{"id":47475,"date":"2019-11-05T03:19:56","date_gmt":"2019-11-05T02:19:56","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-a-equacao-de-gnielinski-definicao\/"},"modified":"2020-01-23T14:39:46","modified_gmt":"2020-01-23T13:39:46","slug":"o-que-e-a-equacao-de-gnielinski-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-equacao-de-gnielinski-definicao\/","title":{"rendered":"O que \u00e9 a equa\u00e7\u00e3o de Gnielinski – Defini\u00e7\u00e3o"},"content":{"rendered":"
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Equa\u00e7\u00e3o de Gnielinski.\u00a0A equa\u00e7\u00e3o de Gnielinski \u00e9 uma correla\u00e7\u00e3o mais complexa, v\u00e1lida para tubos em uma grande variedade de n\u00fameros de Reynolds, incluindo a regi\u00e3o de transi\u00e7\u00e3o.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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Equa\u00e7\u00e3o de Gnielinski<\/h2>\n

Embora as\u00a0equa\u00e7\u00f5es de Dittus-Boelter<\/strong>\u00a0e\u00a0Sieder-Tate<\/strong>\u00a0sejam facilmente aplicadas e certamente sejam satisfat\u00f3rias para os fins deste artigo, erros de at\u00e9 25% podem resultar de seu uso.\u00a0Tais erros podem ser reduzidos pelo uso de correla\u00e7\u00f5es mais recentes, mas geralmente mais complexas, como a\u00a0correla\u00e7\u00e3o de Gnielinski<\/strong>\u00a0.\u00a0Esta equa\u00e7\u00e3o \u00e9 v\u00e1lida para tubos em uma grande variedade de n\u00fameros de Reynolds, incluindo a regi\u00e3o de transi\u00e7\u00e3o.<\/p>\n

\"Equa\u00e7\u00e3o<\/a><\/p>\n

O fator de atrito de Darcy<\/a>\u00a0, f,<\/strong>\u00a0\u00a0\u00e9 uma quantidade adimensional usada na\u00a0equa\u00e7\u00e3o de Darcy-Weisbach<\/a>\u00a0, para a descri\u00e7\u00e3o de\u00a0perdas por atrito<\/a>\u00a0em tubula\u00e7\u00e3o ou duto, bem como para fluxo em canal aberto.\u00a0Isso tamb\u00e9m \u00e9 chamado de\u00a0\u00a0fator de atrito de Darcy-Weisbach<\/strong>\u00a0,\u00a0\u00a0coeficiente de resist\u00eancia<\/strong>\u00a0ou simplesmente\u00a0\u00a0fator de atrito<\/strong>\u00a0.<\/p>\n

Tubos de parede \u00e1spera<\/strong><\/p>\n

Tamb\u00e9m observamos que todas essas equa\u00e7\u00f5es pertencem a tubos lisos.\u00a0Para fluxo turbulento em tubos rugosos, o coeficiente de transfer\u00eancia de calor aumenta com a\u00a0rugosidade da parede<\/a>\u00a0.\u00a0\u00c0 medida que o\u00a0n\u00famero de Reynolds<\/a>\u00a0aumenta, a subcamada viscosa se torna mais fina e menor.\u00a0No n\u00famero Reynolds muito alto, a subcamada viscosa se torna 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.<\/p>\n

Refer\u00eancia Especial: Um Livro de Transfer\u00eancia de Calor, John H. Lienhard IV e John H. Lienhard V. Phlogiston Press, 2012.<\/p>\n<\/div>\n<\/div>\n

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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<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

Equa\u00e7\u00e3o de Gnielinski.\u00a0A equa\u00e7\u00e3o de Gnielinski \u00e9 uma correla\u00e7\u00e3o mais complexa, v\u00e1lida para tubos em uma grande variedade de n\u00fameros de Reynolds, incluindo a regi\u00e3o de transi\u00e7\u00e3o.\u00a0Engenharia T\u00e9rmica Equa\u00e7\u00e3o de Gnielinski Embora as\u00a0equa\u00e7\u00f5es de Dittus-Boelter\u00a0e\u00a0Sieder-Tate\u00a0sejam facilmente aplicadas e certamente sejam satisfat\u00f3rias para os fins deste artigo, erros de at\u00e9 25% podem resultar de seu uso.\u00a0Tais … 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":"\nO que \u00e9 a equa\u00e7\u00e3o de Gnielinski - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Equa\u00e7\u00e3o de Gnielinski. 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