{"id":47356,"date":"2019-11-04T03:48:12","date_gmt":"2019-11-04T02:48:12","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-fluxo-de-calor-minimo-extincao-saida-da-ebulicao-do-filme-definicao\/"},"modified":"2020-01-23T10:56:02","modified_gmt":"2020-01-23T09:56:02","slug":"o-que-e-fluxo-de-calor-minimo-extincao-saida-da-ebulicao-do-filme-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-de-calor-minimo-extincao-saida-da-ebulicao-do-filme-definicao\/","title":{"rendered":"O que \u00e9 fluxo de calor m\u00ednimo &#8211; extin\u00e7\u00e3o &#8211; sa\u00edda da ebuli\u00e7\u00e3o de pel\u00edcula &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Os termos extin\u00e7\u00e3o, fluxo m\u00ednimo de calor, retorno \u00e0 ebuli\u00e7\u00e3o nucleada, afastamento da ebuli\u00e7\u00e3o de pel\u00edcula e colapso da ebuli\u00e7\u00e3o de pel\u00edcula foram usados \u200b\u200balternadamente para se referir a v\u00e1rias formas de reumidifica\u00e7\u00e3o.\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>Fluxo m\u00ednimo de calor &#8211; extin\u00e7\u00e3o &#8211; sa\u00edda da ebuli\u00e7\u00e3o de pel\u00edcula<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Leidenfrost-Point-Boiling-Curve.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-20772 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Leidenfrost-Point-Boiling-Curve-283x300.png\" alt=\"Ponto de Leidenfrost\" width=\"283\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Leidenfrost-Point-Boiling-Curve-283x300.png\" \/><\/a>O\u00a0<strong>ponto Leidenfrost<\/strong>\u00a0, que corresponde ao\u00a0<strong>fluxo de calor m\u00ednimo<\/strong>\u00a0, \u00e9 de interesse pr\u00e1tico, pois representa o limite mais baixo para o fluxo de calor no regime de ebuli\u00e7\u00e3o de pel\u00edcula.\u00a0Se o fluxo de calor cair abaixo desse m\u00ednimo, o filme entrar\u00e1 em colapso, fazendo com que a superf\u00edcie esfrie e a ebuli\u00e7\u00e3o nucleada seja restabelecida.\u00a0Portanto, nesse ponto,\u00a0ocorre o\u00a0<strong>retorno \u00e0 ebuli\u00e7\u00e3o nucleada<\/strong>\u00a0(RNB).\u00a0Os termos extin\u00e7\u00e3o, fluxo m\u00ednimo de calor, retorno \u00e0 ebuli\u00e7\u00e3o nucleada, afastamento da ebuli\u00e7\u00e3o de pel\u00edcula, colapso da ebuli\u00e7\u00e3o de pel\u00edcula e ponto de Leidenfrost foram usados \u200b\u200bde forma intercambi\u00e1vel para se referir a v\u00e1rias formas de reumidifica\u00e7\u00e3o, mas n\u00e3o s\u00e3o exatamente sin\u00f4nimos.<\/p>\n<p>Usando a teoria da estabilidade, Zuber derivou a seguinte express\u00e3o para o fluxo de calor m\u00ednimo (e o\u00a0<strong>ponto<\/strong>\u00a0correspondente de\u00a0<strong>Leidenfrost<\/strong>\u00a0) para uma grande placa horizontal:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/leidenfrost-point-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20788 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/leidenfrost-point-equation.png\" alt=\"ponto de leidenfrost - equa\u00e7\u00e3o\" width=\"413\" height=\"83\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/leidenfrost-point-equation.png\" \/><\/a><\/p>\n<p>Onde<\/p>\n<ul>\n<li>q\u00a0<sub>min<\/sub>\u00a0&#8211; fluxo de calor m\u00ednimo [W \/ m\u00a0<sup>2<\/sup>\u00a0]<\/li>\n<li>h\u00a0<sub>fg<\/sub>\u00a0\u00a0&#8211; entalpia de vaporiza\u00e7\u00e3o, J \/ kg<\/li>\n<li>g &#8211; acelera\u00e7\u00e3o gravitacional m \/ s\u00a0<sup>2<\/sup><\/li>\n<li>\u03c1\u00a0<sub>l<\/sub>\u00a0&#8211; densidade do l\u00edquido kg \/ m\u00a0<sup>3<\/sup><\/li>\n<li>\u03c1\u00a0<sub>v<\/sub>\u00a0&#8211; densidade do vapor kg \/ m\u00a0<sup>3<\/sup><\/li>\n<li>\u03c3 &#8211; interface tens\u00e3o superficial-vapor-l\u00edquido N \/ m<\/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>Efeito Leidenfrost<\/span><\/h2>\n<p><span>O\u00a0<\/span><strong><span>efeito Leidenfrost<\/span><\/strong><span>\u00a0\u00e9 um fen\u00f4meno f\u00edsico no qual um l\u00edquido, em contato pr\u00f3ximo com uma massa significativamente mais quente (por exemplo, uma gota de \u00e1gua em uma panela quente) do que o ponto de ebuli\u00e7\u00e3o do l\u00edquido, produz uma camada de vapor isolante que impede que o l\u00edquido ferva rapidamente.\u00a0O fato de uma gota de \u00e1gua durar muito tempo quando depositado em um metal muito mais quente que a temperatura de ebuli\u00e7\u00e3o da \u00e1gua foi relatado pela primeira vez por Hermann Boerhaave em 1732. N\u00e3o foi investigado extensivamente at\u00e9 1756 quando um m\u00e9dico alem\u00e3o Johann Gottlob Leidenfrost publicou &#8221; A Tratado sobre algumas qualidades da \u00e1gua comum &#8221;.<\/span><\/p>\n<p><span>Esse efeito pode ser demonstrado geralmente durante o cozimento, quando aspergidas gotas de \u00e1gua em uma panela para medir sua temperatura: se a temperatura da panela estiver igual ou acima do\u00a0<\/span><strong><span>ponto de<\/span><\/strong><span>\u00a0congelamento, a \u00e1gua desliza pela panela e leva mais tempo para evaporar do que em uma panela. abaixo da temperatura do ponto Leidenfrost (mas ainda acima da temperatura de ebuli\u00e7\u00e3o).\u00a0O ponto Leidenfrost, que corresponde ao fluxo de calor m\u00ednimo, \u00e9 de interesse pr\u00e1tico, pois representa o limite mais baixo para o fluxo de calor no regime de ebuli\u00e7\u00e3o de pel\u00edcula.\u00a0Se o fluxo de calor cair abaixo desse m\u00ednimo, o filme entrar\u00e1 em colapso, fazendo com que a superf\u00edcie esfrie e a ebuli\u00e7\u00e3o nucleada seja restabelecida.\u00a0O efeito Leidenfrost tamb\u00e9m \u00e9 respons\u00e1vel pela capacidade do nitrog\u00eanio l\u00edquido deslizar pelos pisos.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Leidenfrost-Effect-Water-Drop.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20771 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Leidenfrost-Effect-Water-Drop.png\" alt=\"Efeito Leidenfrost - Gota d'\u00e1gua\" width=\"1148\" height=\"681\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Leidenfrost-Effect-Water-Drop.png\" \/><\/a><\/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 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>Os termos extin\u00e7\u00e3o, fluxo m\u00ednimo de calor, retorno \u00e0 ebuli\u00e7\u00e3o nucleada, afastamento da ebuli\u00e7\u00e3o de pel\u00edcula e colapso da ebuli\u00e7\u00e3o de pel\u00edcula foram usados \u200b\u200balternadamente para se referir a v\u00e1rias formas de reumidifica\u00e7\u00e3o.\u00a0Engenharia T\u00e9rmica Fluxo m\u00ednimo de calor &#8211; extin\u00e7\u00e3o &#8211; sa\u00edda da ebuli\u00e7\u00e3o de pel\u00edcula O\u00a0ponto Leidenfrost\u00a0, que corresponde ao\u00a0fluxo de calor m\u00ednimo\u00a0, \u00e9 &#8230; <a title=\"O que \u00e9 fluxo de calor m\u00ednimo &#8211; extin\u00e7\u00e3o &#8211; sa\u00edda da ebuli\u00e7\u00e3o de pel\u00edcula &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-de-calor-minimo-extincao-saida-da-ebulicao-do-filme-definicao\/\" aria-label=\"More on O que \u00e9 fluxo de calor m\u00ednimo &#8211; extin\u00e7\u00e3o &#8211; sa\u00edda da ebuli\u00e7\u00e3o de pel\u00edcula &#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 fluxo de calor m\u00ednimo - extin\u00e7\u00e3o - sa\u00edda da ebuli\u00e7\u00e3o do filme - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Os termos extin\u00e7\u00e3o, fluxo m\u00ednimo de calor, retorno \u00e0 ebuli\u00e7\u00e3o nucleada, afastamento da ebuli\u00e7\u00e3o do filme e colapso da ebuli\u00e7\u00e3o do filme foram usados alternadamente para se referir a v\u00e1rias formas de reumidifica\u00e7\u00e3o. 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