{"id":47747,"date":"2019-11-06T04:55:13","date_gmt":"2019-11-06T03:55:13","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-medicao-de-fluxo-de-calor-definicao\/"},"modified":"2020-01-24T17:48:59","modified_gmt":"2020-01-24T16:48:59","slug":"o-que-e-medicao-de-fluxo-de-calor-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-medicao-de-fluxo-de-calor-definicao\/","title":{"rendered":"O que \u00e9 medi\u00e7\u00e3o de fluxo de calor &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">A medi\u00e7\u00e3o do fluxo de calor pode ser realizada de algumas maneiras diferentes.\u00a0Alguns m\u00e9todos s\u00e3o baseados no uso do sensor de fluxo de calor.\u00a0Medi\u00e7\u00e3o de fluxo de calor<\/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>Medi\u00e7\u00e3o de fluxo de calor<\/h2>\n<p>A medi\u00e7\u00e3o do\u00a0<strong>fluxo<\/strong>\u00a0de\u00a0<strong>calor<\/strong>\u00a0pode ser realizada de algumas maneiras diferentes.<\/p>\n<ul>\n<li><strong>Medi\u00e7\u00e3o com base na diferen\u00e7a de temperatura<\/strong>\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<strong>condutividade t\u00e9rmica<\/strong>\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.<\/li>\n<li><strong>Medi\u00e7\u00e3o baseada no uso do sensor de fluxo de calor<\/strong>\u00a0.\u00a0O fluxo de calor pode ser medido diretamente por\u00a0<strong>meio de sensores<\/strong>\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.<\/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>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-arrow\" data-anchor=\"References\">\n<div class=\"su-spoiler-content su-clearfix\">\n<p>&nbsp;<\/p>\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<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A medi\u00e7\u00e3o do fluxo de calor pode ser realizada de algumas maneiras diferentes.\u00a0Alguns m\u00e9todos s\u00e3o baseados no uso do sensor de fluxo de calor.\u00a0Medi\u00e7\u00e3o de fluxo de calor Medi\u00e7\u00e3o de fluxo de calor A medi\u00e7\u00e3o do\u00a0fluxo\u00a0de\u00a0calor\u00a0pode ser realizada de algumas maneiras diferentes. Medi\u00e7\u00e3o com base na diferen\u00e7a de temperatura\u00a0.\u00a0Um m\u00e9todo geralmente conhecido, mas muitas vezes &#8230; <a title=\"O que \u00e9 medi\u00e7\u00e3o de fluxo de calor &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-medicao-de-fluxo-de-calor-definicao\/\" aria-label=\"More on O que \u00e9 medi\u00e7\u00e3o de fluxo de calor &#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 medi\u00e7\u00e3o de fluxo de calor - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A medi\u00e7\u00e3o do fluxo de calor pode ser realizada de algumas maneiras diferentes. 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