{"id":48921,"date":"2019-11-13T19:23:38","date_gmt":"2019-11-13T18:23:38","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-cavitacao-por-succao-definicao\/"},"modified":"2020-02-01T09:23:02","modified_gmt":"2020-02-01T08:23:02","slug":"o-que-e-cavitacao-por-succao-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-cavitacao-por-succao-definicao\/","title":{"rendered":"O que \u00e9 cavita\u00e7\u00e3o por suc\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">A cavita\u00e7\u00e3o por suc\u00e7\u00e3o, ou tamb\u00e9m a cavita\u00e7\u00e3o cl\u00e1ssica, ocorre quando uma bomba est\u00e1 sob baixa press\u00e3o ou condi\u00e7\u00f5es de alto v\u00e1cuo.\u00a0Tamb\u00e9m \u00e9 chamado de cavita\u00e7\u00e3o NPSHa inadequada.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div class=\"su-divider su-divider-style-dotted\"><\/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-spacer\"><\/div>\n<h2>Cavita\u00e7\u00e3o por suc\u00e7\u00e3o<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/suction-cavitation-impeller-min.png\"><img loading=\"lazy\" class=\"alignright wp-image-15095 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/suction-cavitation-impeller-min.png\" alt=\"cavita\u00e7\u00e3o de suc\u00e7\u00e3o - impulsor-min\" width=\"364\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/suction-cavitation-impeller-min.png\" \/><\/a><strong>A cavita\u00e7\u00e3o por suc\u00e7\u00e3o<\/strong>\u00a0, ou tamb\u00e9m a\u00a0<strong>cavita\u00e7\u00e3o cl\u00e1ssica<\/strong>\u00a0, ocorre quando uma bomba est\u00e1 sob\u00a0<strong>baixa press\u00e3o<\/strong>\u00a0ou condi\u00e7\u00f5es de alto v\u00e1cuo.\u00a0Quando o l\u00edquido sendo bombeado entra no olho de uma\u00a0<a title=\"Bombas centr\u00edfugas\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-bomba-centrifuga-definicao\/\">bomba centr\u00edfuga<\/a>\u00a0,\u00a0<strong>a press\u00e3o \u00e9 significativamente reduzida<\/strong>\u00a0.\u00a0Em alguns casos, a queda de press\u00e3o \u00e9 grande o suficiente para fazer com que o l\u00edquido pisque ao vapor quando a\u00a0<strong>press\u00e3o local cai<\/strong>\u00a0abaixo da\u00a0<strong>press\u00e3o de satura\u00e7\u00e3o<\/strong>\u00a0do fluido que est\u00e1 sendo bombeado.\u00a0<strong>Bolhas ou cavidades<\/strong>\u00a0se formar\u00e3o no olho do impulsor e subseq\u00fcentemente as bolhas de vapor formadas se mover\u00e3o para\u00a0<strong>regi\u00f5es de press\u00e3o mais alta \u00e0<\/strong>\u00a0medida que viajam em dire\u00e7\u00e3o \u00e0 descarga da bomba.\u00a0Na regi\u00e3o de maior press\u00e3o, a<strong>bolhas de vapor colapsam repentinamente<\/strong>\u00a0nas partes externas do impulsor.\u00a0Isso pode causar danos significativos a todas as partes m\u00f3veis de uma bomba centr\u00edfuga.<\/p>\n<p><strong>Causas t\u00edpicas da cavita\u00e7\u00e3o por suc\u00e7\u00e3o:<\/strong><\/p>\n<ul>\n<li>A bomba est\u00e1 funcionando muito longe na\u00a0<a title=\"Cabe\u00e7a da bomba - curva de desempenho da bomba centr\u00edfuga\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/centrifugal-pumps\/pump-head-performance-curve\/\">curva da bomba<\/a><\/li>\n<li>M\u00e1s condi\u00e7\u00f5es de suc\u00e7\u00e3o (\u00a0<a title=\"Cabe\u00e7a de suc\u00e7\u00e3o positiva l\u00edquida\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/centrifugal-pumps\/net-positive-suction-head\/\">requisitos NPSH<\/a>\u00a0)<\/li>\n<li>Bloqueio no tubo no lado de suc\u00e7\u00e3o<\/li>\n<li>Projeto de tubula\u00e7\u00e3o inadequado<\/li>\n<li>Filtros ou filtros entupidos<\/li>\n<\/ul>\n<p>Para evitar esse tipo de cavita\u00e7\u00e3o, a\u00a0<strong>Cabe\u00e7a de Suc\u00e7\u00e3o Positiva L\u00edquida dispon\u00edvel (NPSHa)<\/strong>\u00a0no sistema deve ser\u00a0<strong>maior que<\/strong>\u00a0o\u00a0<strong>NPSH necess\u00e1rio<\/strong>\u00a0da bomba.\u00a0Esse problema \u00e9 t\u00edpico da cavita\u00e7\u00e3o por suc\u00e7\u00e3o e, portanto, esse tipo de cavita\u00e7\u00e3o tamb\u00e9m \u00e9 chamado de\u00a0<strong>cavita\u00e7\u00e3o NPSHa inadequada<\/strong>\u00a0.<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Net-Positive-Suction-Head-chart.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-15002 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Net-Positive-Suction-Head-chart.png\" alt=\"Cabe\u00e7a de suc\u00e7\u00e3o positiva l\u00edquida\" width=\"654\" height=\"356\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Net-Positive-Suction-Head-chart.png\" \/><\/a><\/p>\n<p><span>Al\u00e9m da troca da bomba, os problemas com a cavita\u00e7\u00e3o por suc\u00e7\u00e3o tamb\u00e9m podem ser resolvidos por:<\/span><\/p>\n<ol>\n<li><span>Baixando a temperatura<\/span><\/li>\n<li><span>Redu\u00e7\u00e3o da rota\u00e7\u00e3o do motor, se poss\u00edvel<\/span><\/li>\n<li><span>Aumento do di\u00e2metro do olho do impulsor<\/span><\/li>\n<li><span>Uso de um indutor de impulsor.<\/span><\/li>\n<li><span>Uso de duas bombas paralelas com menor capacidade.<\/span><\/li>\n<li><span>Uso de uma bomba auxiliar para alimentar a bomba principal.<\/span><\/li>\n<\/ol>\n<p><span>Caso especial de cavita\u00e7\u00e3o ocorre no lado da suc\u00e7\u00e3o como resultado de tubula\u00e7\u00e3o inadequada na linha de suc\u00e7\u00e3o.\u00a0O uso de restri\u00e7\u00f5es,\u00a0<\/span><a title=\"Fluxo atrav\u00e9s do cotovelo - perda menor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/minor-head-loss-local-losses\/flow-through-elbow-minor-loss-2\/\"><span>cotovelos<\/span><\/a><span>\u00a0afiados\u00a0e outros equipamentos hidr\u00e1ulicos podem\u00a0<\/span><a title=\"Fluxo turbulento\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-turbulento-definicao\/\"><strong><span>turbulizar o fluxo,<\/span><\/strong><\/a><span>\u00a0o que pode contribuir para a forma\u00e7\u00e3o de cavita\u00e7\u00e3o.<\/span><\/p>\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 cavita\u00e7\u00e3o por suc\u00e7\u00e3o, ou tamb\u00e9m a cavita\u00e7\u00e3o cl\u00e1ssica, ocorre quando uma bomba est\u00e1 sob baixa press\u00e3o ou condi\u00e7\u00f5es de alto v\u00e1cuo.\u00a0Tamb\u00e9m \u00e9 chamado de cavita\u00e7\u00e3o NPSHa inadequada.\u00a0Engenharia T\u00e9rmica Cavita\u00e7\u00e3o por suc\u00e7\u00e3o A cavita\u00e7\u00e3o por suc\u00e7\u00e3o\u00a0, ou tamb\u00e9m a\u00a0cavita\u00e7\u00e3o cl\u00e1ssica\u00a0, ocorre quando uma bomba est\u00e1 sob\u00a0baixa press\u00e3o\u00a0ou condi\u00e7\u00f5es de alto v\u00e1cuo.\u00a0Quando o l\u00edquido sendo bombeado &#8230; <a title=\"O que \u00e9 cavita\u00e7\u00e3o por suc\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-cavitacao-por-succao-definicao\/\" aria-label=\"More on O que \u00e9 cavita\u00e7\u00e3o por suc\u00e7\u00e3o &#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 cavita\u00e7\u00e3o por suc\u00e7\u00e3o - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A cavita\u00e7\u00e3o por suc\u00e7\u00e3o, ou tamb\u00e9m a cavita\u00e7\u00e3o cl\u00e1ssica, ocorre quando uma bomba est\u00e1 sob baixa press\u00e3o ou condi\u00e7\u00f5es de alto v\u00e1cuo. 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