{"id":48977,"date":"2019-11-14T00:37:29","date_gmt":"2019-11-13T23:37:29","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-queda-de-pressao-modelo-de-fluxo-homogeneo-definicao\/"},"modified":"2020-02-01T09:45:00","modified_gmt":"2020-02-01T08:45:00","slug":"o-que-e-queda-de-pressao-modelo-de-fluxo-homogeneo-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-queda-de-pressao-modelo-de-fluxo-homogeneo-definicao\/","title":{"rendered":"O que \u00e9 Queda de Press\u00e3o &#8211; Modelo de Fluxo Homog\u00eaneo &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Modelo de Fluxo Homog\u00eaneo.\u00a0A abordagem mais simples para a previs\u00e3o de fluxos bif\u00e1sicos \u00e9 tratar todo o fluxo bif\u00e1sico como se fosse l\u00edquido<\/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>Queda de Press\u00e3o &#8211; Modelo de Fluxo Homog\u00eaneo<\/h2>\n<p>A abordagem mais simples para a previs\u00e3o de fluxos bif\u00e1sicos \u00e9 tratar todo o fluxo bif\u00e1sico como se fosse\u00a0<strong>l\u00edquido<\/strong>\u00a0, exceto o fluxo na\u00a0<strong>velocidade da mistura<\/strong>\u00a0bif\u00e1sica\u00a0.\u00a0As quedas de press\u00e3o bif\u00e1sicas para fluxos dentro de tubula\u00e7\u00f5es e canais s\u00e3o a soma de tr\u00eas contribui\u00e7\u00f5es:<\/p>\n<ul>\n<li>a queda de press\u00e3o est\u00e1tica\u00a0<strong>staticp\u00a0<sub>est\u00e1tica<\/sub><\/strong>(\u00a0<a title=\"Cabe\u00e7a de eleva\u00e7\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/bernoullis-equation-bernoullis-principle\/elevation-head-2\/\">cabe\u00e7a de eleva\u00e7\u00e3o<\/a>\u00a0)<\/li>\n<li>o momento de queda de press\u00e3o\u00a0<strong>momp\u00a0<sub>m\u00e3e<\/sub><\/strong>\u00a0(\u00a0<a title=\"Acelera\u00e7\u00e3o de Fluidos - Perda de Press\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/minor-head-loss-local-losses\/fluid-acceleration-pressure-loss\/\">acelera\u00e7\u00e3o de fluidos<\/a>\u00a0)<\/li>\n<li>a queda de press\u00e3o de atrito\u00a0<strong>\u2206p\u00a0<sub>frito<\/sub><\/strong><\/li>\n<\/ul>\n<p>A queda de press\u00e3o total do fluxo bif\u00e1sico \u00e9 ent\u00e3o:<\/p>\n<p><strong>Totalp\u00a0<sub>total<\/sub>\u00a0= staticp\u00a0<sub>est\u00e1tico<\/sub>\u00a0+\u00a0<sub>momp\u00a0<\/sub><sub>m\u00e3e<\/sub>\u00a0+\u00a0<sub>frp frito<\/sub><\/strong><\/p>\n<p>As quedas de press\u00e3o est\u00e1ticas e de momento podem ser calculadas da mesma forma que no caso de fluxo monof\u00e1sico e usando a\u00a0<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\/\">densidade<\/a>\u00a0homog\u00eanea da\u00a0<a title=\"Mixture Density \u2013 Two-phase Flow\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/mixture-density-two-phase-flow\/\">mistura<\/a>\u00a0:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/mixture-density-definition.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14774 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/mixture-density-definition.png\" alt=\"densidade da mistura - defini\u00e7\u00e3o\" width=\"312\" height=\"51\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/mixture-density-definition.png\" \/><\/a><\/p>\n<p>O termo mais problem\u00e1tica \u00e9 a\u00a0<strong>queda de press\u00e3o de atrito\u00a0<\/strong><strong>Ap\u00a0<sub>atrito contra a\u00e7o<\/sub><\/strong>\u00a0, o qual \u00e9 baseado na queda de press\u00e3o de fase \u00fanica que \u00e9 multiplicado pelo\u00a0<strong>factor de correc\u00e7\u00e3o de duas fases<\/strong>\u00a0(\u00a0<strong>de atrito homog\u00e9nea multiplicador &#8211; \u03a6\u00a0<sub>Lo\u00a0<\/sub><sup>2<\/sup><\/strong>\u00a0).\u00a0Por essa abordagem, o componente de atrito da queda de press\u00e3o bif\u00e1sica \u00e9:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/two-phase-pressure-drop-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14901 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/two-phase-pressure-drop-equation.png\" alt=\"queda de press\u00e3o bif\u00e1sica - equa\u00e7\u00e3o\" width=\"225\" height=\"68\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/two-phase-pressure-drop-equation.png\" \/><\/a><\/p>\n<p>onde\u00a0<strong>(dP \/ dz)\u00a0<sub>2f<\/sub><\/strong>\u00a0\u00a0\u00e9 gradiente de press\u00e3o de atrito do fluxo bif\u00e1sico e\u00a0<strong>(dP \/ dz)\u00a0<sub>1f<\/sub><\/strong>\u00a0\u00a0\u00e9 gradiente de press\u00e3o de atrito se o fluxo inteiro (da taxa de fluxo de massa total G) fluir como l\u00edquido no canal (\u00a0<a title=\"Perda de Cabe\u00e7a Maior - Perda de Fric\u00e7\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/\">press\u00e3o monof\u00e1sica padr\u00e3o gota<\/a>\u00a0).\u00a0O termo\u00a0<strong>\u03a6\u00a0<sub>lo\u00a0<\/sub><sup>2\u00a0<\/sup><\/strong>\u00a0\u00e9 o\u00a0<strong>multiplicador de atrito homog\u00eaneo<\/strong>\u00a0, que pode ser derivado de acordo com v\u00e1rios m\u00e9todos.\u00a0Um dos multiplicadores poss\u00edveis \u00e9 igual a\u00a0<strong>\u03a6\u00a0<sub>lo\u00a0<\/sub><sup>2<\/sup>\u00a0\u00a0= (1 + x\u00a0<sub>g<\/sub>\u00a0(\u03c1\u00a0<sub>l<\/sub>\u00a0\/ \u03c1\u00a0<sub>g<\/sub>\u00a0&#8211; 1))\u00a0\u00a0e, portanto:<\/strong><br \/>\n<a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/two-phase-pressure-drop-equation2.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14902 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/two-phase-pressure-drop-equation2.png\" alt=\"queda de press\u00e3o bif\u00e1sica - equa\u00e7\u00e3o2\" width=\"369\" height=\"78\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/two-phase-pressure-drop-equation2.png\" \/><\/a><\/p>\n<p><span>Como pode ser visto, este modelo simples sugere que as\u00a0<\/span><strong><span>perdas por atrito bif\u00e1sicas s\u00e3o, de qualquer forma, superiores \u00e0s perdas por atrito monof\u00e1sico.\u00a0<\/span><\/strong><span>O multiplicador de atrito homog\u00eaneo aumenta rapidamente com a\u00a0<\/span><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><span>qualidade do fluxo<\/span><\/strong><\/a><span>\u00a0.<\/span><\/p>\n<p><span>As\u00a0<\/span><strong><span>qualidades<\/span><\/strong><span>\u00a0t\u00edpicas de\u00a0<strong>fluxo<\/strong>\u00a0em\u00a0<\/span><a title=\"Gerador de vapor\" href=\"https:\/\/www.nuclear-power.com\/steam-generator\/\"><strong><span>geradores de vapor<\/span><\/strong><\/a><span>\u00a0e\u00a0<\/span><a title=\"BWR - Reator de \u00e1gua fervente\" href=\"https:\/\/www.nuclear-power.com\/bwr-boiling-water-reactor\/\"><strong><span>n\u00facleos BWR<\/span><\/strong><\/a><span>\u00a0s\u00e3o da ordem de 10 a 20%.\u00a0A perda de fric\u00e7\u00e3o bif\u00e1sica correspondente seria ent\u00e3o\u00a0<\/span><strong><span>2 a 4<\/span><\/strong><span>\u00a0vezes a de um sistema monof\u00e1sico equivalente.<\/span><\/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>Modelo de Fluxo Homog\u00eaneo.\u00a0A abordagem mais simples para a previs\u00e3o de fluxos bif\u00e1sicos \u00e9 tratar todo o fluxo bif\u00e1sico como se fosse l\u00edquido Queda de Press\u00e3o &#8211; Modelo de Fluxo Homog\u00eaneo A abordagem mais simples para a previs\u00e3o de fluxos bif\u00e1sicos \u00e9 tratar todo o fluxo bif\u00e1sico como se fosse\u00a0l\u00edquido\u00a0, exceto o fluxo na\u00a0velocidade da &#8230; <a title=\"O que \u00e9 Queda de Press\u00e3o &#8211; Modelo de Fluxo Homog\u00eaneo &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-queda-de-pressao-modelo-de-fluxo-homogeneo-definicao\/\" aria-label=\"More on O que \u00e9 Queda de Press\u00e3o &#8211; Modelo de Fluxo Homog\u00eaneo &#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 Queda de Press\u00e3o - Modelo de Fluxo Homog\u00eaneo - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Modelo de Fluxo Homog\u00eaneo. 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