{"id":47743,"date":"2019-11-06T04:38:17","date_gmt":"2019-11-06T03:38:17","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-densidade-de-fluxo-de-calor-fluxo-termico-definicao\/"},"modified":"2020-01-24T17:48:43","modified_gmt":"2020-01-24T16:48:43","slug":"o-que-e-densidade-de-fluxo-de-calor-fluxo-termico-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-densidade-de-fluxo-de-calor-fluxo-termico-definicao\/","title":{"rendered":"O que \u00e9 densidade de fluxo de calor &#8211; Fluxo t\u00e9rmico &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">A taxa de transfer\u00eancia de calor por unidade de \u00e1rea normal \u00e0 dire\u00e7\u00e3o da transfer\u00eancia de calor \u00e9 chamada fluxo de calor.\u00a0\u00c0s vezes, tamb\u00e9m \u00e9 chamado de densidade do fluxo de calor.\u00a0Engenharia T\u00e9rmica<\/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>Densidade do fluxo de calor &#8211; Fluxo t\u00e9rmico<\/h2>\n<p>A\u00a0<strong>taxa de transfer\u00eancia de calor<\/strong>\u00a0por unidade de \u00e1rea normal \u00e0 dire\u00e7\u00e3o da transfer\u00eancia de calor \u00e9 chamada\u00a0<strong>fluxo de calor<\/strong>\u00a0.\u00a0\u00c0s vezes, tamb\u00e9m \u00e9 chamado de\u00a0<strong>densidade do fluxo de calor<\/strong>\u00a0.\u00a0No SI, suas unidades s\u00e3o watts por metro quadrado (Wm\u00a0<sup>\u22122<\/sup>\u00a0).\u00a0Ele tem uma dire\u00e7\u00e3o e uma magnitude e, portanto, \u00e9 uma quantidade vetorial.\u00a0O fluxo m\u00e9dio de calor \u00e9 expresso como:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-flux-density-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20016 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-flux-density-equation.png\" alt=\"densidade do fluxo de calor - equa\u00e7\u00e3o\" width=\"160\" height=\"60\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/heat-flux-density-equation.png\" \/><\/a><\/p>\n<p>onde A \u00e9 a \u00e1rea de transfer\u00eancia de calor.\u00a0A unidade de fluxo de calor em unidades inglesas \u00e9 Btu \/ h \u00b7 ft\u00a0<sup>2<\/sup>\u00a0.\u00a0Observe que o fluxo de calor pode variar com o tempo e com a posi\u00e7\u00e3o na superf\u00edcie.<\/p>\n<p>Nos\u00a0<a title=\"Reator nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/\">reatores nucleares<\/a>\u00a0, as limita\u00e7\u00f5es do\u00a0<strong>fluxo de calor local<\/strong>\u00a0s\u00e3o da maior import\u00e2ncia para a seguran\u00e7a do reator.\u00a0Como o combust\u00edvel nuclear consiste em barras de combust\u00edvel, o fluxo de calor \u00e9 definido em unidades de W \/ cm (fluxo de calor linear local) ou kW \/ haste (pot\u00eancia por barra de combust\u00edvel).<\/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-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\"><\/div>\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=\"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>Medi\u00e7\u00e3o de fluxo de calor<\/span><\/h2>\n<p><span>A medi\u00e7\u00e3o do\u00a0<\/span><strong><span>fluxo<\/span><\/strong><span>\u00a0de\u00a0<strong>calor<\/strong>\u00a0pode ser realizada de algumas maneiras diferentes.<\/span><\/p>\n<ul>\n<li><strong><span>Medi\u00e7\u00e3o com base na diferen\u00e7a de temperatura<\/span><\/strong><span>\u00a0.\u00a0Um m\u00e9todo geralmente conhecido, mas muitas vezes impratic\u00e1vel, \u00e9 realizado medindo uma diferen\u00e7a de temperatura em um peda\u00e7o de material com\u00a0<\/span><strong><span>condutividade t\u00e9rmica<\/span><\/strong><span>\u00a0conhecida\u00a0.\u00a0Este m\u00e9todo pressup\u00f5e que a condutividade t\u00e9rmica do material seja bem conhecida.\u00a0Este m\u00e9todo \u00e9 an\u00e1logo a uma maneira padr\u00e3o de medir uma corrente el\u00e9trica, onde se mede a queda de tens\u00e3o em um resistor conhecido.<\/span><\/li>\n<li><strong><span>Medi\u00e7\u00e3o baseada no uso do sensor de fluxo de calor<\/span><\/strong><span>\u00a0.\u00a0O fluxo de calor pode ser medido diretamente atrav\u00e9s de\u00a0<\/span><strong><span>sensores<\/span><\/strong><span>\u00a0ou transdutores de fluxo de calor.\u00a0O tipo mais comum de sensor de fluxo de calor \u00e9 uma termopilha de temperatura diferencial que opera essencialmente com o mesmo princ\u00edpio do primeiro m\u00e9todo de medi\u00e7\u00e3o.\u00a0Um sensor de fluxo de calor deve medir a densidade local do fluxo de calor em uma dire\u00e7\u00e3o.\u00a0O resultado \u00e9 expresso em watts por metro quadrado.\u00a0Essa medi\u00e7\u00e3o tem a vantagem de que a condutividade t\u00e9rmica n\u00e3o precisa ser um par\u00e2metro conhecido.<\/span><\/li>\n<\/ul>\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>Exemplo &#8211; Fluxo de calor atrav\u00e9s de uma janela<\/span><\/h2>\n<p><strong><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Example-Heat-Flux-Thermal-Conduction.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-20047 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Example-Heat-Flux-Thermal-Conduction-300x280.png\" alt=\"Exemplo - Fluxo de Calor - Condu\u00e7\u00e3o T\u00e9rmica\" width=\"300\" height=\"280\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Example-Heat-Flux-Thermal-Conduction-300x280.png\" \/><\/a><span>Perda de calor atrav\u00e9s das janelas<\/span><\/strong><\/p>\n<p><span>Uma das principais fontes de perda de calor de uma casa \u00e9 atrav\u00e9s das janelas.\u00a0Calcule a taxa de fluxo de calor atrav\u00e9s de uma janela de vidro com 1,5 mx\u00a0<\/span><strong>\u00a0<\/strong><span>1,0 m de \u00e1rea e 3,0 mm de espessura, se as temperaturas nas superf\u00edcies interna e externa forem de 14,0 \u00b0 C e 13,0 \u00b0 C, respectivamente.\u00a0Calcule o fluxo de calor atrav\u00e9s desta janela.<\/span><\/p>\n<p><strong><span>Solu\u00e7\u00e3o:<\/span><\/strong><\/p>\n<p><span>Neste ponto, conhecemos as temperaturas nas superf\u00edcies do material.\u00a0Essas temperaturas s\u00e3o dadas tamb\u00e9m pelas condi\u00e7\u00f5es dentro e fora da casa.\u00a0Nesse caso, o calor flui por condu\u00e7\u00e3o atrav\u00e9s do vidro da temperatura interna mais alta para a temperatura externa mais baixa.\u00a0Usamos a equa\u00e7\u00e3o de condu\u00e7\u00e3o de calor:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Heat-loss-through-window-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20027 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Heat-loss-through-window-equation.png\" alt=\"Perda de calor atrav\u00e9s da janela - equa\u00e7\u00e3o\" width=\"259\" height=\"145\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Heat-loss-through-window-equation.png\" \/><\/a><\/p>\n<p><span>Assumimos que a condutividade t\u00e9rmica de um vidro comum \u00e9 k = 0,96 W \/ mK<\/span><\/p>\n<p><span>O fluxo de calor ser\u00e1 ent\u00e3o:<\/span><\/p>\n<p><span>q = 0,96 [W \/ mK] x 1 [K] \/ 3,0 x 10\u00a0<\/span><sup><span>-3<\/span><\/sup><span>\u00a0\u00a0[m] = 320 W \/ m\u00a0<\/span><sup><span>2<\/span><\/sup><\/p>\n<p><span>A perda total de calor atrav\u00e9s desta janela ser\u00e1:<\/span><\/p>\n<p><span>q\u00a0<\/span><sub><span>perda<\/span><\/sub><span>\u00a0\u00a0= q.\u00a0A = 320 x 1,5 x 1,0 = 480W<\/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>Fluxo cr\u00edtico de calor<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Dryout-DNB-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-14862 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Dryout-DNB-min-225x300.png\" alt=\"Dryout vs. DNB\" width=\"225\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Dryout-DNB-min-225x300.png\" \/><\/a><span>Como foi escrito, nos\u00a0<\/span><a title=\"Reator nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/nuclear-reactor\/\"><span>reatores nucleares<\/span><\/a><span>\u00a0, as limita\u00e7\u00f5es do\u00a0<\/span><strong><span>fluxo de calor local<\/span><\/strong><span>\u00a0s\u00e3o da maior import\u00e2ncia para a seguran\u00e7a do reator.\u00a0Para\u00a0<\/span><a title=\"PWR - Reator de \u00e1gua pressurizada\" href=\"https:\/\/www.nuclear-power.com\/pwr-pressurized-water-reactor\/\"><span>reatores de \u00e1gua pressurizada<\/span><\/a><span>\u00a0e tamb\u00e9m para\u00a0<\/span><a title=\"BWR - Reator de \u00e1gua fervente\" href=\"https:\/\/www.nuclear-power.com\/bwr-boiling-water-reactor\/\"><span>reatores de \u00e1gua fervente<\/span><\/a><span>\u00a0, h\u00e1 fen\u00f4menos termo-hidr\u00e1ulicos, que causam uma diminui\u00e7\u00e3o repentina na\u00a0<\/span><strong><span>efici\u00eancia da transfer\u00eancia de calor<\/span><\/strong><span>\u00a0(mais precisamente no\u00a0<\/span><strong><span>coeficiente de transfer\u00eancia de calor<\/span><\/strong><span>\u00a0).\u00a0Esses fen\u00f4menos ocorrem em determinado valor do fluxo de calor, conhecido como &#8221;\u00a0<\/span><strong><span>fluxo cr\u00edtico de calor<\/span><\/strong><span>\u00a0&#8220;.\u00a0Os fen\u00f4menos que causam a deteriora\u00e7\u00e3o da transfer\u00eancia de calor s\u00e3o diferentes para PWRs e BWRs.<\/span><\/p>\n<p><span>Nos dois tipos de reatores, o problema est\u00e1 mais ou menos associado \u00e0 sa\u00edda da ebuli\u00e7\u00e3o nucleada.\u00a0O fluxo de calor em ebuli\u00e7\u00e3o nucleado n\u00e3o pode ser aumentado indefinidamente.\u00a0Em algum valor, chamamos de \u201c\u00a0<\/span><strong><span>fluxo cr\u00edtico de calor<\/span><\/strong><span>\u00a0\u201d (\u00a0<\/span><strong><span>CHF<\/span><\/strong><span>\u00a0), o vapor produzido pode formar uma camada isolante sobre a superf\u00edcie, que por sua vez deteriora o coeficiente de transfer\u00eancia de calor.\u00a0Imediatamente ap\u00f3s o fluxo cr\u00edtico de calor ter sido alcan\u00e7ado, a ebuli\u00e7\u00e3o se torna inst\u00e1vel e a ebuli\u00e7\u00e3o de pel\u00edcula ocorre.\u00a0A transi\u00e7\u00e3o da ebuli\u00e7\u00e3o nucleada para a ebuli\u00e7\u00e3o de pel\u00edcula \u00e9 conhecida como &#8221;\u00a0<\/span><strong><span>crise de ebuli\u00e7\u00e3o<\/span><\/strong><span>\u00a0&#8220;.\u00a0Como foi escrito, os fen\u00f4menos que causam a deteriora\u00e7\u00e3o da transfer\u00eancia de calor s\u00e3o diferentes para PWRs e BWRs.<\/span><\/p>\n<ul>\n<li><strong><span>Secar.\u00a0<\/span><\/strong><span>Nos BWRs, esse fen\u00f4meno \u00e9 conhecido como\u00a0<\/span><strong><span>\u201cseca\u201d<\/span><\/strong><span>\u00a0e est\u00e1 diretamente associado a\u00a0<\/span><strong><span>altera\u00e7\u00f5es no padr\u00e3o de fluxo<\/span><\/strong><span>\u00a0durante a evapora\u00e7\u00e3o na regi\u00e3o de alta qualidade.\u00a0Em determinadas combina\u00e7\u00f5es de taxa de fluxo atrav\u00e9s de um canal, press\u00e3o, qualidade de fluxo e taxa de calor linear, o\u00a0<\/span><strong><span>filme l\u00edquido<\/span><\/strong><span>\u00a0da parede\u00a0<strong>pode esgotar-se<\/strong>\u00a0e a parede pode ser\u00a0<\/span><strong><span>seca<\/span><\/strong><span>\u00a0.\u00a0Normalmente, a superf\u00edcie do combust\u00edvel \u00e9 efetivamente resfriada com l\u00edquido fervente.\u00a0No entanto, quando o fluxo de calor excede um\u00a0<\/span><strong><span>valor cr\u00edtico<\/span><\/strong><span>\u00a0(CHF &#8211; fluxo de calor cr\u00edtico), o padr\u00e3o de fluxo pode atingir as\u00a0<\/span><strong><span>condi\u00e7\u00f5es de secagem<\/span><\/strong><span>\u00a0(a pel\u00edcula fina de l\u00edquido desaparece).\u00a0A transfer\u00eancia de calor da superf\u00edcie do combust\u00edvel para o l\u00edquido de arrefecimento \u00e9 deteriorada, com o resultado de<\/span><strong><span>aumento dr\u00e1stico da temperatura da superf\u00edcie do combust\u00edvel<\/span><\/strong><span>\u00a0.\u00a0Na regi\u00e3o de alta qualidade, a crise ocorre com um fluxo de calor menor.\u00a0Como a velocidade de fluxo no n\u00facleo de vapor \u00e9 alta, a transfer\u00eancia de calor p\u00f3s-CHF \u00e9 muito melhor do que no fluxo cr\u00edtico de baixa qualidade (ou seja, para PWRs, os aumentos de temperatura s\u00e3o maiores e mais r\u00e1pidos).<\/span><\/li>\n<li>\n<figure id=\"attachment_329\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-329\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/DNB_critical_heat_flux.jpg\"><img loading=\"lazy\" class=\"size-medium wp-image-329 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/DNB_critical_heat_flux-300x225.jpg\" alt=\"fluxo de calor cr\u00edtico e DNB (partida da ebuli\u00e7\u00e3o de nucleados)\" width=\"300\" height=\"225\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/DNB_critical_heat_flux-300x225.jpg\" \/><\/a><figcaption id=\"caption-attachment-329\" class=\"wp-caption-text\"><span>Se o fluxo de calor de um sistema de ebuli\u00e7\u00e3o for maior que o fluxo cr\u00edtico de calor, poder\u00e1 ocorrer DNB (Partida da Nucleate Boiling).<\/span><\/figcaption><\/figure>\n<p><strong><span>Partida de Nucleate Boiling.\u00a0<\/span><\/strong><span>No caso de\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/pwr-pressurized-water-reactor\/\"><span>PWRs<\/span><\/a><span>\u00a0, a quest\u00e3o cr\u00edtica de seguran\u00e7a \u00e9 denominada\u00a0<\/span><strong><span>DNB<\/span><\/strong><span>\u00a0(\u00a0<\/span><strong><span>partida da ebuli\u00e7\u00e3o nucleada<\/span><\/strong><span>\u00a0), que causa a forma\u00e7\u00e3o de uma\u00a0<\/span><strong><span>camada de vapor local<\/span><\/strong><span>\u00a0, causando uma redu\u00e7\u00e3o dr\u00e1stica na capacidade de transfer\u00eancia de calor.\u00a0Esse fen\u00f4meno ocorre na regi\u00e3o sub-resfriada ou de baixa qualidade.\u00a0O comportamento da crise de ebuli\u00e7\u00e3o depende de muitas condi\u00e7\u00f5es de fluxo (press\u00e3o, temperatura, taxa de fluxo), mas a crise de ebuli\u00e7\u00e3o ocorre em fluxos de calor relativamente altos e parece estar associado \u00e0 nuvem de bolhas adjacentes \u00e0 superf\u00edcie.\u00a0Essas bolhas ou filme de vapor reduzem a quantidade de \u00e1gua que entra.\u00a0Como esse fen\u00f4meno deteriora o coeficiente de transfer\u00eancia de calor e o fluxo de calor permanece, o calor \u00e9<\/span><strong><span>acumula-se<\/span><\/strong><span>\u00a0na barra de combust\u00edvel, causando\u00a0<\/span><strong><span>aumento dram\u00e1tico<\/span><\/strong><span>\u00a0do revestimento e da\u00a0<\/span><strong><span>temperatura do<\/span><\/strong><span>\u00a0combust\u00edvel\u00a0.\u00a0Simplesmente, \u00e9 necess\u00e1ria uma diferen\u00e7a de temperatura muito alta para transferir o fluxo de calor cr\u00edtico produzido da superf\u00edcie da barra de combust\u00edvel para o l\u00edquido de arrefecimento do reator (atrav\u00e9s da camada de vapor).\u00a0No caso de PWRs, o fluxo cr\u00edtico \u00e9 um fluxo\u00a0<\/span><strong><span>anular invertido<\/span><\/strong><span>\u00a0, enquanto que nos BWRs, o fluxo cr\u00edtico \u00e9 geralmente um fluxo anular.\u00a0A diferen\u00e7a no regime de fluxo entre o fluxo p\u00f3s-secagem e o fluxo p\u00f3s-DNB \u00e9 mostrada na figura.\u00a0Em\u00a0<\/span><strong><span>PWRs<\/span><\/strong><span>\u00a0em\u00a0<\/span><strong><span>opera\u00e7\u00e3o normal,<\/span><\/strong><span>\u00a0o fluxo \u00e9 considerado monof\u00e1sico.\u00a0Por\u00e9m, muitos estudos foram realizados sobre a natureza do\u00a0<\/span><strong><span>fluxo bif\u00e1sico<\/span><\/strong><span>\u00a0no caso de<\/span><strong><span>transientes e acidentes<\/span><\/strong><span>\u00a0(como o\u00a0<strong>acidente<\/strong>\u00a0com\u00a0<\/span><strong><span>perda de refrigerante &#8211; LOCA ou disparo de RCPs<\/span><\/strong><span>\u00a0), que s\u00e3o importantes na seguran\u00e7a do reator e devem ser comprovados e declarados no\u00a0<\/span><strong><span>Relat\u00f3rio de An\u00e1lise de Seguran\u00e7a<\/span><\/strong><span>\u00a0(SAR).<\/span><\/li>\n<\/ul>\n<\/div>\n<p>&nbsp;<\/p>\n<\/div>\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 artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A taxa de transfer\u00eancia de calor por unidade de \u00e1rea normal \u00e0 dire\u00e7\u00e3o da transfer\u00eancia de calor \u00e9 chamada fluxo de calor.\u00a0\u00c0s vezes, tamb\u00e9m \u00e9 chamado de densidade do fluxo de calor.\u00a0Engenharia T\u00e9rmica Densidade do fluxo de calor &#8211; Fluxo t\u00e9rmico A\u00a0taxa de transfer\u00eancia de calor\u00a0por unidade de \u00e1rea normal \u00e0 dire\u00e7\u00e3o da transfer\u00eancia de &#8230; <a title=\"O que \u00e9 densidade de fluxo de calor &#8211; Fluxo t\u00e9rmico &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-densidade-de-fluxo-de-calor-fluxo-termico-definicao\/\" aria-label=\"More on O que \u00e9 densidade de fluxo de calor &#8211; Fluxo t\u00e9rmico &#8211; Defini\u00e7\u00e3o\">Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>O que \u00e9 densidade de fluxo de calor - Fluxo t\u00e9rmico - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A taxa de transfer\u00eancia de calor por unidade de \u00e1rea normal para a dire\u00e7\u00e3o da transfer\u00eancia de calor \u00e9 chamada fluxo de calor. \u00c0s vezes, tamb\u00e9m \u00e9 chamado de densidade do fluxo de calor. 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