistas/iei/v31n3/v31n3a05ec20y21.JPG"></p>      <p>Se han realizado varios estudios para generar modelos con la finalidad de estimar el coeficiente (<i>k</i><sub>p</sub>) por fuera de los fibras huecas -lado de la carcasa- (Wu <i>et al., </i>2000; Gawronski, 2000; Lipnizki, 2001). Recientemente Thanedgunbaworn y cols. (2007b) desarrollaron una nueva expresi&oacute;n (22), con la cual lograron una mejor descripci&oacute;n del fen&oacute;meno, encontrando que el n&uacute;mero de Reynolds es una funci&oacute;n de la densidad de empaquetamiento ( <sup>&Oslash;</sup> ).</p>     ]]></body>
<body><![CDATA[<p align="center"><a name="ec22y23"></a><img src="img/revistas/iei/v31n3/v31n3a05ec22y23.JPG"></p>      <p><b>Calor</b></p>     <p>El proceso de EO es considerado isot&eacute;rmico siempre que no exista una diferencia de temperatura a trav&eacute;s de la membrana. No obstante, debido al calor latente del cambio de fase ocurrido en las paredes la evaporaci&oacute;n genera un ligero enfriamiento en la alimentaci&oacute;n y la condensaci&oacute;n calienta la salmuera, con lo cual la transferencia de masa est&aacute; asociada con la de calor; esta diferencia de temperatura resultante se convierte en un decaimiento del gradiente de presi&oacute;n de vapor, con la consiguiente disminuci&oacute;n de la fuerza impulsora (Courel <i>et al</i>., 2000). La <a href="#f2">figura 2</a> muestra el mecanismo de transferencia de calor como un conjunto de resistencias y un perfil de temperaturas bajo condiciones medias; las <a href="#ec24y25">expresiones (24)</a> y <a href="#ec24y25">(25)</a> representan el balance de calor en los diferentes compartimentos del sistema y el coeficiente total, respectivamente.</p>     <p align="center"><a name="f2"></a><img src="img/revistas/iei/v31n3/v31n3a05f2.JPG"></p>     <p align="center"><a name="ec24y25"></a><img src="img/revistas/iei/v31n3/v31n3a05ec24y25.JPG"></p>      <p>Este balance general de calor es aplicable tanto a m&oacute;dulos de membranas planas como de fibra hueca. La gran diferencia para estos dos sistemas radica en el c&aacute;lculo de los coeficientes de transferencia, debido especialmente a las particularidades geom&eacute;tricas y caracter&iacute;sticas f&iacute;sicas como porosidad, conductividad, tortuosidad, colmataci&oacute;n y rugosidad (Drioli <i>et al</i>., 2005), entre otros, que afectan la magnitud de los coeficientes; sumado a esto se tienen las caracter&iacute;sticas hidrodin&aacute;micas diferentes, que generalmente favorecen la transferencia en m&oacute;dulos de fibras huecas (Mart&iacute;nez <i>et al</i>.,2006).</p>      <p>El flujo de calor generado a trav&eacute;s de la membrana incrementa el diferencial de temperatura, proceso que contin&uacute;a hasta que se alcanza un valor asint&oacute;tico &Delta;T (26) donde el flux de calor convectivo ( &nbsp;<img src="img/revistas/iei/v31n3/v31n3a05ec25.1.JPG">&nbsp;) es exactamente balanceado por el retroflujo de calor conductivo (&nbsp;<img src="img/revistas/iei/v31n3/v31n3a05ec25.2.JPG">&nbsp;), por tal motivo las membranas deben ser tan conductivas como sea posible. El efecto de &Delta;T&infin; en la fuerza impulsora para el transporte de agua puede ser evaluado por la ecuaci&oacute;n de Clausius-Klapeyron; la importancia de encontrar &Delta;T radica en que bajo esas condiciones de operaci&oacute;n no se presentar&aacute; flujo de calor a trav&eacute;s del sistema (Gostoli, 1999). Cuando las temperaturas son controladas y mantenidas constantes en ambos l&iacute;quidos, la diferencia de temperatura transmembrana &Delta;T est&aacute; dada por la <a href="#ec26y27">ecuaci&oacute;n 27</a>.</p>     <p align="center"><a name="ec26y27"></a><img src="img/revistas/iei/v31n3/v31n3a05ec26y27.JPG"></p>      <p>Para especificar las temperaturas en las interfaces de los l&iacute;quidos y la superficie de la membrana es necesario modificar la <a href="#ec26y27">ecuaci&oacute;n 27</a>, obteni&eacute;ndose dos <a href="#ec28y29">expresiones (28)</a> y <a href="#ec28y29">(29)</a> que permiten calcular dichas temperaturas (Bui <i>et al</i>., 2005b; McCutcheon <i>et al</i>., 2008).</p>     <p align="center"><a name="ec28y29"></a><img src="img/revistas/iei/v31n3/v31n3a05ec28y29.JPG"></p>      ]]></body>
<body><![CDATA[<p><b><i>Coeficientes de transferencia</i></b></p>      <p>El coeficiente de transferencia de calor por conducci&oacute;n (<i>h<sub>m</sub></i>) en una fibra hueca se puede calcular por medio de la <a href="#ec30">expresi&oacute;n (30)</a>, donde la conductividad t&eacute;rmica total de la membrana es una combinaci&oacute;n de la mezcla de gases (aire y agua) que se encuentran en los poros y el pol&iacute;mero del que est&aacute; fabricada.</p>     <p align="center"><a name="ec30"></a><img src="img/revistas/iei/v31n3/v31n3a05ec30.JPG"></p>      <p>El coeficiente de transferencia convectivo (<i>h</i><sub>a</sub>) al interior de membranas huecas puede cuantificarse mediante analog&iacute;a con el flujo dentro de una tuber&iacute;a aplic&aacute;ndose los modelos de Sieder-Tate y Hausen que se definen seg&uacute;n las <a href="#ec31y32">ecuaciones (31)</a> y <a href="#ec31y32">(32)</a>, las cuales hacen uso del n&uacute;mero de Nusselt para el c&aacute;lculo de este par&aacute;metro (Mart&iacute;nez-D&iacute;ez <i>et al</i>., 2000).</p>     <p align="center"><a name="ec31y32"></a><img src="img/revistas/iei/v31n3/v31n3a05ec31y32.JPG"></p>      <p>El c&aacute;lculo del coeficiente (<i>h</i><sub>p</sub>) al exterior de las fibras ha sido poco estudiado para la evaporaci&oacute;n osm&oacute;tica debido a las complejidades geom&eacute;tricas e hidrodin&aacute;micas de los m&oacute;dulos utilizados en esta operaci&oacute;n; algunos autores (Gryta <i>et al., </i>2005) sugieren usar el modelo de Kern (33) que se aplica para intercambiadores de calor de coraza y tubos.</p>     <p align="center"><a name="ec33"></a><img src="img/revistas/iei/v31n3/v31n3a05ec33.JPG"></p>      <p><font size="3"><b>Conclusiones</b></font></p>      <p>La evaporaci&oacute;n osm&oacute;tica tiene m&uacute;ltiples ventajas, donde la m&aacute;s importante es su operaci&oacute;n a bajas temperaturas. Es un proceso sencillo desde el punto de vista t&eacute;cnico, pero altamente complejo en el an&aacute;lisis matem&aacute;tico y f&iacute;sico de los fen&oacute;menos de transferencia que se presentan, con la particularidad de que son de car&aacute;cter simult&aacute;neo. Algunos de los modelos matem&aacute;ticos que se han descrito son generales, pero siempre representan el punto de partida en la b&uacute;squeda de par&aacute;metros m&aacute;s dif&iacute;ciles de cuantificar experimentalmente; ha de tenerse la mesura para saber hasta d&oacute;nde son aplicables los resultados. El material de la membrana, las caracter&iacute;sticas hidrodin&aacute;micas de los m&oacute;dulos y las velocidades de flujo son los par&aacute;metros m&aacute;s determinantes en la magnitud de los coeficientes de transferencia tanto de calor como de masa, siendo una de las &aacute;reas en las que se debe investigar m&aacute;s en futuros trabajos para encontrar modelos espec&iacute;ficos que permitan optimizar y hacer m&aacute;s robusto el proceso frente a la diversidad de materias primas, especialmente cuando se trata de materiales complejos como los alimentos l&iacute;quidos.</p>      <p><font size="3"><b>Nomenclatura</b></font></p>      ]]></body>
<body><![CDATA[<p><i>A&nbsp; &nbsp;  </i>&Aacute;rea (m<sup>-2</sup>)</p>     <p>a&nbsp; &nbsp;  Actividad</p>     <p>C&nbsp; &nbsp; Concentraci&oacute;n molar soluto (mol l<sup>-1</sup>)</p>     <p><i>c<sub>p</sub>&nbsp; &nbsp;</i>Capacidad calor&iacute;fica (J/K)</p>     <p>D&nbsp; &nbsp; Coeficiente de difusi&oacute;n (m<sup>-2</sup> s<sup>-1</sup>)</p>     <p><i>d<sub>h</sub></i>&nbsp; &nbsp;Di&aacute;metro hidr&aacute;ulico (m)</p>     <p><i>d</i>&nbsp; &nbsp; Di&aacute;metro (m)</p>     <p><i>d<sub>p</sub></i>&nbsp; &nbsp;Di&aacute;metro de poro (m)</p>     <p>H&nbsp; &nbsp;Coeficiente total transferencia calor (W m<sup>-2</sup> K<sup>-1</sup>)</p>     <p><i>H<sub>v</sub>&nbsp; &nbsp;</i>Calor de vaporizaci&oacute;n (kJ/kg<sup>-1</sup>)</p>     ]]></body>
<body><![CDATA[<p><i>h</i>&nbsp; &nbsp;Coeficiente transferencia calor (W m<sup>-2</sup> K<sup>-1</sup>)</p>     <p><i>K</i>&nbsp; &nbsp;Coeficiente transferencia masa (kg m<sup>-2</sup> h<sup>-1</sup> Pa<sup>-1</sup>)</p>     <p><i>k</i>&nbsp; &nbsp; Conductividad t&eacute;rmica (W/K.m)</p>     <p><i>k<sub>b</sub></i>&nbsp; &nbsp;Constante de Boltzmann (1,3807x10<sup>-23</sup> J K<sup>-1</sup>)</p>     <p>L&nbsp; &nbsp; Longitud (m)</p>     <p>M&nbsp; &nbsp; Peso molecular (kg mol<sup>-1</sup>)</p>     <p>m&nbsp; &nbsp; Masa (kg)</p>     <p><i>N</i>&nbsp; &nbsp; Flux vapor, masa (kg m<sup>-2</sup> h<sup>-1</sup>), (mol m<sup>-2</sup> s<sup>-1</sup>).</p>     <p><i>P</i>&nbsp; &nbsp; Presi&oacute;n (Pa)</p>     <p><i>P*</i>&nbsp; &nbsp;Presi&oacute;n vapor saturado (Pa)</p>     ]]></body>
<body><![CDATA[<p><i>P<sub>Alm</sub></i> Presi&oacute;n aire media logar&iacute;tmica</p>     <p><i>Q</i>&nbsp; &nbsp; Flux de calor (W m<sup>-2</sup>)</p>     <p><i>R</i>&nbsp; &nbsp; Constante de los gases (8,314J K<sup>-1</sup> mol<sup>-1</sup>)</p>     <p>r&nbsp; &nbsp; Radio de poro (m)</p>     <p><i>T</i>&nbsp; &nbsp;Temperatura (&deg;C, K)</p>     <p><i>X</i>&nbsp; &nbsp;Fracci&oacute;n masa (p/p %)</p>      <p><b><i>Simbolos</i></b></p>     <p>&epsilon;&nbsp; &nbsp; Porosidad</p>     <p>&delta;&nbsp; &nbsp; Espesor (m)</p>     <p>&Delta;&nbsp; &nbsp; Diferencia</p>     ]]></body>
<body><![CDATA[<p><font face="Times New Roman, Times, serif">&gamma;</font>&nbsp; &nbsp; Coeficiente de actividad</p>     <p><font face="Times New Roman, Times, serif"><i>&lambda;</i></font>&nbsp; &nbsp;Trayectoria de media libre (m)</p>      <p><i>&micro;</i>&nbsp; &nbsp; Viscosidad dinamica (Pa s)</p>     <p><i>X</i>&nbsp; &nbsp; Tortuosidad</p>     <p>&infin;&nbsp; &nbsp; Valor asint&oacute;tico</p>     <p>&Oslash;&nbsp; &nbsp; Densidad empaquetamiento</p>     <p><i>&rho;</i>&nbsp; &nbsp; Densidad(kg m<sup>-3</sup>)</p>     <p>&sigma;&nbsp; &nbsp; Diametro medio de colisi&oacute;n</p>     <p><font face="Palatino Linotype, Book Antiqua, Palatino, serif">&nu;</font>&nbsp; &nbsp; Velocidad media (m s<sup>-1</sup>)</p>      <p><b><i>N&uacute;meros adimensionales</i></b></p>      ]]></body>
<body><![CDATA[<p>Gz&nbsp; &nbsp; Graetz</p>     <p>Kn&nbsp; &nbsp; Knudsen</p>     <p>Nu&nbsp; &nbsp; Nusselt</p>     <p>Pr&nbsp; &nbsp; Prandtl</p>     <p>Re&nbsp; &nbsp; Reynolds</p>     <p>Sc&nbsp; &nbsp; Schmidt</p>     <p>Sh&nbsp; &nbsp; Sherwood</p>      <p><b><i>Sub&iacute;ndices</i></b></p>      <p>a&nbsp; &nbsp; Alimentaci&oacute;n</p>     <p><i>i</i> &nbsp; &nbsp; Interno</p>     ]]></body>
<body><![CDATA[<p><i>o</i>&nbsp; &nbsp; Externo</p>     <p>m&nbsp; &nbsp; Membrana</p>     <p>p&nbsp; &nbsp; Permeado</p>     <p>w&nbsp; &nbsp; Agua</p>     <p><i>k</i>&nbsp; &nbsp; Difusi&oacute;n Knudsen</p>     <p><i>M</i>&nbsp; &nbsp; Difusi&oacute;n molecular</p>      <p><i><b>Super&iacute;ndices</b></i></p>      <p><i>k</i>&nbsp; &nbsp;  Difusi&oacute;n Knudsen</p>      <p><i>M</i>&nbsp; &nbsp; Difusi&oacute;n molecular</p>     <p>m&nbsp; &nbsp; Membrana</p>     ]]></body>
<body><![CDATA[<p>&ndash;&nbsp; &nbsp; Promedio</p> <hr>      <p><font size="3"><b>Referencias</b></font></p>      <!-- ref --><p>Alves, V.D.,Coelhoso, I.M., Mass transfer in osmotic evaporation: effect of process parameters., Journal of Membrane Science. Vol. 208, No. 1 -2, 2002, pp. 171-1 79.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000135&pid=S0120-5609201100030000500001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>Alves, V. D.,Coelhoso, I.M., Effect of membrane characteristics on mass and heat transfer in the osmotic evaporation process. Journal of Membrane Science. Vol. 228, No. 2, 2004, pp. 159-167.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000136&pid=S0120-5609201100030000500002&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>Bailey, A.F.G., Barbe, A.M., Hogan, P. A., Johnson, R. A.,Sheng, J., The effect of ultrafiltration on the subsequent concentration of grape juice by osmotic distillation. Journal of Membrane Science. Vol. 164, No. 1 -2, 2000, pp. 195-204.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000137&pid=S0120-5609201100030000500003&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>Bandini, S., Sarti, G.C., Concentration of must through vacuum membrane distillation. Desalination. Vol. 149, No. 1-3, 2002, pp. 253-259.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000138&pid=S0120-5609201100030000500004&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>Bui, A.V., Nguyen, H.M., Joachim, M., Prediction of water activity of glucose and calcium chloride solutions. Journal of Food Engineering. Vol. 57, No. 3, 2003, pp. 243-248.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=000139&pid=S0120-5609201100030000500005&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><p>Bui, V.A., Nguyen, M.H., Muller, J., A laboratory study on glucose concentration by osmotic distillation in hollow fibre module. 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<article-title xml:lang="en"><![CDATA[Mass transfer in osmotic evaporation: effect of process parameters]]></article-title>
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<year>2002</year>
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