{"id":49041,"date":"2019-11-14T06:42:13","date_gmt":"2019-11-14T05:42:13","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-o-metodo-de-comprimento-de-tubo-equivalente-definicao\/"},"modified":"2020-02-01T16:24:59","modified_gmt":"2020-02-01T15:24:59","slug":"o-que-e-o-metodo-de-comprimento-de-tubo-equivalente-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-metodo-de-comprimento-de-tubo-equivalente-definicao\/","title":{"rendered":"O que \u00e9 o m\u00e9todo de comprimento de tubo equivalente &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">O m\u00e9todo de comprimento equivalente (O m\u00e9todo Le \/ D) permite ao usu\u00e1rio descrever a perda de press\u00e3o atrav\u00e9s de um cotovelo ou acess\u00f3rio como um comprimento de tubo reto. Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-60 lgc-tablet-grid-60 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<h2><span>M\u00e9todo de comprimento equivalente<\/span><\/h2>\n<p><strong><span>O m\u00e9todo de comprimento equivalente<\/span><\/strong><span>\u00a0(\u00a0<\/span><strong><span>O\u00a0<\/span><\/strong><span><strong>m\u00e9todo\u00a0<\/strong><strong>L\u00a0<\/strong><strong><sub>e<\/sub><\/strong><strong>\u00a0\/ D<\/strong>\u00a0) permite ao usu\u00e1rio descrever a\u00a0<\/span><a title=\"Menor Perda de Cabe\u00e7a - Perdas Locais\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/minor-head-loss-local-losses\/\"><span>perda de press\u00e3o<\/span><\/a><span>\u00a0atrav\u00e9s de um cotovelo ou acess\u00f3rio como um\u00a0<\/span><strong><span>comprimento de tubo reto<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>Este m\u00e9todo baseia-se na observa\u00e7\u00e3o de que as principais perdas tamb\u00e9m s\u00e3o proporcionais \u00e0\u00a0<\/span><a title=\"Cabe\u00e7a de velocidade\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/bernoullis-equation-bernoullis-principle\/velocity-head\/\"><span>cabe\u00e7a de velocidade<\/span><\/a><span>\u00a0(\u00a0<\/span><strong><em><span>v\u00a0<\/span><\/em><em><sup><span>2<\/span><\/sup><\/em><em><span>\u00a0\/ 2g<\/span><\/em><\/strong><span>\u00a0).<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/equivalent-length-method.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14695 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/equivalent-length-method.png\" alt=\"m\u00e9todo de comprimento equivalente\" width=\"166\" height=\"62\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/equivalent-length-method.png\" \/><\/a><\/p>\n<p><span>O\u00a0m\u00e9todo\u00a0L\u00a0<\/span><sub><span>e<\/span><\/sub><span>\u00a0\/ D\u00a0<\/span><strong><span>simplesmente aumenta o fator multiplicador<\/span><\/strong><span>\u00a0na\u00a0<\/span><a title=\"Equa\u00e7\u00e3o de Darcy-Weisbach\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/darcy-weisbach-equation\/\"><strong><span>equa\u00e7\u00e3o de Darcy-Weisbach<\/span><\/strong><\/a><span>\u00a0(ou seja,\u00a0<strong><em>L \/ D<\/em><\/strong>\u00a0) por um comprimento de tubo reto (ou seja,\u00a0<em>L\u00a0<\/em><em><sub>e<\/sub><\/em>\u00a0), o que daria origem a uma perda de press\u00e3o equivalente \u00e0s perdas na acess\u00f3rios, da\u00ed o nome \u201ccomprimento equivalente\u201d.\u00a0O fator multiplicador torna-se, portanto,\u00a0<strong><em>\u0192 (L + L\u00a0<\/em><\/strong><strong><em><sub>e<\/sub><\/em><\/strong><strong><em>\u00a0) \/ D<\/em><\/strong>\u00a0e a equa\u00e7\u00e3o para o c\u00e1lculo da perda de press\u00e3o do sistema \u00e9, portanto:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/equivalent-length.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14694 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/equivalent-length.png\" alt=\"comprimento equivalente\" width=\"235\" height=\"78\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/equivalent-length.png\" \/><\/a><span>Todos os acess\u00f3rios, cotovelos, T, podem ser somados para formar\u00a0<\/span><strong><span>um comprimento total<\/span><\/strong><span>\u00a0e a perda de press\u00e3o calculada a partir desse comprimento.\u00a0<\/span><strong><span>Verificou-se experimentalmente<\/span><\/strong><span>\u00a0que se os comprimentos equivalentes para uma variedade de tamanhos de um determinado tipo de acess\u00f3rio s\u00e3o divididos pelos\u00a0<\/span><strong><span>di\u00e2metros<\/span><\/strong><span>\u00a0dos acess\u00f3rios, ent\u00e3o\u00a0\u00e9 obtida\u00a0uma rela\u00e7\u00e3o quase constante (isto \u00e9, L\u00a0<\/span><sub><span>e<\/span><\/sub><span>\u00a0\/ D).\u00a0A vantagem do m\u00e9todo de comprimento equivalente \u00e9 que um \u00fanico valor de dados \u00e9 suficiente para\u00a0<\/span><strong><span>cobrir todos os tamanhos<\/span><\/strong><span>\u00a0desse acess\u00f3rio e, portanto, a tabula\u00e7\u00e3o de dados de comprimento equivalente \u00e9 relativamente f\u00e1cil.\u00a0Alguns comprimentos equivalentes t\u00edpicos s\u00e3o mostrados na tabela.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a href=\"http:\/\/www.katmarsoftware.com\/articles\/pipe-fitting-equivalent-length.htm\"><span>Software de dimensionamento de tubos e c\u00e1lculo de fluxo<\/span><\/a><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/table-of-equivalent-lengths-valves-elbows-bends.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14693 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/table-of-equivalent-lengths-valves-elbows-bends.png\" alt=\"tabela de comprimentos equivalentes - v\u00e1lvulas, cotovelos, curvas\" width=\"260\" height=\"256\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/table-of-equivalent-lengths-valves-elbows-bends.png\" \/><\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-40 lgc-tablet-grid-40 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\">\n<h2><span>Resumo:<\/span><\/h2>\n<ul>\n<li><span>A perda de carga do sistema hidr\u00e1ulico \u00e9 dividida em\u00a0<\/span><strong><span>duas categorias principais<\/span><\/strong><span>\u00a0:<\/span>\n<ul>\n<li><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\/\"><strong><span>Perda de Cabe\u00e7a Maior<\/span><\/strong><\/a><span>\u00a0&#8211; devido ao atrito em tubos retos<\/span><\/li>\n<li><a title=\"Menor Perda de Cabe\u00e7a - Perdas Locais\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/minor-head-loss-local-losses\/\"><strong><span>Menor perda de carga<\/span><\/strong><\/a><span>\u00a0&#8211; devido a componentes como v\u00e1lvulas, curvas\u2026<\/span><\/li>\n<\/ul>\n<\/li>\n<li><span>Uma\u00a0<\/span><strong><span>forma especial da equa\u00e7\u00e3o de Darcy<\/span><\/strong><span>\u00a0pode ser usada para calcular\u00a0<\/span><strong><span>pequenas perdas<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><span>As perdas menores s\u00e3o aproximadamente proporcional ao\u00a0<\/span><strong><span>quadrado da taxa de fluxo<\/span><\/strong><span>\u00a0e, portanto, eles podem ser facilmente integrados na equa\u00e7\u00e3o de Darcy-Weisbach atrav\u00e9s de\u00a0<\/span><strong><span>coeficiente de resist\u00eancia K<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><span>Como uma perda de press\u00e3o local, a\u00a0<\/span><strong><span>acelera\u00e7\u00e3o do fluido em um canal aquecido<\/span><\/strong><span>\u00a0tamb\u00e9m pode ser considerada.<\/span><\/li>\n<\/ul>\n<p><span>Existem os seguintes m\u00e9todos:<\/span><\/p>\n<ul>\n<li><strong><span>M\u00e9todo de comprimento equivalente<\/span><\/strong><\/li>\n<li><strong><span>M\u00e9todo K (m\u00e9todo coeficiente de resist\u00eancia)<\/span><\/strong><\/li>\n<li><strong><span>M\u00e9todo 2K<\/span><\/strong><\/li>\n<li><strong><span>M\u00e9todo 3K<\/span><\/strong><\/li>\n<\/ul>\n<h2><span>Por que a perda de cabe\u00e7a \u00e9 muito importante?<\/span><\/h2>\n<p><span>Como pode ser visto na figura, a perda de carga \u00e9 a\u00a0<\/span><strong><span>principal caracter\u00edstica<\/span><\/strong><span>\u00a0de qualquer sistema hidr\u00e1ulico.\u00a0Nos sistemas em que uma certa vaz\u00e3o deve ser mantida (por exemplo, para fornecer refrigera\u00e7\u00e3o ou transfer\u00eancia de calor suficiente a partir do\u00a0<\/span><a title=\"N\u00facleo do reator\" href=\"https:\/\/www.reactor-physics.com\/what-is-reactor-core-definition\/\"><span>n\u00facleo do reator<\/span><\/a><span>\u00a0),\u00a0<\/span><strong><span>o equil\u00edbrio<\/span><\/strong><span>\u00a0da\u00a0<\/span><strong><span>perda de carga<\/span><\/strong><span>\u00a0e da\u00a0\u00a0<\/span><strong><span>carga adicionada<\/span><\/strong><span>\u00a0por uma bomba determina a vaz\u00e3o atrav\u00e9s do sistema.<\/span><\/p>\n<figure id=\"attachment_14299\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-14299\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Hydraulic-Head-Q-H.png\"><img loading=\"lazy\" class=\"size-medium wp-image-14299 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Hydraulic-Head-Q-H-300x207.png\" alt=\"Diagrama caracter\u00edstico de QH da bomba centr\u00edfuga e do gasoduto\" width=\"300\" height=\"207\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Hydraulic-Head-Q-H-300x207.png\" \/><\/a><figcaption id=\"caption-attachment-14299\" class=\"wp-caption-text\"><span>Diagrama caracter\u00edstico de QH da bomba centr\u00edfuga e do gasoduto<\/span><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div>\n<p>&nbsp;<\/p>\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 m\u00e9todo de comprimento equivalente (O m\u00e9todo Le \/ D) permite ao usu\u00e1rio descrever a perda de press\u00e3o atrav\u00e9s de um cotovelo ou acess\u00f3rio como um comprimento de tubo reto. Engenharia T\u00e9rmica M\u00e9todo de comprimento equivalente O m\u00e9todo de comprimento equivalente\u00a0(\u00a0O\u00a0m\u00e9todo\u00a0L\u00a0e\u00a0\/ D\u00a0) permite ao usu\u00e1rio descrever a\u00a0perda de press\u00e3o\u00a0atrav\u00e9s de um cotovelo ou acess\u00f3rio como &#8230; <a title=\"O que \u00e9 o m\u00e9todo de comprimento de tubo equivalente &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-metodo-de-comprimento-de-tubo-equivalente-definicao\/\" aria-label=\"More on O que \u00e9 o m\u00e9todo de comprimento de tubo equivalente &#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 o m\u00e9todo de comprimento de tubo equivalente - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O m\u00e9todo de comprimento equivalente (O m\u00e9todo Le \/ D) permite ao usu\u00e1rio descrever a perda de press\u00e3o atrav\u00e9s de um cotovelo ou acess\u00f3rio como um comprimento de tubo reto. 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