{"id":49049,"date":"2019-11-14T07:21:52","date_gmt":"2019-11-14T06:21:52","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-o-metodo-2k-metodo-3k-queda-de-pressao-local-definicao\/"},"modified":"2020-02-01T16:28:25","modified_gmt":"2020-02-01T15:28:25","slug":"o-que-e-o-metodo-2k-metodo-3k-queda-de-pressao-local-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-metodo-2k-metodo-3k-queda-de-pressao-local-definicao\/","title":{"rendered":"O que \u00e9 o M\u00e9todo 2K &#8211; M\u00e9todo 3K &#8211; Queda de press\u00e3o local &#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 2-K \u00e9 vantajoso em rela\u00e7\u00e3o a outro m\u00e9todo, especialmente na regi\u00e3o de fluxo laminar. O m\u00e9todo 3K \u00e9 particularmente preciso para um sistema com acess\u00f3rios grandes. Engenharia T\u00e9rmica<\/div>\n<\/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 2K &#8211; M\u00e9todo 3K<\/span><\/h2>\n<p><span>O valor K representa o\u00a0<\/span><strong><span>m\u00faltiplo de\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\u00e7otes<\/span><\/a><\/strong><span><strong>\u00a0de\u00a0<\/strong><strong><a title=\"Cabe\u00e7a de velocidade\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/bernoullis-equation-bernoullis-principle\/velocity-head\/\">velocidade<\/a><\/strong>\u00a0que ser\u00e3o perdidos pelo fluido que passa pelo acess\u00f3rio.\u00a0A equa\u00e7\u00e3o para o c\u00e1lculo da perda de press\u00e3o do elemento hidr\u00e1ulico \u00e9, portanto:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/K-value-method.png\"><img loading=\"lazy\" class=\"size-full wp-image-14691 aligncenter lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/K-value-method.png\" alt=\"M\u00e9todo do valor K\" width=\"133\" height=\"63\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/K-value-method.png\" \/><\/a><span>Portanto, a equa\u00e7\u00e3o para o c\u00e1lculo da perda de press\u00e3o de todo o sistema hidr\u00e1ulico \u00e9:<\/span><br \/>\n<a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/K-value-head-loss.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14690 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/K-value-head-loss.png\" alt=\"Valor K - perda de carga\" width=\"240\" height=\"61\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/K-value-head-loss.png\" \/><\/a><br \/>\n<span>O\u00a0<\/span><strong><span>valor K<\/span><\/strong><span>\u00a0pode ser caracterizado para v\u00e1rios\u00a0<\/span><a title=\"Regime de fluxo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/flow-regime\/\"><span>regimes de fluxo<\/span><\/a><span>\u00a0(isto \u00e9, de acordo com o\u00a0<\/span><a title=\"N\u00famero de Reynolds\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/reynolds-number\/\"><span>n\u00famero de Reynolds<\/span><\/a><span>\u00a0) e isso faz com que seja mais preciso que o m\u00e9todo de comprimento equivalente.<\/span><\/p>\n<p><span>Existem v\u00e1rios outros m\u00e9todos para calcular a perda de press\u00e3o para conex\u00f5es, esses m\u00e9todos s\u00e3o\u00a0<\/span><strong><span>mais sofisticados<\/span><\/strong><span>\u00a0e tamb\u00e9m\u00a0<\/span><strong><span>mais precisos<\/span><\/strong><span>\u00a0:<\/span><\/p>\n<ul>\n<li><strong><span>M\u00e9todo 2K<\/span><\/strong><span>\u00a0.\u00a0O m\u00e9todo 2K \u00e9 uma t\u00e9cnica desenvolvida por Hooper BW para prever a perda de carga em um cotovelo, v\u00e1lvula ou T.\u00a0O m\u00e9todo 2K aprimora o m\u00e9todo do excesso de cabe\u00e7a, caracterizando a altera\u00e7\u00e3o na perda de press\u00e3o devido \u00e0\u00a0<\/span><strong><span>varia\u00e7\u00e3o do n\u00famero de Reynolds<\/span><\/strong><span>\u00a0.\u00a0O m\u00e9todo 2-K \u00e9 vantajoso em rela\u00e7\u00e3o a outro m\u00e9todo, especialmente na\u00a0<\/span><a title=\"Fluxo Laminar - Fluxo Viscoso\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-laminar-fluxo-viscoso-definicao\/\"><strong><span>regi\u00e3o de fluxo laminar<\/span><\/strong><\/a><span>\u00a0.<\/span><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/2K-method.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14689 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/2K-method.png\" alt=\"M\u00e9todo 2K\" width=\"199\" height=\"49\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/2K-method.png\" \/><\/a><\/li>\n<\/ul>\n<ul>\n<li><strong><span>M\u00e9todo 3K<\/span><\/strong><span>\u00a0.\u00a0O m\u00e9todo 3K (de Ron Darby em 1999) melhora ainda mais a precis\u00e3o do c\u00e1lculo da perda de press\u00e3o, caracterizando tamb\u00e9m a\u00a0<\/span><strong><span>mudan\u00e7a nas propor\u00e7\u00f5es geom\u00e9tricas<\/span><\/strong><span>\u00a0de um acess\u00f3rio conforme o tamanho muda.\u00a0Isso torna o m\u00e9todo 3K particularmente\u00a0<\/span><strong><span>preciso para um sistema com acess\u00f3rios grandes<\/span><\/strong><span>\u00a0.<\/span><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/3K-method.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14688 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/3K-method.png\" alt=\"M\u00e9todo 3K\" width=\"215\" height=\"58\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/3K-method.png\" \/><\/a><\/li>\n<\/ul>\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><strong><span>Perda de Cabe\u00e7a Maior<\/span><\/strong><span>\u00a0&#8211; devido ao atrito em tubos retos<\/span><\/li>\n<li><strong><span>Menor perda de carga<\/span><\/strong><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><\/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 m\u00e9todo 2-K \u00e9 vantajoso em rela\u00e7\u00e3o a outro m\u00e9todo, especialmente na regi\u00e3o de fluxo laminar. O m\u00e9todo 3K \u00e9 particularmente preciso para um sistema com acess\u00f3rios grandes. Engenharia T\u00e9rmica M\u00e9todo 2K &#8211; M\u00e9todo 3K O valor K representa o\u00a0m\u00faltiplo de\u00a0cabe\u00e7otes\u00a0de\u00a0velocidade\u00a0que ser\u00e3o perdidos pelo fluido que passa pelo acess\u00f3rio.\u00a0A equa\u00e7\u00e3o para o c\u00e1lculo da perda &#8230; <a title=\"O que \u00e9 o M\u00e9todo 2K &#8211; M\u00e9todo 3K &#8211; Queda de press\u00e3o local &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-metodo-2k-metodo-3k-queda-de-pressao-local-definicao\/\" aria-label=\"More on O que \u00e9 o M\u00e9todo 2K &#8211; M\u00e9todo 3K &#8211; Queda de press\u00e3o local &#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 2K - M\u00e9todo 3K - Queda de press\u00e3o local - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O m\u00e9todo 2-K \u00e9 vantajoso em rela\u00e7\u00e3o a outro m\u00e9todo, especialmente na regi\u00e3o de fluxo laminar. 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