{"id":49069,"date":"2019-11-14T09:19:12","date_gmt":"2019-11-14T08:19:12","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-fracao-de-vazio-fluxo-bifasico-definicao\/"},"modified":"2020-02-01T17:29:24","modified_gmt":"2020-02-01T16:29:24","slug":"o-que-e-fracao-de-vazio-fluxo-bifasico-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fracao-de-vazio-fluxo-bifasico-definicao\/","title":{"rendered":"O que \u00e9 Fra\u00e7\u00e3o de Vazio &#8211; Fluxo bif\u00e1sico &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">A fra\u00e7\u00e3o de vazio, \u03b1, \u00e9 um dos par\u00e2metros mais importantes usados \u200b\u200bpara caracterizar o fluxo de fluido em duas fases, especialmente o fluxo g\u00e1s-l\u00edquido.\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>Par\u00e2metros b\u00e1sicos do fluxo de fluido em duas fases<\/h2>\n<p>Nesta se\u00e7\u00e3o, consideraremos o fluxo simult\u00e2neo de\u00a0<strong>g\u00e1s (ou vapor) e \u00e1gua l\u00edquida<\/strong>\u00a0(como encontrado em\u00a0<a title=\"Gerador de vapor\" href=\"https:\/\/www.nuclear-power.com\/steam-generator\/\">geradores<\/a>\u00a0e condensadores de\u00a0<a title=\"Steam Generator\" href=\"https:\/\/www.nuclear-power.com\/steam-generator\/\">vapor<\/a>\u00a0) no fluxo simult\u00e2neo atrav\u00e9s de um duto com \u00e1rea de se\u00e7\u00e3o transversal A. Os subscritos\u00a0<strong>\u201cv\u201d<\/strong>\u00a0e\u00a0<strong>\u201c\u2113\u201d<\/strong>\u00a0indicam a\u00a0fase\u00a0<strong>vapor<\/strong>\u00a0e\u00a0<strong>a<\/strong>\u00a0fase\u00a0<strong>l\u00edquida<\/strong>\u00a0, respectivamente.\u00a0Os par\u00e2metros fundamentais que caracterizam esse fluxo s\u00e3o:<\/p>\n<ul>\n<li><a title=\"Fra\u00e7\u00e3o de Vazio - Fluxo de Duas Fases\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/void-fraction-two-phase-flow\/\"><strong>Fra\u00e7\u00e3o de vazio<\/strong><\/a><\/li>\n<li><a title=\"Qualidade est\u00e1tica - Qualidade do fluxo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/static-quality-flow-quality\/\"><strong>Qualidade est\u00e1tica<\/strong><\/a><\/li>\n<li><a title=\"Qualidade est\u00e1tica - Qualidade do fluxo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/static-quality-flow-quality\/\"><strong>Qualidade do fluxo<\/strong><\/a><\/li>\n<li><a title=\"Densidade da mistura - Fluxo bif\u00e1sico\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/mixture-density-two-phase-flow\/\"><strong>Densidade da mistura<\/strong><\/a><\/li>\n<li><a title=\"Taxa de Deslizamento - Taxa de Velocidade\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/slip-ratio-velocity-ratio\/\"><strong>Taxa de Deslizamento &#8211; Taxa de Velocidade<\/strong><\/a><\/li>\n<li><a title=\"Velocidade superficial - fluxo bif\u00e1sico\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/superficial-velocity-two-phase-flow\/\"><strong>Velocidade superficial<\/strong><\/a><\/li>\n<\/ul>\n<div class=\"su-spacer\"><\/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-spacer\"><\/div>\n<h2>Fra\u00e7\u00e3o de vazio<\/h2>\n<p><strong><span>A fra\u00e7\u00e3o de vazio, \u03b1<\/span><\/strong><span>\u00a0, \u00e9 um dos par\u00e2metros mais importantes usados \u200b\u200bpara caracterizar o fluxo de fluido em duas fases, especialmente o fluxo g\u00e1s-l\u00edquido.<\/span><br \/>\n<span>V\u00e1rias defini\u00e7\u00f5es geom\u00e9tricas s\u00e3o usadas para especificar este par\u00e2metro.\u00a0A fra\u00e7\u00e3o de vazio em um fluxo de fluido bif\u00e1sico pode ser definida como:<\/span><\/p>\n<ol>\n<li><span>A fra\u00e7\u00e3o do\u00a0<\/span><strong><span>volume<\/span><\/strong><span>\u00a0do\u00a0<strong>canal<\/strong>\u00a0que \u00e9 ocupado pela fase gasosa.\u00a0Essa fra\u00e7\u00e3o de vazio \u00e9 conhecida como\u00a0<\/span><strong><span>fra\u00e7\u00e3o de volume volum\u00e9trico.<\/span><\/strong><\/li>\n<li><span>A fra\u00e7\u00e3o da\u00a0<\/span><strong><span>\u00e1rea da se\u00e7\u00e3o transversal<\/span><\/strong><span>\u00a0do\u00a0<strong>canal<\/strong>\u00a0que \u00e9 ocupada pela fase gasosa.\u00a0Essa fra\u00e7\u00e3o de vazio \u00e9 conhecida como\u00a0<\/span><strong><span>fra\u00e7\u00e3o de vazio transversal<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><span>A\u00a0<\/span><strong><span>fra\u00e7\u00e3o de vazio local<\/span><\/strong><span>\u00a0refere-se \u00e0quela em um \u00fanico ponto ou volume muito pequeno.\u00a0Portanto, leva os valores de 1 ou 0.<\/span><\/li>\n<\/ol>\n<p><span>Para prop\u00f3sitos adicionais, assumiremos que uma fra\u00e7\u00e3o de vazio \u00e9 a fra\u00e7\u00e3o da\u00a0<\/span><strong><span>\u00e1rea da se\u00e7\u00e3o transversal<\/span><\/strong><span>\u00a0do\u00a0<strong>canal<\/strong>\u00a0que \u00e9 ocupada pela fase gasosa (ou seja, fra\u00e7\u00e3o de vazio da se\u00e7\u00e3o transversal) definida como:<\/span><br \/>\n<a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/void-fraction-definition.png\"><img loading=\"lazy\" class=\"size-full wp-image-14771 aligncenter lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/void-fraction-definition.png\" alt=\"defini\u00e7\u00e3o de fra\u00e7\u00e3o nula\" width=\"184\" height=\"98\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/void-fraction-definition.png\" \/><\/a><br \/>\n<span>A fra\u00e7\u00e3o de vazio \u00e9 de import\u00e2ncia no fluxo bif\u00e1sico, pois influencia os principais par\u00e2metros f\u00edsicos, como\u00a0<\/span><strong><span>viscosidade<\/span><\/strong><span>\u00a0,\u00a0<\/span><strong><span>queda de press\u00e3o<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>transfer\u00eancia de calor<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>As rela\u00e7\u00f5es entre\u00a0<\/span><strong><span>x, \u03b1 e S<\/span><\/strong><span>\u00a0podem ser deduzidas e o resultado \u00e9:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relations-between-quality-void-fraction-and-slip.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14782 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relations-between-quality-void-fraction-and-slip.png\" alt=\"rela\u00e7\u00f5es entre qualidade, fra\u00e7\u00e3o nula e escorregamento\" width=\"619\" height=\"101\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relations-between-quality-void-fraction-and-slip.png\" \/><\/a><\/p>\n<figure id=\"attachment_14781\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-14781\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Chart-Slip-Ratio.png\"><img loading=\"lazy\" class=\"size-full wp-image-14781 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Chart-Slip-Ratio.png\" alt=\"Efeito de S em \u03b1 vs x para \u00e1gua a 7 MPa.  Fonte: Buongiorno Jacopo, Departamento de Ci\u00eancia e Engenharia Nuclear do MIT, NOTAS SOBRE FLUXO EM DUAS FASES\" width=\"601\" height=\"483\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Chart-Slip-Ratio.png\" \/><\/a><figcaption id=\"caption-attachment-14781\" class=\"wp-caption-text\"><span>Efeito de S em \u03b1 vs x para \u00e1gua a 7 MPa.\u00a0Fonte: Buongiorno Jacopo, Departamento de Ci\u00eancia e Engenharia Nuclear do MIT, NOTAS SOBRE FLUXO EM DUAS FASES<\/span><\/figcaption><\/figure>\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","protected":false},"excerpt":{"rendered":"<p>A fra\u00e7\u00e3o de vazio, \u03b1, \u00e9 um dos par\u00e2metros mais importantes usados \u200b\u200bpara caracterizar o fluxo de fluido em duas fases, especialmente o fluxo g\u00e1s-l\u00edquido.\u00a0Engenharia T\u00e9rmica Par\u00e2metros b\u00e1sicos do fluxo de fluido em duas fases Nesta se\u00e7\u00e3o, consideraremos o fluxo simult\u00e2neo de\u00a0g\u00e1s (ou vapor) e \u00e1gua l\u00edquida\u00a0(como encontrado em\u00a0geradores\u00a0e condensadores de\u00a0vapor\u00a0) no fluxo simult\u00e2neo atrav\u00e9s &#8230; <a title=\"O que \u00e9 Fra\u00e7\u00e3o de Vazio &#8211; Fluxo bif\u00e1sico &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fracao-de-vazio-fluxo-bifasico-definicao\/\" aria-label=\"More on O que \u00e9 Fra\u00e7\u00e3o de Vazio &#8211; Fluxo bif\u00e1sico &#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 Fra\u00e7\u00e3o de Vazio - Fluxo bif\u00e1sico - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A fra\u00e7\u00e3o de vazio, \u03b1, \u00e9 um dos par\u00e2metros mais importantes usados para caracterizar o fluxo de fluido em duas fases, especialmente o fluxo g\u00e1s-l\u00edquido. 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