{"id":49025,"date":"2019-11-14T04:48:13","date_gmt":"2019-11-14T03:48:13","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-rugosidade-relativa-do-tubo-definicao\/"},"modified":"2020-02-01T16:10:27","modified_gmt":"2020-02-01T15:10:27","slug":"o-que-e-rugosidade-relativa-do-tubo-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-rugosidade-relativa-do-tubo-definicao\/","title":{"rendered":"O que \u00e9 rugosidade relativa do tubo &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">A quantidade usada para medir a rugosidade da superf\u00edcie interna do tubo \u00e9 chamada de rugosidade relativa. \u00c9 igual \u00e0 altura das irregularidades da superf\u00edcie (\u03b5) dividida pelo di\u00e2metro do tubo (D). 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>Rugosidade relativa<\/span><\/h2>\n<p><span>A quantidade usada para medir a\u00a0<\/span><strong><span>rugosidade da superf\u00edcie interna do tubo<\/span><\/strong><span>\u00a0\u00e9 chamada de\u00a0<\/span><strong><span>rugosidade relativa<\/span><\/strong><span>\u00a0e \u00e9 igual \u00e0 altura m\u00e9dia das irregularidades da superf\u00edcie (\u03b5) dividida pelo di\u00e2metro do tubo (D).<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relative-roughness-equation.png\"><img loading=\"lazy\" class=\"wp-image-14577 aligncenter lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relative-roughness-equation.png\" alt=\"rugosidade relativa - equa\u00e7\u00e3o\" width=\"243\" height=\"64\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relative-roughness-equation.png\" \/><\/a><\/p>\n<p><span>, onde as irregularidades m\u00e9dias da superf\u00edcie da altura e o di\u00e2metro do tubo est\u00e3o em mil\u00edmetros.<\/span><\/p>\n<p><span>Se conhecermos a rugosidade relativa da superf\u00edcie interna do tubo, podemos obter o valor do\u00a0<\/span><strong><span>fator de atrito<\/span><\/strong><span>\u00a0no\u00a0<\/span><strong><span>Gr\u00e1fico Moody<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>O gr\u00e1fico Moody (tamb\u00e9m conhecido como diagrama Moody) \u00e9 um gr\u00e1fico em forma n\u00e3o dimensional que relaciona\u00a0<\/span><strong><span>o fator de atrito de Darcy<\/span><\/strong><span>\u00a0, o\u00a0<\/span><strong><span>n\u00famero de Reynolds<\/span><\/strong><span>\u00a0e a\u00a0<\/span><strong><span>rugosidade relativa do<\/span><\/strong><span>\u00a0fluxo totalmente desenvolvido em um tubo circular.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relative-roughness-absolute-roughness-friction-min.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14587 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relative-roughness-absolute-roughness-friction-min.png\" alt=\"rugosidade relativa - rugosidade absoluta\" width=\"390\" height=\"691\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relative-roughness-absolute-roughness-friction-min.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><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>A equa\u00e7\u00e3o de Darcy<\/span><\/strong><\/a><span>\u00a0pode ser usada para calcular<\/span><strong><span>\u00a0grandes perdas<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><a title=\"Fator de atrito de Darcy\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-fator-de-atrito-de-darcy-definicao\/\"><span>O\u00a0<\/span><strong><span>fator de atrito<\/span><\/strong><\/a><span>\u00a0para o fluxo de fluido pode ser determinado usando um\u00a0<\/span><a title=\"Moody Diagram\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/moody-diagram\/\"><strong><span>gr\u00e1fico Moody<\/span><\/strong><\/a><span>\u00a0.<\/span><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Moody-chart-min.jpg\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-14429 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Moody-chart-min-300x188.jpg\" alt=\"Moody chart-min\" width=\"300\" height=\"188\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Moody-chart-min-300x188.jpg\" \/><\/a><\/li>\n<li><a title=\"Fator de atrito para fluxo laminar\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/friction-factor-for-laminar-flow\/\"><strong><span>O fator de atrito<\/span><\/strong><span>\u00a0\u00a0para o fluxo laminar<\/span><\/a><span>\u00a0\u00e9<\/span><strong><span>\u00a0independente da rugosidade<\/span><\/strong><span>\u00a0da superf\u00edcie interna do tubo.\u00a0<\/span><strong><span>f = 64 \/ Re<\/span><\/strong><\/li>\n<li><a title=\"Fator de atrito para escoamento turbulento - Equa\u00e7\u00e3o de Colebrook\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/friction-factor-turbulent-flow-colebrook\/\"><strong><span>O fator de atrito<\/span><\/strong><span>\u00a0\u00a0para escoamento turbulento<\/span><\/a><span>\u00a0\u00a0depende fortemente da<\/span><strong><a title=\"Rugosidade relativa do tubo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/relative-roughness-of-pipe\/\"><span>\u00a0rugosidade relativa<\/span><\/a><span>\u00a0.\u00a0<\/span><\/strong><span>\u00c9 determinado pela equa\u00e7\u00e3o de Colebrook.\u00a0Deve-se notar que,<\/span><strong><span>\u00a0em n\u00fameros muito grandes de Reynolds<\/span><\/strong><span>\u00a0, o fator de atrito \u00e9 independente do n\u00famero de Reynolds.<\/span><\/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-divider su-divider-style-dotted\"><\/div>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/darcy-friction-factor-relative-roughness-min.png\"><img loading=\"lazy\" class=\"size-medium wp-image-14586 alignright lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/darcy-friction-factor-relative-roughness-min-285x300.png\" alt=\"fator de atrito darcy - rugosidade relativa\" width=\"285\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/darcy-friction-factor-relative-roughness-min-285x300.png\" \/><\/a><span>Deve-se notar que, em\u00a0<\/span><strong><span>n\u00fameros muito grandes de Reynolds<\/span><\/strong><span>\u00a0,\u00a0<\/span><strong><span>o fator de atrito \u00e9 independente do n\u00famero de Reynolds<\/span><\/strong><span>\u00a0.\u00a0Isso ocorre porque a espessura da subcamada laminar (subcamada viscosa) diminui com o aumento do n\u00famero de Reynolds.\u00a0Para n\u00fameros Reynolds muito grandes, a espessura da subcamada laminar \u00e9 compar\u00e1vel \u00e0 rugosidade da superf\u00edcie e influencia diretamente o fluxo.\u00a0A subcamada laminar torna-se t\u00e3o fina que a rugosidade da superf\u00edcie se projeta no fluxo.\u00a0As perdas por atrito neste caso s\u00e3o produzidas no fluxo principal principalmente pelos elementos de rugosidade salientes, e a contribui\u00e7\u00e3o da subcamada laminar \u00e9 insignificante.<\/span><\/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\"><\/div>\n<\/div>\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>A quantidade usada para medir a rugosidade da superf\u00edcie interna do tubo \u00e9 chamada de rugosidade relativa. \u00c9 igual \u00e0 altura das irregularidades da superf\u00edcie (\u03b5) dividida pelo di\u00e2metro do tubo (D). Engenharia T\u00e9rmica Rugosidade relativa A quantidade usada para medir a\u00a0rugosidade da superf\u00edcie interna do tubo\u00a0\u00e9 chamada de\u00a0rugosidade relativa\u00a0e \u00e9 igual \u00e0 altura m\u00e9dia &#8230; <a title=\"O que \u00e9 rugosidade relativa do tubo &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-rugosidade-relativa-do-tubo-definicao\/\" aria-label=\"More on O que \u00e9 rugosidade relativa do tubo &#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 rugosidade relativa do tubo - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A quantidade usada para medir a rugosidade da superf\u00edcie interna do tubo \u00e9 chamada de rugosidade relativa. \u00c9 igual \u00e0 altura das irregularidades da superf\u00edcie (\u03b5) dividida pelo di\u00e2metro do tubo (D). 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