{"id":48981,"date":"2019-11-14T00:55:15","date_gmt":"2019-11-13T23:55:15","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-a-correlacao-de-lockhart-martinelli-definicao\/"},"modified":"2020-02-01T09:47:33","modified_gmt":"2020-02-01T08:47:33","slug":"o-que-e-a-correlacao-de-lockhart-martinelli-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-correlacao-de-lockhart-martinelli-definicao\/","title":{"rendered":"O que \u00e9 a correla\u00e7\u00e3o de Lockhart-Martinelli – Defini\u00e7\u00e3o"},"content":{"rendered":"
\n
Correla\u00e7\u00e3o de Lockhart-Martinelli.\u00a0O m\u00e9todo de Lockhart e Martinelli \u00e9 o m\u00e9todo de fluxos separados que previu a queda de press\u00e3o de atrito bif\u00e1sica.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
<\/div>\n
\n
\n
<\/div>\n

Correla\u00e7\u00e3o de Lockhart-Martinelli<\/h2>\n

Uma abordagem alternativa para calcular a\u00a0queda de press\u00e3o bif\u00e1sica<\/a>\u00a0\u00e9\u00a0o modelo de fases separadas.<\/strong><\/p>\n

Neste modelo, as\u00a0fases<\/strong>\u00a0s\u00e3o consideradas fluindo\u00a0separadamente<\/strong>\u00a0no canal, cada uma ocupando uma\u00a0determinada fra\u00e7\u00e3o<\/strong>\u00a0da se\u00e7\u00e3o transversal do canal e cada uma com uma\u00a0determinada velocidade<\/strong>\u00a0.\u00a0\u00c9 \u00f3bvio que a previs\u00e3o da\u00a0fra\u00e7\u00e3o de vazio<\/strong><\/a>\u00a0\u00e9 muito importante para esses m\u00e9todos.\u00a0In\u00fameros m\u00e9todos est\u00e3o dispon\u00edveis para prever a fra\u00e7\u00e3o nula.<\/p>\n

O m\u00e9todo de\u00a0Lockhart e Martinelli<\/strong>\u00a0\u00e9 o m\u00e9todo original que previa a\u00a0queda de press\u00e3o de atrito bif\u00e1sica com<\/strong>\u00a0base em um multiplicador de atrito para a\u00a0fase l\u00edquida ou a fase vapor<\/strong>\u00a0:<\/p>\n

Ap\u00a0atrito contra a\u00e7o<\/sub>\u00a0= \u03a6\u00a0ltt\u00a0<\/sub>2<\/sup>\u00a0.\u00a0Lp\u00a0l<\/sub><\/strong>\u00a0(fase l\u00edquida \u2206p)<\/p>\n

Ap\u00a0atrito contra a\u00e7o<\/sub>\u00a0= \u03a6\u00a0gtt\u00a0<\/sub>2<\/sup>\u00a0.\u00a0Gp\u00a0g<\/sub><\/strong>\u00a0(fase de vapor \u2206p)<\/p>\n

Os fatores de atrito monof\u00e1sicos do l\u00edquido\u00a0f\u00a0l<\/sub><\/strong>e do vapor\u00a0f\u00a0g<\/sub><\/strong>\u00a0s\u00e3o\u00a0baseados na fase monof\u00e1sica que<\/a>\u00a0flui sozinha no canal, em\u00a0regimes\u00a0laminar viscoso<\/a>\u00a0(v) ou\u00a0turbulento<\/a>\u00a0(t).<\/p>\n

\u2206p\u00a0l<\/sub><\/strong>\u00a0pode ser calculado classicamente, mas com a aplica\u00e7\u00e3o de\u00a0(1-x)\u00a02<\/sup><\/strong>\u00a0na express\u00e3o e\u00a0\u2206p\u00a0g<\/sub><\/strong>\u00a0com aplica\u00e7\u00e3o da qualidade de vapor\u00a0x\u00a02,<\/sup><\/strong>\u00a0respectivamente.<\/p>\n

Os multiplicadores bif\u00e1sicos\u00a0& Phi\u00a0ltt\u00a0<\/sub>2<\/sup><\/strong>\u00a0e\u00a0\u03a6\u00a0gtt\u00a0<\/sub>2<\/sup><\/strong>s\u00e3o iguais a:<\/p>\n

\"Lockhart-Martinelli<\/a><\/p>\n

onde\u00a0X\u00a0tt<\/sub><\/strong>\u00e9 o\u00a0par\u00e2metro de Martinelli<\/strong>\u00a0definido como:<\/p>\n

\"Par\u00e2metro<\/a><\/p>\n

\"Lockhart-Martinelli<\/a>e o valor de\u00a0C<\/strong>\u00a0nessas equa\u00e7\u00f5es depende dos\u00a0regimes<\/a>\u00a0de\u00a0fluxo<\/a>\u00a0do l\u00edquido e do vapor.\u00a0Esses valores est\u00e3o na tabela a seguir.<\/p>\n

A correla\u00e7\u00e3o de Lockhart-Martinelli\u00a0<\/strong>foi considerada adequada para fluxos bif\u00e1sicos a press\u00f5es baixas e moderadas.\u00a0Para aplica\u00e7\u00f5es com press\u00f5es mais altas, s\u00e3o recomendados os modelos revisados \u200b\u200bde Martinelli e Nelson (1948) e Thom (1964).<\/p>\n

\"modelo<\/a>
Correla\u00e7\u00f5es para fra\u00e7\u00e3o de vazio e queda de press\u00e3o de atrito (Lockhart e Martinelli, 1949)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n

……………………………………………………………………………………………………………………………….<\/p>\n

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":"

Correla\u00e7\u00e3o de Lockhart-Martinelli.\u00a0O m\u00e9todo de Lockhart e Martinelli \u00e9 o m\u00e9todo de fluxos separados que previu a queda de press\u00e3o de atrito bif\u00e1sica.\u00a0Engenharia T\u00e9rmica Correla\u00e7\u00e3o de Lockhart-Martinelli Uma abordagem alternativa para calcular a\u00a0queda de press\u00e3o bif\u00e1sica\u00a0\u00e9\u00a0o modelo de fases separadas. Neste modelo, as\u00a0fases\u00a0s\u00e3o consideradas fluindo\u00a0separadamente\u00a0no canal, cada uma ocupando uma\u00a0determinada fra\u00e7\u00e3o\u00a0da se\u00e7\u00e3o transversal do canal … 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":"\nO que \u00e9 a correla\u00e7\u00e3o de Lockhart-Martinelli - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Correla\u00e7\u00e3o de Lockhart-Martinelli. O m\u00e9todo de Lockhart e Martinelli \u00e9 o m\u00e9todo de fluxos separados que previu a queda de press\u00e3o de atrito bif\u00e1sica. Engenharia T\u00e9rmica\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-correlacao-de-lockhart-martinelli-definicao\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"O que \u00e9 a correla\u00e7\u00e3o de Lockhart-Martinelli - Defini\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"Correla\u00e7\u00e3o de Lockhart-Martinelli. O m\u00e9todo de Lockhart e Martinelli \u00e9 o m\u00e9todo de fluxos separados que previu a queda de press\u00e3o de atrito bif\u00e1sica. Engenharia T\u00e9rmica\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-correlacao-de-lockhart-martinelli-definicao\/\" \/>\n<meta property=\"og:site_name\" content=\"Thermal Engineering\" \/>\n<meta property=\"article:published_time\" content=\"2019-11-13T23:55:15+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-02-01T08:47:33+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Lockhart-Martinelli-multipliers.png\" \/>\n<meta name=\"twitter:card\" content=\"summary\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\">\n\t<meta name=\"twitter:data1\" content=\"Nick Connor\">\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\">\n\t<meta name=\"twitter:data2\" content=\"2 minutos\">\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebSite\",\"@id\":\"https:\/\/www.thermal-engineering.org\/fr\/#website\",\"url\":\"https:\/\/www.thermal-engineering.org\/fr\/\",\"name\":\"Thermal Engineering\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":\"https:\/\/www.thermal-engineering.org\/fr\/?s={search_term_string}\",\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"pt-BR\"},{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-correlacao-de-lockhart-martinelli-definicao\/#primaryimage\",\"inLanguage\":\"pt-BR\",\"url\":\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Lockhart-Martinelli-multipliers.png\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-correlacao-de-lockhart-martinelli-definicao\/#webpage\",\"url\":\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-correlacao-de-lockhart-martinelli-definicao\/\",\"name\":\"O que \\u00e9 a correla\\u00e7\\u00e3o de Lockhart-Martinelli - Defini\\u00e7\\u00e3o\",\"isPartOf\":{\"@id\":\"https:\/\/www.thermal-engineering.org\/fr\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-correlacao-de-lockhart-martinelli-definicao\/#primaryimage\"},\"datePublished\":\"2019-11-13T23:55:15+00:00\",\"dateModified\":\"2020-02-01T08:47:33+00:00\",\"author\":{\"@id\":\"https:\/\/www.thermal-engineering.org\/fr\/#\/schema\/person\/e8c544db9afedaec8574d6464f9398bb\"},\"description\":\"Correla\\u00e7\\u00e3o de Lockhart-Martinelli. O m\\u00e9todo de Lockhart e Martinelli \\u00e9 o m\\u00e9todo de fluxos separados que previu a queda de press\\u00e3o de atrito bif\\u00e1sica. Engenharia T\\u00e9rmica\",\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-correlacao-de-lockhart-martinelli-definicao\/\"]}]},{\"@type\":\"Person\",\"@id\":\"https:\/\/www.thermal-engineering.org\/fr\/#\/schema\/person\/e8c544db9afedaec8574d6464f9398bb\",\"name\":\"Nick Connor\",\"image\":{\"@type\":\"ImageObject\",\"@id\":\"https:\/\/www.thermal-engineering.org\/fr\/#personlogo\",\"inLanguage\":\"pt-BR\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/84c0dec310b44b65da29dc9df6925239?s=96&d=mm&r=g\",\"caption\":\"Nick Connor\"}}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","_links":{"self":[{"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/posts\/48981"}],"collection":[{"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/comments?post=48981"}],"version-history":[{"count":0,"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/posts\/48981\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/media?parent=48981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/categories?post=48981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.thermal-engineering.org\/pt-br\/wp-json\/wp\/v2\/tags?post=48981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}