{"id":39981,"date":"2019-09-17T07:34:36","date_gmt":"2019-09-17T06:34:36","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/que-es-externo-vs-interno-numero-de-nusselt-definicion\/"},"modified":"2020-01-06T21:26:51","modified_gmt":"2020-01-06T20:26:51","slug":"que-es-externo-vs-interno-numero-de-nusselt-definicion","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/es\/que-es-externo-vs-interno-numero-de-nusselt-definicion\/","title":{"rendered":"Qu\u00e9 es externo vs interno &#8211; N\u00famero de Nusselt &#8211; Definici\u00f3n"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Externo vs interno &#8211; N\u00famero de Nusselt &#8211; C\u00e1lculo del coeficiente de transferencia de calor por convecci\u00f3n.\u00a0Desde este punto de vista, distinguimos: flujo interno, flujo externo.\u00a0Ingenieria termal<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Clasificaci\u00f3n de los reg\u00edmenes de flujo<\/h2>\n<p>El\u00a0<a title=\"R\u00e9gimen de flujo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/flow-regime\/\"><strong>r\u00e9gimen de flujo<\/strong><\/a>\u00a0tambi\u00e9n se puede clasificar de acuerdo con la\u00a0\u00a0<strong>geometr\u00eda de un conducto<\/strong>\u00a0\u00a0o \u00e1rea de flujo.\u00a0Desde este punto de vista, distinguimos:<\/p>\n<ul>\n<li><a title=\"Flujo interno\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/internal-flow\/\"><strong>Flujo interno<\/strong><\/a><\/li>\n<li><a title=\"Flujo externo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/external-flow\/\"><strong>Flujo externo<\/strong><\/a><\/li>\n<\/ul>\n<p><strong>El flujo interno<\/strong>\u00a0\u00a0es un flujo para el cual el fluido est\u00e1 confinado por una superficie.\u00a0El conocimiento detallado del comportamiento de los reg\u00edmenes de flujo interno es\u00a0\u00a0<strong>importante en ingenier\u00eda<\/strong>\u00a0, ya que las tuber\u00edas circulares pueden soportar altas presiones y, por lo tanto, se utilizan para transportar l\u00edquidos.\u00a0Por otro lado,\u00a0\u00a0<strong>el flujo externo<\/strong>\u00a0\u00a0es un flujo en el que las capas l\u00edmite se desarrollan libremente, sin restricciones impuestas por las superficies adyacentes.\u00a0El conocimiento detallado del comportamiento de\u00a0\u00a0<strong>los<\/strong>\u00a0\u00a0reg\u00edmenes de\u00a0<strong>flujo externo<\/strong>\u00a0es\u00a0\u00a0<strong>importante especialmente en aeron\u00e1utica<\/strong>\u00a0\u00a0y\u00a0\u00a0<strong>aerodin\u00e1mica<\/strong>\u00a0.<\/p>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<h2><span>Flujo externo<\/span><\/h2>\n<p><span>En\u00a0<\/span><a title=\"Din\u00e1mica de fluidos\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/\"><span>la din\u00e1mica de fluidos<\/span><\/a><span>\u00a0,\u00a0\u00a0<\/span><a title=\"Flujo externo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/external-flow\/\"><strong><span>el flujo externo<\/span><\/strong><\/a><span>\u00a0\u00a0es un flujo en el que\u00a0\u00a0<\/span><a title=\"Capa l\u00edmite\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-la-capa-limite-definicion\/\"><strong><span>las capas l\u00edmite se<\/span><\/strong><\/a><span>\u00a0\u00a0desarrollan libremente, sin restricciones impuestas por\u00a0\u00a0<\/span><strong><span>las superficies adyacentes<\/span><\/strong><span>\u00a0.\u00a0En comparaci\u00f3n con el flujo interno, los flujos externos presentan\u00a0\u00a0<\/span><strong><span>efectos altamente viscosos<\/span><\/strong><span>\u00a0\u00a0confinados a &#8221;\u00a0<\/span><strong><span>capas l\u00edmite<\/span><\/strong><span>\u00a0&#8221; de r\u00e1pido crecimiento\u00a0en la regi\u00f3n de entrada, o a capas de cizallamiento delgadas a lo largo de la superficie s\u00f3lida.\u00a0En consecuencia, siempre existir\u00e1 una regi\u00f3n del flujo fuera de la capa l\u00edmite.\u00a0En esta regi\u00f3n, la velocidad, la temperatura y \/ o la concentraci\u00f3n no cambian y sus gradientes pueden descuidarse.<\/span><\/p>\n<p><span>Este efecto hace que la\u00a0\u00a0<\/span><strong><span>capa l\u00edmite<\/span><\/strong><span>\u00a0\u00a0se expanda y el grosor de la capa l\u00edmite se relaciona con la viscosidad cinem\u00e1tica del fluido.<\/span><\/p>\n<p><span>Esto se demuestra en la siguiente imagen.\u00a0Lejos del cuerpo, el flujo es casi invisible, se puede definir como el flujo de un fluido alrededor de un cuerpo que est\u00e1 completamente sumergido en \u00e9l.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boundary-layer-on-flat-plate.png?d484e7\"><img loading=\"lazy\" class=\"aligncenter size-large wp-image-14390 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boundary-layer-on-flat-plate-1024x357.png?d484e7\" alt=\"Capa l\u00edmite en placa plana\" width=\"669\" height=\"233\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boundary-layer-on-flat-plate-1024x357.png?d484e7\" \/><\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Flujo externo: placa plana<\/span><\/h2>\n<p><span>El\u00a0<\/span><a title=\"\u00bfQu\u00e9 es el n\u00famero de Nusselt?\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/characteristic-numbers\/what-is-nusselt-number\/\"><strong><span>n\u00famero<\/span><\/strong>\u00a0<\/a><span>promedio de\u00a0<a title=\"\u00bfQu\u00e9 es el n\u00famero de Nusselt?\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/characteristic-numbers\/what-is-nusselt-number\/\"><strong>Nusselt<\/strong><\/a>\u00a0en toda la placa est\u00e1 determinado por:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/laminar-flow-flat-plate-nusselt-number.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20504 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/laminar-flow-flat-plate-nusselt-number.png\" alt=\"flujo laminar - placa plana - n\u00famero nusselt\" width=\"626\" height=\"235\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/laminar-flow-flat-plate-nusselt-number.png\" \/><\/a><\/p>\n<p><span>Esta relaci\u00f3n da el\u00a0<\/span><strong><a title=\"Coeficiente de transferencia de calor convectivo\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-el-coeficiente-de-transferencia-de-calor-por-conveccion-definicion\/\"><span>coeficiente<\/span><\/a><\/strong><span>\u00a0promedio de\u00a0<strong><a title=\"Coeficiente de transferencia de calor convectivo\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-el-coeficiente-de-transferencia-de-calor-por-conveccion-definicion\/\">transferencia de calor<\/a><\/strong>\u00a0para toda la placa cuando el flujo es\u00a0<\/span><a title=\"Flujo Laminar - Flujo Viscoso\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-el-flujo-laminar-flujo-viscoso-definicion\/\"><span>laminar<\/span><\/a><span>\u00a0sobre toda la placa.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/turbulent-flow-flat-plate-nusselt-number.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20505 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/turbulent-flow-flat-plate-nusselt-number.png\" alt=\"flujo turbulento - placa plana - n\u00famero nusselt\" width=\"565\" height=\"243\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/turbulent-flow-flat-plate-nusselt-number.png\" \/><\/a><\/p>\n<p><span>Esta relaci\u00f3n da el\u00a0<\/span><a title=\"Coeficiente de transferencia de calor convectivo\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-el-coeficiente-de-transferencia-de-calor-por-conveccion-definicion\/\"><strong><span>coeficiente de transferencia de calor<\/span><\/strong><\/a><span>\u00a0promedio\u00a0para toda la placa solo cuando el flujo es\u00a0<\/span><a title=\"Flujo turbulento\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-el-flujo-turbulento-definicion\/\"><strong><span>turbulento<\/span><\/strong>\u00a0<\/a><span>sobre toda la placa, o cuando la\u00a0regi\u00f3n de\u00a0<\/span><a title=\"Flujo Laminar - Flujo Viscoso\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-el-flujo-laminar-flujo-viscoso-definicion\/\"><span>flujo laminar<\/span><\/a><span>\u00a0de la placa es demasiado peque\u00f1a en relaci\u00f3n con la regi\u00f3n de flujo turbulento.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Flujo interno<\/span><\/h2>\n<figure id=\"attachment_14394\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-14394\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Internal-Flow.png\"><img loading=\"lazy\" class=\"size-medium wp-image-14394 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Internal-Flow-300x269.png\" alt=\"Flujo interno\" width=\"300\" height=\"269\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Internal-Flow-300x269.png\" \/><\/a><figcaption id=\"caption-attachment-14394\" class=\"wp-caption-text\"><span>Fuente: White Frank M., Fluid Mechanics, McGraw-Hill Education, 7\u00aa edici\u00f3n, febrero de 2010, ISBN: 978-0077422417<\/span><\/figcaption><\/figure>\n<p><span>En\u00a0<\/span><a title=\"Din\u00e1mica de fluidos\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/\"><span>la din\u00e1mica de fluidos<\/span><\/a><span>\u00a0,\u00a0<\/span><a title=\"Flujo interno\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/internal-flow\/\"><strong><span>el flujo interno<\/span><\/strong><\/a><span>\u00a0es un flujo para el cual el fluido est\u00e1\u00a0\u00a0<\/span><strong><span>confinado por una superficie<\/span><\/strong><span>\u00a0.\u00a0El conocimiento detallado del comportamiento de los reg\u00edmenes de flujo interno es importante en ingenier\u00eda, ya que las tuber\u00edas circulares pueden soportar altas presiones y, por lo tanto, se utilizan para transportar l\u00edquidos.\u00a0Los conductos no circulares se utilizan para transportar gases a baja presi\u00f3n, como el aire en los sistemas de refrigeraci\u00f3n y calefacci\u00f3n.\u00a0La configuraci\u00f3n de flujo interno es una geometr\u00eda conveniente para calentar y enfriar fluidos utilizados en tecnolog\u00edas de conversi\u00f3n de energ\u00eda como\u00a0\u00a0<\/span><a title=\"Planta de energ\u00eda nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/\"><span>las plantas de energ\u00eda nuclear<\/span><\/a><span>\u00a0.<\/span><\/p>\n<p><span>Para\u00a0\u00a0<\/span><a title=\"Flujo interno\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/internal-flow\/\"><span>el r\u00e9gimen de flujo interno,<\/span><\/a><span>\u00a0\u00a0una\u00a0\u00a0<\/span><strong><span>regi\u00f3n de entrada<\/span><\/strong><span>\u00a0\u00a0es t\u00edpica.\u00a0En esta regi\u00f3n, un flujo ascendente casi invisible se converge y entra al tubo.\u00a0Para caracterizar esta regi\u00f3n,\u00a0\u00a0\u00a0se introduce la\u00a0<\/span><strong><span>longitud de entrada hidrodin\u00e1mica<\/span><\/strong><span>\u00a0y es aproximadamente igual a:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/hydrodynamic-entrance-length.png?d484e7\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14416 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/hydrodynamic-entrance-length.png?d484e7\" alt=\"longitud de entrada hidrodin\u00e1mica\" width=\"365\" height=\"69\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/hydrodynamic-entrance-length.png?d484e7\" \/><\/a><\/p>\n<p><span>La longitud m\u00e1xima de entrada hidrodin\u00e1mica, en\u00a0\u00a0<\/span><strong><span>Re\u00a0<\/span><sub><span>D, crit<\/span><\/sub><span>\u00a0\u00a0= 2300<\/span><\/strong><span>\u00a0\u00a0(\u00a0<\/span><strong><span>flujo laminar<\/span><\/strong><span>\u00a0), es L\u00a0<\/span><sub><span>e<\/span><\/sub><span>\u00a0\u00a0= 138d, donde D es el di\u00e1metro de la tuber\u00eda.\u00a0Esta es la mayor longitud de desarrollo posible.\u00a0En\u00a0\u00a0<\/span><strong><span>flujo turbulento<\/span><\/strong><span>\u00a0, las capas l\u00edmite crecen m\u00e1s r\u00e1pido, y L\u00a0<\/span><sub><span>e<\/span><\/sub><span>\u00a0\u00a0es relativamente m\u00e1s corto.\u00a0Para cualquier problema,\u00a0\u00a0\u00a0se debe\u00a0\u00a0<strong>verificar\u00a0<\/strong><\/span><strong><span>L\u00a0<\/span><sub><span>e<\/span><\/sub><span>\u00a0\u00a0\/ D<\/span><\/strong><span>\u00a0\u00a0para ver si L\u00a0<sub>e<\/sub>\u00a0\u00a0es insignificante en comparaci\u00f3n con la longitud de la tuber\u00eda.\u00a0A una distancia finita de la entrada, los efectos de entrada pueden descuidarse, porque las capas l\u00edmite se fusionan y el n\u00facleo invisible desaparece.\u00a0El flujo del tubo se\u00a0\u00a0<strong>desarrolla completamente<\/strong>\u00a0.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Flujo laminar interno &#8211; N\u00famero de Nusselt<\/span><\/h2>\n<p><strong><span>Temperatura de superficie constante<\/span><\/strong><\/p>\n<p><span>En\u00a0<\/span><a title=\"Flujo Laminar - Flujo Viscoso\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-el-flujo-laminar-flujo-viscoso-definicion\/\"><strong><span>el flujo laminar<\/span><\/strong><\/a><span>\u00a0en un tubo con temperatura de superficie constante, tanto el factor de fricci\u00f3n como el\u00a0<\/span><a title=\"Coeficiente de transferencia de calor convectivo\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-el-coeficiente-de-transferencia-de-calor-por-conveccion-definicion\/\"><strong><span>coeficiente de transferencia de calor<\/span><\/strong><\/a><span>\u00a0permanecen constantes en la regi\u00f3n completamente desarrollada.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Laminar-Flow-Circular-Tube-temperature.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20508 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Laminar-Flow-Circular-Tube-temperature.png\" alt=\"Flujo Laminar - Tubo Circular - temperatura\" width=\"560\" height=\"187\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Laminar-Flow-Circular-Tube-temperature.png\" \/><\/a><\/p>\n<p><strong><span>Flujo de calor de superficie constante<\/span><\/strong><\/p>\n<p><span>Por lo tanto, para un\u00a0<\/span><strong><span>flujo laminar<\/span><\/strong><span>\u00a0completamente desarrollado\u00a0en un tubo circular sometido a un\u00a0<\/span><a title=\"Densidad de flujo de calor - Flujo t\u00e9rmico\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/heat-flux-density-thermal-flux\/\"><span>flujo de calor<\/span><\/a><span>\u00a0superficial constante\u00a0, el n\u00famero de Nusselt es una constante.\u00a0No hay dependencia de los\u00a0<a title=\"\u00bfQu\u00e9 es el n\u00famero de Prandtl?\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/characteristic-numbers\/what-is-prandtl-number\/\">n\u00fameros de\u00a0<\/a><\/span><a title=\"Numero Reynolds\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/reynolds-number\/\"><span>Reynolds<\/span><\/a><span>\u00a0o\u00a0<\/span><a title=\"\u00bfQu\u00e9 es el n\u00famero de Prandtl?\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/characteristic-numbers\/what-is-prandtl-number\/\"><span>Prandtl<\/span><\/a><span>\u00a0.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Laminar-Flow-Circular-Tube-flux.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20507 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Laminar-Flow-Circular-Tube-flux.png\" alt=\"Flujo Laminar - Tubo Circular - flujo\" width=\"532\" height=\"191\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Laminar-Flow-Circular-Tube-flux.png\" \/><\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Flujo turbulento interno: n\u00famero de Nusselt<\/span><\/h2>\n<p><span>Ver tambi\u00e9n:\u00a0<\/span><a title=\"Ecuaci\u00f3n Dittus-Boelter\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/convection-convective-heat-transfer\/dittus-boelter-equation\/\"><span>ecuaci\u00f3n de Dittus-Boelter<\/span><\/a><\/p>\n<p><span>Para\u00a0<\/span><a title=\"Flujo turbulento\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-el-flujo-turbulento-definicion\/\"><span>un flujo turbulento<\/span><\/a><span>\u00a0completamente desarrollado (hidrodin\u00e1micamente y t\u00e9rmicamente)\u00a0\u00a0\u00a0en un tubo circular liso, el\u00a0<\/span><a title=\"\u00bfQu\u00e9 es el n\u00famero de Nusselt?\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/characteristic-numbers\/what-is-nusselt-number\/\"><span>n\u00famero<\/span><\/a><span>\u00a0local de\u00a0\u00a0<a title=\"\u00bfQu\u00e9 es el n\u00famero de Nusselt?\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/characteristic-numbers\/what-is-nusselt-number\/\">Nusselt<\/a>\u00a0\u00a0puede obtenerse de la conocida\u00a0\u00a0<\/span><strong><span>ecuaci\u00f3n Dittus-Boelter<\/span><\/strong><span>\u00a0.\u00a0La\u00a0\u00a0<\/span><strong><span>ecuaci\u00f3n Dittus\u00ae Boelter<\/span><\/strong><span>\u00a0\u00a0es f\u00e1cil de resolver, pero es menos precisa cuando hay una gran diferencia de temperatura en el\u00a0\u00a0<\/span><a title=\"Din\u00e1mica de fluidos\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/\"><span>fluido<\/span><\/a><span>\u00a0\u00a0y es menos precisa para tubos rugosos (muchas aplicaciones comerciales), ya que est\u00e1 dise\u00f1ada para tubos lisos.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Dittus-Boelter-Equation-Formula.png?d484e7\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20409 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Dittus-Boelter-Equation-Formula.png?d484e7\" alt=\"Ecuaci\u00f3n Dittus-Boelter - F\u00f3rmula\" width=\"556\" height=\"278\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Dittus-Boelter-Equation-Formula.png?d484e7\" \/><\/a><\/p>\n<p><span>La\u00a0\u00a0<\/span><a title=\"Ecuaci\u00f3n Dittus-Boelter\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/convection-convective-heat-transfer\/dittus-boelter-equation\/\"><strong><span>correlaci\u00f3n Dittus-Boelter<\/span><\/strong><\/a><span>\u00a0\u00a0puede usarse para diferencias de temperatura peque\u00f1as a moderadas, T\u00a0<\/span><sub><span>wall<\/span><\/sub><span>\u00a0\u00a0&#8211; T\u00a0<\/span><sub><span>avg<\/span><\/sub><span>\u00a0, con todas las propiedades evaluadas a una temperatura\u00a0<\/span><sub><span>promedio<\/span><\/sub><span>\u00a0T\u00a0<sub>avg<\/sub>\u00a0.<\/span><\/p>\n<p><span>Para flujos caracterizados por grandes variaciones de propiedades, las correcciones (por ejemplo, un factor de correcci\u00f3n de la viscosidad\u00a0\u00a0<\/span><strong><span>\u03bc \/ \u03bc\u00a0<\/span><\/strong><strong><sub><span>wall<\/span><\/sub><\/strong><span>\u00a0) deben tenerse en cuenta, por ejemplo, como\u00a0recomiendan\u00a0<\/span><a title=\"Ecuaci\u00f3n de Sieder-Tate\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/convection-convective-heat-transfer\/sieder-tate-equation\/\"><span>Sieder y Tate<\/span><\/a><span>\u00a0.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights  lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>C\u00e1lculo del n\u00famero de Nusselt usando la ecuaci\u00f3n de Dittus-Boelter<\/span><\/h2>\n<p><span>Para un flujo turbulento completamente desarrollado (hidrodin\u00e1micamente y t\u00e9rmicamente) en un tubo circular liso, el\u00a0<\/span><strong><span>n\u00famero<\/span><\/strong><span>\u00a0local de\u00a0<strong>Nusselt<\/strong>\u00a0se puede obtener de la conocida\u00a0<\/span><strong><span>ecuaci\u00f3n Dittus ?? Boelter<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>Para calcular el\u00a0<\/span><strong><span>n\u00famero de Nusselt<\/span><\/strong><span>\u00a0, tenemos que saber:<\/span><\/p>\n<ul>\n<li><span>el\u00a0<\/span><a title=\"Numero Reynolds\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/reynolds-number\/\"><span>n\u00famero de Reynolds<\/span><\/a><span>\u00a0, que es\u00a0<\/span><strong><span>Re\u00a0<\/span><sub><span>Dh<\/span><\/sub><span>\u00a0= 575600<\/span><\/strong><\/li>\n<li><span>el\u00a0<\/span><a title=\"\u00bfQu\u00e9 es el n\u00famero de Prandtl?\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/introduction-to-heat-transfer\/characteristic-numbers\/what-is-prandtl-number\/\"><span>n\u00famero de Prandtl<\/span><\/a><span>\u00a0, que es\u00a0<\/span><strong><span>Pr = 0.89<\/span><\/strong><\/li>\n<\/ul>\n<p><span>El\u00a0<\/span><strong><span>n\u00famero de Nusselt<\/span><\/strong><span>\u00a0para la convecci\u00f3n forzada dentro del canal de combustible es igual a:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/nusselt-number-example.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20413 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/nusselt-number-example.png\" alt=\"n\u00famero nusselt - ejemplo\" width=\"387\" height=\"58\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/nusselt-number-example.png\" \/><\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-100 lgc-tablet-grid-100 lgc-mobile-grid-100 lgc-equal-heights lgc-first lgc-last\">\n<div class=\"inside-grid-column\">\n<div class=\"su-accordion\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-plus su-spoiler-closed\">\n<div class=\"su-spoiler-content su-clearfix\">\n<p>&nbsp;<\/p>\n<\/div>\n<\/div>\n<p>&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;&#8230;.<\/p>\n<p>Este art\u00edculo se basa en la traducci\u00f3n autom\u00e1tica del art\u00edculo original en ingl\u00e9s. Para m\u00e1s informaci\u00f3n vea el art\u00edculo en ingl\u00e9s. Puedes ayudarnos. Si desea corregir la traducci\u00f3n, env\u00edela a: translations@nuclear-power.com o complete el formulario de traducci\u00f3n en l\u00ednea. Agradecemos su ayuda, actualizaremos la traducci\u00f3n lo antes posible. Gracias.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Externo vs interno &#8211; N\u00famero de Nusselt &#8211; C\u00e1lculo del coeficiente de transferencia de calor por convecci\u00f3n.\u00a0Desde este punto de vista, distinguimos: flujo interno, flujo externo.\u00a0Ingenieria termal Clasificaci\u00f3n de los reg\u00edmenes de flujo El\u00a0r\u00e9gimen de flujo\u00a0tambi\u00e9n se puede clasificar de acuerdo con la\u00a0\u00a0geometr\u00eda de un conducto\u00a0\u00a0o \u00e1rea de flujo.\u00a0Desde este punto de vista, distinguimos: Flujo &#8230; <a title=\"Qu\u00e9 es externo vs interno &#8211; N\u00famero de Nusselt &#8211; Definici\u00f3n\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/es\/que-es-externo-vs-interno-numero-de-nusselt-definicion\/\" aria-label=\"M\u00e1s en Qu\u00e9 es externo vs interno &#8211; N\u00famero de Nusselt &#8211; Definici\u00f3n\">Leer m\u00e1s<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[16],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Qu\u00e9 es externo vs interno - N\u00famero de Nusselt - Definici\u00f3n<\/title>\n<meta name=\"description\" content=\"Externo vs interno - N\u00famero de Nusselt - C\u00e1lculo del coeficiente de transferencia de calor por convecci\u00f3n. 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