{"id":48965,"date":"2019-11-13T23:19:01","date_gmt":"2019-11-13T22:19:01","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-fluxo-anular-fluxo-bifasico-definicao\/"},"modified":"2020-02-01T09:39:47","modified_gmt":"2020-02-01T08:39:47","slug":"o-que-e-fluxo-anular-fluxo-bifasico-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-anular-fluxo-bifasico-definicao\/","title":{"rendered":"O que \u00e9 fluxo anular &#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\">O fluxo anular \u00e9 um regime de fluxo de fluxo g\u00e1s-l\u00edquido bif\u00e1sico.\u00a0\u00c9 caracterizada pela presen\u00e7a de um filme l\u00edquido que flui na parede do canal.\u00a0Fluxo anular.\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-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights lgc-first\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Fluxo Anular &#8211; Tubos Verticais<\/h2>\n<p><strong>O fluxo anular<\/strong>\u00a0\u00e9 um regime de fluxo de fluxo g\u00e1s-l\u00edquido bif\u00e1sico.\u00a0\u00c9 caracterizada pela presen\u00e7a de um\u00a0<strong>filme l\u00edquido que flui na parede do canal<\/strong>\u00a0(formando um anel anular de l\u00edquido) enquanto o\u00a0<strong>g\u00e1s flui<\/strong>\u00a0como uma fase cont\u00ednua\u00a0<strong>no centro do tubo<\/strong>\u00a0.\u00a0O n\u00facleo de fluxo pode conter got\u00edculas de l\u00edquido arrastadas.\u00a0A velocidade do n\u00facleo de g\u00e1s \u00e9 muito grande e \u00e9 grande o suficiente para causar ondas e ondula\u00e7\u00f5es de alta frequ\u00eancia na interface.\u00a0Esse regime de fluxo \u00e9 particularmente est\u00e1vel e \u00e9 desejado o regime de fluxo para\u00a0<a title=\"Fluxo de fluido bif\u00e1sico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-de-fluido-bifasico-definicao\/\">fluxo de fluido bif\u00e1sico<\/a>\u00a0de alta velocidade e alta qualidade\u00a0.<\/p>\n<p>Os fluxos anulares adiab\u00e1ticos (sem troca de calor) e os fluxos anulares diab\u00e9ticos (com troca de calor) ocorrem em aplica\u00e7\u00f5es industriais:<\/p>\n<ul>\n<li><strong>em\u00a0<a title=\"Gerador de vapor\" href=\"https:\/\/www.nuclear-power.com\/steam-generator\/\">geradores de vapor<\/a><\/strong><\/li>\n<li><strong>condensadores<\/strong><\/li>\n<li><a title=\"BWR - Reator de \u00e1gua fervente\" href=\"https:\/\/www.nuclear-power.com\/bwr-boiling-water-reactor\/\"><strong>reatores de \u00e1gua fervente &#8211; BWR<\/strong><\/a><\/li>\n<li><strong>durante acidentes em\u00a0<a title=\"PWR - Reator de \u00e1gua pressurizada\" href=\"https:\/\/www.nuclear-power.com\/pwr-pressurized-water-reactor\/\">PWRs<\/a><\/strong><\/li>\n<\/ul>\n<p>No caso de\u00a0<strong>BWR<\/strong>\u00a0, no qual\u00a0ocorre\u00a0uma\u00a0<strong>transi\u00e7\u00e3o de fase<\/strong>\u00a0(evapora\u00e7\u00e3o), o conhecimento detalhado desse regime de fluxo \u00e9 de grande import\u00e2ncia.\u00a0Em determinadas combina\u00e7\u00f5es de taxa de fluxo atrav\u00e9s de um canal, press\u00e3o, qualidade de fluxo e taxa de calor linear, o\u00a0<strong>filme l\u00edquido<\/strong>\u00a0da parede\u00a0<strong>pode esgotar-se<\/strong>\u00a0e a parede pode ser\u00a0<strong>seca<\/strong>\u00a0.\u00a0Esse fen\u00f4meno \u00e9 geralmente conhecido como\u00a0<strong>&#8220;seca&#8221;<\/strong>\u00a0.\u00a0<strong>A secagem<\/strong>\u00a0\u00e9 acompanhada por um\u00a0<strong>r\u00e1pido aumento da temperatura da parede<\/strong>\u00a0e \u00e9 importante para a seguran\u00e7a dos BWRs.<\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights lgc-last\">\n<div class=\"inside-grid-column\">\n<figure id=\"attachment_14791\" class=\"wp-caption alignleft\" aria-describedby=\"caption-attachment-14791\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Bubbly-Slug-Churn-Annular-Mist-Flow.png\"><img loading=\"lazy\" class=\"wp-image-14791 size-medium lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Bubbly-Slug-Churn-Annular-Mist-Flow-300x191.png\" alt=\"Borbulhante - Lesma - Batedeira - Anular - N\u00e9voa - Fluxo\" width=\"300\" height=\"191\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Bubbly-Slug-Churn-Annular-Mist-Flow-300x191.png\" \/><\/a><figcaption id=\"caption-attachment-14791\" class=\"wp-caption-text\">Esbo\u00e7os de regimes de fluxo para fluxo bif\u00e1sico em um tubo vertical.\u00a0Fonte: Weisman, J. Padr\u00f5es de fluxo bif\u00e1sicos.\u00a0Cap\u00edtulo 15 do Manual de Fluidos em Movimento, Cheremisinoff NP, Gupta R. 1983, Ann Arbor Science Publishers.<\/figcaption><\/figure>\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<figure id=\"attachment_14788\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-14788\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-patterns-vertical-flow-Hewitt.png\"><img loading=\"lazy\" class=\"wp-image-14788 size-full lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-patterns-vertical-flow-Hewitt.png\" alt=\"padr\u00f5es de fluxo - fluxo vertical - Hewitt\" width=\"428\" height=\"397\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-patterns-vertical-flow-Hewitt.png\" \/><\/a><figcaption id=\"caption-attachment-14788\" class=\"wp-caption-text\">O mapa do regime de fluxo vertical de Hewitt e Roberts (1969) para fluxo em um tubo de 3,2 cm de di\u00e2metro, validado para fluxo de ar \/ \u00e1gua \u00e0 press\u00e3o atmosf\u00e9rica e fluxo de vapor \/ \u00e1gua a alta press\u00e3o.\u00a0Fonte: Brennen, CE, Fundamentos de fluxos multif\u00e1sicos, Cambridge University Press, 2005, ISBN 0521 848040<\/figcaption><\/figure>\n<div class=\"su-spacer\"><\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<h2><span>Fluxo Anular &#8211; Tubos Horizontais<\/span><\/h2>\n<p><span>Semelhante ao fluxo vertical, em velocidades de fluxo de g\u00e1s maiores, o l\u00edquido forma um\u00a0<\/span><strong><span>filme anular<\/span><\/strong><span>\u00a0cont\u00ednuo\u00a0<strong>na parede do canal<\/strong>\u00a0.\u00a0O fluxo anular horizontal \u00e9 caracterizado pela presen\u00e7a de uma\u00a0<\/span><strong><span>pel\u00edcula l\u00edquida mais espessa que flui no fundo<\/span><\/strong><span>\u00a0da parede do canal.\u00a0O g\u00e1s flui como uma fase cont\u00ednua no centro do tubo.\u00a0O n\u00facleo de fluxo pode conter got\u00edculas de l\u00edquido arrastadas.\u00a0A velocidade do n\u00facleo de g\u00e1s \u00e9 muito grande e \u00e9 grande o suficiente para causar ondas de alta frequ\u00eancia e ondula\u00e7\u00f5es na interface.\u00a0Esse regime de fluxo \u00e9 particularmente est\u00e1vel e \u00e9 desejado o regime de fluxo para fluxo de fluido bif\u00e1sico de alta velocidade e alta qualidade.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\">\n<figure id=\"attachment_14790\" class=\"wp-caption alignleft\" aria-describedby=\"caption-attachment-14790\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Bubbly-Slug-Plug-Annular-Stratified-Mist-Wavy.png\"><img loading=\"lazy\" class=\"wp-image-14790 size-medium lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Bubbly-Slug-Plug-Annular-Stratified-Mist-Wavy-300x252.png\" alt=\"bolha, plug, lesma, anular, n\u00e9voa, fluxo estratificado ou ondulado\" width=\"300\" height=\"252\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Bubbly-Slug-Plug-Annular-Stratified-Mist-Wavy-300x252.png\" \/><\/a><figcaption id=\"caption-attachment-14790\" class=\"wp-caption-text\"><span>Esbo\u00e7os de regimes de fluxo para fluxo bif\u00e1sico em um tubo horizontal.\u00a0Fonte: Weisman, J. Padr\u00f5es de fluxo bif\u00e1sicos.\u00a0Cap\u00edtulo 15 do Manual de Fluidos em Movimento, Cheremisinoff NP, Gupta R. 1983, Ann Arbor Science Publishers.<\/span><\/figcaption><\/figure>\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<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<br \/>\n<\/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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>O fluxo anular \u00e9 um regime de fluxo de fluxo g\u00e1s-l\u00edquido bif\u00e1sico.\u00a0\u00c9 caracterizada pela presen\u00e7a de um filme l\u00edquido que flui na parede do canal.\u00a0Fluxo anular.\u00a0Engenharia T\u00e9rmica Fluxo Anular &#8211; Tubos Verticais O fluxo anular\u00a0\u00e9 um regime de fluxo de fluxo g\u00e1s-l\u00edquido bif\u00e1sico.\u00a0\u00c9 caracterizada pela presen\u00e7a de um\u00a0filme l\u00edquido que flui na parede do canal\u00a0(formando &#8230; <a title=\"O que \u00e9 fluxo anular &#8211; fluxo bif\u00e1sico &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-anular-fluxo-bifasico-definicao\/\" aria-label=\"More on O que \u00e9 fluxo anular &#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 fluxo anular - fluxo bif\u00e1sico - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O fluxo anular \u00e9 um regime de fluxo de fluxo g\u00e1s-l\u00edquido bif\u00e1sico. \u00c9 caracterizada pela presen\u00e7a de um filme l\u00edquido que flui na parede do canal. 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