{"id":48949,"date":"2019-11-13T21:39:29","date_gmt":"2019-11-13T20:39:29","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-velocidade-superficial-fluxo-bifasico-definicao\/"},"modified":"2020-02-01T09:28:24","modified_gmt":"2020-02-01T08:28:24","slug":"o-que-e-velocidade-superficial-fluxo-bifasico-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-velocidade-superficial-fluxo-bifasico-definicao\/","title":{"rendered":"O que \u00e9 velocidade superficial &#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 velocidade superficial \u00e9 uma velocidade hipot\u00e9tica de fluxo calculada como se a fase ou fluido em quest\u00e3o fosse o \u00fanico fluindo ou presente em uma determinada \u00e1rea de se\u00e7\u00e3o transversal.\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>Velocidade superficial<\/h2>\n<p><strong>A velocidade superficial<\/strong>\u00a0\u00e9 uma\u00a0<strong>velocidade<\/strong>\u00a0hipot\u00e9tica de fluxo calculada como se a fase ou fluido em quest\u00e3o fosse o\u00a0<strong>\u00fanico fluindo<\/strong>\u00a0ou presente em uma determinada \u00e1rea de se\u00e7\u00e3o transversal.\u00a0A velocidade da fase especificada \u00e9 calculada como se a segunda fase fosse ignorada.<\/p>\n<p>Na engenharia de multif\u00e1sico flui e flui em meios porosos,\u00a0<strong>velocidade superficial (V\u00a0<sub>fase<\/sub>\u00a0ou j\u00a0<sub>fase<\/sub>\u00a0)<\/strong>\u00a0\u00e9 comumente utilizada, porque \u00e9 o valor que \u00e9 amb\u00edgua, enquanto a velocidade real \u00e9 frequentemente espacialmente dependente e sujeito a muitas hip\u00f3teses.<\/p>\n<p><span>A velocidade superficial pode ser expressa como:<\/span><br \/>\n<a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/superficial-velocity-definition.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14783 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/superficial-velocity-definition.png\" alt=\"velocidade superficial - defini\u00e7\u00e3o\" width=\"332\" height=\"196\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/superficial-velocity-definition.png\" \/><\/a><\/p>\n<p><span>Para um melhor entendimento, consideremos o tubo com uma\u00a0se\u00e7\u00e3o transversal de\u00a00,1 m\u00a0<\/span><sup><span>2<\/span><\/sup><span>\u00a0da \u00e1rea de fluxo.\u00a0Suponha que a vaz\u00e3o seja de 1 m\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0\/ s.\u00a0Para\u00a0<\/span><strong><span>o fluxo de fluido monof\u00e1sico,<\/span><\/strong><span>\u00a0a\u00a0<\/span><strong><span>velocidade superficial ser\u00e1 igual \u00e0\u00a0<\/span><\/strong><strong><span>velocidade\u00a0<\/span><\/strong><span><strong>real do fluido<\/strong>\u00a0e ser\u00e1 de 10 m \/ s.<\/span><br \/>\n<span>Para\u00a0<\/span><strong><span>o fluxo de fluido em duas fases<\/span><\/strong><span>\u00a0(por exemplo,\u00a0<strong>fluxo de<\/strong>\u00a0vapor-l\u00edquido), a situa\u00e7\u00e3o ser\u00e1 diferente.\u00a0Assumindo que a taxa de escorregamento \u00e9 a unidade, ambas as fases tomadas separadamente, ter\u00e3o velocidades superficiais de\u00a0<\/span><strong><span>5 m \/ s<\/span><\/strong><span>\u00a0.\u00a0A velocidade real resultante ser\u00e1 ent\u00e3o igual a\u00a0<\/span><strong><span>10 m \/ s<\/span><\/strong><span>\u00a0.\u00a0Se as duas fases tiverem velocidades diferentes (com escorregamento), a situa\u00e7\u00e3o ser\u00e1 mais complicada.<\/span><\/p>\n<figure id=\"attachment_14789\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-14789\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-patterns-horizontal-flow.png\"><img loading=\"lazy\" class=\"wp-image-14789 size-full lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-patterns-horizontal-flow.png\" alt=\"padr\u00f5es de fluxo - fluxo horizontal\" width=\"436\" height=\"416\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-patterns-horizontal-flow.png\" \/><\/a><figcaption id=\"caption-attachment-14789\" class=\"wp-caption-text\"><span>Um mapa de regime de fluxo para o fluxo de uma mistura ar \/ \u00e1gua em um tubo horizontal de 2,5 cm de di\u00e2metro a 25 \u00b0 C e 1 bar.\u00a0Linhas e pontos s\u00f3lidos s\u00e3o observa\u00e7\u00f5es experimentais das condi\u00e7\u00f5es de transi\u00e7\u00e3o, enquanto as zonas tracejadas representam previs\u00f5es te\u00f3ricas.\u00a0Fonte: Mandhane, JM, Gregory, GA e Aziz, KA (1974).\u00a0Um mapa de padr\u00f5es de fluxo para fluxo g\u00e1s-l\u00edquido em tubos horizontais.\u00a0Int.\u00a0J. Fluxo multif\u00e1sico<\/span><\/figcaption><\/figure>\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 velocidade superficial \u00e9 uma velocidade hipot\u00e9tica de fluxo calculada como se a fase ou fluido em quest\u00e3o fosse o \u00fanico fluindo ou presente em uma determinada \u00e1rea de se\u00e7\u00e3o transversal.\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 &#8230; <a title=\"O que \u00e9 velocidade superficial &#8211; fluxo bif\u00e1sico &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-velocidade-superficial-fluxo-bifasico-definicao\/\" aria-label=\"More on O que \u00e9 velocidade superficial &#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 velocidade superficial - fluxo bif\u00e1sico - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A velocidade superficial \u00e9 uma velocidade hipot\u00e9tica de fluxo calculada como se a fase ou o fluido em quest\u00e3o fosse o \u00fanico fluindo ou presente em uma determinada \u00e1rea de se\u00e7\u00e3o transversal. 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