<?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>0121-1129</journal-id>
<journal-title><![CDATA[Revista Facultad de Ingeniería]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. Fac. ing.]]></abbrev-journal-title>
<issn>0121-1129</issn>
<publisher>
<publisher-name><![CDATA[Universidad Pedagógica y Tecnológica de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-11292018000100031</article-id>
<article-id pub-id-type="doi">10.19053/01211129.v27.n47.2018.7749</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Thermal transfer analysis of tubes with extended surface with fractal design]]></article-title>
<article-title xml:lang="es"><![CDATA[Análisis de transferencia térmico de tubos con superficies extendidas con diseño fractal]]></article-title>
<article-title xml:lang="pt"><![CDATA[Análise de transferência térmica de tubos com superfícies estendidas com desenho fractal]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Llano-Sánchez]]></surname>
<given-names><![CDATA[Luis Eduardo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Domínguez-Cajeli]]></surname>
<given-names><![CDATA[Darío Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ruiz-Cárdenas]]></surname>
<given-names><![CDATA[Luis Carlos]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Militar Nueva Granada  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Militar Nueva Granada  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af3">
<institution><![CDATA[,Universidad Militar Nueva Granada  ]]></institution>
<addr-line><![CDATA[Bogotá ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>04</month>
<year>2018</year>
</pub-date>
<volume>27</volume>
<numero>47</numero>
<fpage>31</fpage>
<lpage>37</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-11292018000100031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-11292018000100031&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-11292018000100031&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Heat exchangers are formed by tubes with extended surfaces that improve the transfer of heat between two media (e.g., a solid and a liquid in motion). This paper presents the design of an extended surface tube with fractal geometry, corresponding to the Koch snowflake and the Cesaro curve. For the design, we used the CAD computational tool, and afterwards we performed the CAE finite element analysis and verified the thermal behavior of the designed tube. We were able to reduce the heat transfer time and increase the heat flow in the system in the following manner: for smooth tube, 250 W/m2; for Koch surface, 500 W/m2; for six fins, 1450 W/ m2; and for Cesaro curve, 3600 W/m2. These results demonstrate the limits of the design and the advantages of its implementation in machinery such as condensers, heat exchangers, and boilers.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Los intercambiadores de calor están conformados por tubos con superficies extendidas, con el propósito de mejorar la transferencia de calor entre dos medios, que pueden ser un sólido y un líquido en movimiento. En el presente trabajo se expone el diseño que se llevó a cabo de un tubo de superficie extendida con geometría fractal, correspondiente al copo de Koch y la curva de Cesaro, con la herramienta computacional CAD, para luego realizar el análisis por elementos finitos CAE y verificar el comportamiento térmico del tubo diseñado. Se logró obtener como resultado reducir el tiempo de transferencia de calor y aumentar el flujo de calor en el sistema del modo siguiente: para tubo liso, 250 W/m2; para superficie de Koch, 500 W/m2; para seis aletas, 1450 W/m2, y, finalmente, para curva de Cesaro, 3600 W/m2. Todo ello, permitió evidenciar los límites del diseño y las ventajas que pueden llegar a tener respecto a su implementación en maquinarias como condensadores, intercambiadores de calor y calderas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="pt"><p><![CDATA[Resumo Os permutadores de calor estão conformados por tubos com superfícies estendidas, com o propósito de melhorar a transferência de calor entre dois meios, que podem ser um sólido e um líquido em movimento. No presente trabalho expõe-se o desenho que se realizou de um tubo de superfície estendida com geometria fractal, correspondente ao floco de Koch e a curva de Cesaro, com a ferramenta computacional CAD, para logo realizar a análise por elementos finitos CAE e verificar o comportamento térmico do tubo desenhado. Logrou-se obter como resultado reduzir o tempo de transferência de calor e aumentar o fluxo de calor no sistema da seguinte maneira: para tubo liso, 250 W/m2; para superfície de Koch, 500 W/m2; para seis aletas, 1450 W/m2, e, finalmente, para curva de Cesaro, 3600 W/m2. Tudo isto, permitiu evidenciar os limites do desenho e as vantagens que podem chegar a ter em relação a sua implementação em maquinarias como condensadores, permutadores de calor e caldeiras.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[boilers]]></kwd>
<kwd lng="en"><![CDATA[Cesaro curve]]></kwd>
<kwd lng="en"><![CDATA[finite elements]]></kwd>
<kwd lng="en"><![CDATA[fractal design]]></kwd>
<kwd lng="en"><![CDATA[heat transfer]]></kwd>
<kwd lng="en"><![CDATA[Koch Snowflake]]></kwd>
<kwd lng="en"><![CDATA[tubes with extended surface]]></kwd>
<kwd lng="es"><![CDATA[calderas]]></kwd>
<kwd lng="es"><![CDATA[copo de Koch]]></kwd>
<kwd lng="es"><![CDATA[curva de Cesaro]]></kwd>
<kwd lng="es"><![CDATA[diseño fractal]]></kwd>
<kwd lng="es"><![CDATA[elementos finitos]]></kwd>
<kwd lng="es"><![CDATA[transferencia de calor]]></kwd>
<kwd lng="es"><![CDATA[tubos de superficie extendida]]></kwd>
<kwd lng="pt"><![CDATA[caldeiras]]></kwd>
<kwd lng="pt"><![CDATA[floco de Koch]]></kwd>
<kwd lng="pt"><![CDATA[curva de Cesaro]]></kwd>
<kwd lng="pt"><![CDATA[desenho fractal]]></kwd>
<kwd lng="pt"><![CDATA[elementos finitos]]></kwd>
<kwd lng="pt"><![CDATA[transferência de calor]]></kwd>
<kwd lng="pt"><![CDATA[tubos de superfície estendida]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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