{"id":49053,"date":"2019-11-14T07:39:38","date_gmt":"2019-11-14T06:39:38","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-fluxo-atraves-do-cotovelo-perda-menor-definicao\/"},"modified":"2020-02-01T16:29:46","modified_gmt":"2020-02-01T15:29:46","slug":"o-que-e-fluxo-atraves-do-cotovelo-perda-menor-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-atraves-do-cotovelo-perda-menor-definicao\/","title":{"rendered":"O que \u00e9 fluxo atrav\u00e9s do cotovelo &#8211; perda menor &#8211; defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">O fluxo atrav\u00e9s dos cotovelos \u00e9 bastante complicado. De fato, qualquer tubo curvo sempre induz uma perda maior do que o simples tubo reto. Fluxo atrav\u00e9s do cotovelo<\/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>Fluxo atrav\u00e9s do cotovelo &#8211; perda menor<\/span><\/h2>\n<p><span>O fluxo atrav\u00e9s dos cotovelos \u00e9 bastante\u00a0<\/span><strong><span>complicado<\/span><\/strong><span>\u00a0.\u00a0De fato, qualquer tubo curvo sempre induz uma perda maior do que o simples tubo reto.\u00a0Isso ocorre pelo fato de que em um tubo curvo o\u00a0<\/span><strong><span>fluxo se separa<\/span><\/strong><span>\u00a0nas paredes curvas.\u00a0Para um raio de curvatura muito pequeno, o fluxo de entrada \u00e9 at\u00e9 incapaz de fazer a curva na curva; portanto, o fluxo se separa e\u00a0<\/span><strong><span>em parte estagna<\/span><\/strong><span>\u00a0contra o lado oposto do tubo.\u00a0Nesta parte da curva, a press\u00e3o aumenta (como resultado\u00a0<\/span><a title=\"Equa\u00e7\u00e3o de Bernoulli - Princ\u00edpio de Bernoulli\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-equacao-de-bernoulli-principio-de-bernoulli-definicao\/\"><span>do princ\u00edpio de Bernoulli<\/span><\/a><span>\u00a0) e a velocidade diminui.<\/span><\/p>\n<p><span>Uma caracter\u00edstica interessante dos\u00a0<\/span><a title=\"M\u00e9todo do coeficiente de resist\u00eancia - M\u00e9todo K - Excesso de cabe\u00e7a\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/minor-head-loss-local-losses\/resistance-coefficient-method-k-method-excess-head\/\"><strong><span>valores K<\/span><\/strong><\/a><span>\u00a0para cotovelos \u00e9 o seu\u00a0<\/span><strong><span>comportamento n\u00e3o mon\u00f3tono \u00e0<\/span><\/strong><span>\u00a0medida que a\u00a0<\/span><strong><span>raz\u00e3o R \/ D<\/span><\/strong><span>\u00a0aumenta.\u00a0Os valores K incluem as perdas locais e as perdas por atrito do tubo.\u00a0As perdas locais, causadas pela separa\u00e7\u00e3o de fluxo e fluxo secund\u00e1rio, diminuem com R \/ D, enquanto as perdas por atrito aumentam porque o comprimento da dobra aumenta.\u00a0Portanto, h\u00e1 um\u00a0<\/span><strong><span>m\u00ednimo no valor K<\/span><\/strong><span>\u00a0pr\u00f3ximo ao raio de curvatura normalizado de 3.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-through-elbow-minor-loss.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14687 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-through-elbow-minor-loss.png\" alt=\"fluxo atrav\u00e9s do cotovelo - perda menor\" width=\"252\" height=\"498\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-through-elbow-minor-loss.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><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 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-accordion\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-arrow\" data-anchor=\"References\">\n<div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/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 fluxo atrav\u00e9s dos cotovelos \u00e9 bastante complicado. De fato, qualquer tubo curvo sempre induz uma perda maior do que o simples tubo reto. Fluxo atrav\u00e9s do cotovelo Fluxo atrav\u00e9s do cotovelo &#8211; perda menor O fluxo atrav\u00e9s dos cotovelos \u00e9 bastante\u00a0complicado\u00a0.\u00a0De fato, qualquer tubo curvo sempre induz uma perda maior do que o simples &#8230; <a title=\"O que \u00e9 fluxo atrav\u00e9s do cotovelo &#8211; perda menor &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-atraves-do-cotovelo-perda-menor-definicao\/\" aria-label=\"More on O que \u00e9 fluxo atrav\u00e9s do cotovelo &#8211; perda menor &#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 atrav\u00e9s do cotovelo - perda menor - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O fluxo atrav\u00e9s dos cotovelos \u00e9 bastante complicado. 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