{"id":49113,"date":"2019-11-14T15:07:51","date_gmt":"2019-11-14T14:07:51","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-camada-limite-turbulenta-definicao\/"},"modified":"2020-02-01T20:14:04","modified_gmt":"2020-02-01T19:14:04","slug":"o-que-e-camada-limite-turbulenta-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-camada-limite-turbulenta-definicao\/","title":{"rendered":"O que \u00e9 Camada Limite Turbulenta – Defini\u00e7\u00e3o"},"content":{"rendered":"
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Camada limite turbulenta.\u00a0As camadas de limite podem ser laminares ou turbulentas, dependendo do valor do n\u00famero de Reynolds.\u00a0Para alto n\u00famero de Reynolds, a camada limite \u00e9 turbulenta.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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Camada limite turbulenta<\/h2>\n

O conceito de\u00a0camadas limite<\/strong><\/a>\u00a0\u00e9 importante em toda a din\u00e2mica de fluidos viscosos, aerodin\u00e2mica e tamb\u00e9m na teoria da transfer\u00eancia de calor.\u00a0As caracter\u00edsticas b\u00e1sicas de todas as camadas limite laminar e turbulenta s\u00e3o mostradas no fluxo em desenvolvimento sobre uma placa plana.\u00a0Os est\u00e1gios da forma\u00e7\u00e3o da camada limite s\u00e3o mostrados na figura abaixo:<\/p>\n

\"Camada<\/a><\/p>\n

As camadas de limite<\/strong>\u00a0podem ser\u00a0laminares<\/strong>\u00a0ou\u00a0turbulentas,<\/strong>\u00a0dependendo do valor do\u00a0n\u00famero de Reynolds<\/strong>\u00a0.\u00a0Tamb\u00e9m aqui o n\u00famero de Reynolds representa a raz\u00e3o entre for\u00e7as de in\u00e9rcia e for\u00e7as viscosas e \u00e9 um par\u00e2metro conveniente para prever se uma condi\u00e7\u00e3o de fluxo ser\u00e1 laminar ou turbulenta.\u00a0\u00c9 definido como:<\/p>\n

\"N\u00famero<\/a><\/p>\n

em que V \u00e9 a velocidade m\u00e9dia do fluxo, D uma dimens\u00e3o linear caracter\u00edstica, \u03c1 densidade do fluido, \u03bc viscosidade din\u00e2mica e \u03bd viscosidade cinem\u00e1tica.<\/p>\n

Para\u00a0n\u00fameros de Reynolds mais baixos<\/strong>\u00a0, a camada limite \u00e9 laminar e a velocidade no sentido do fluxo muda uniformemente \u00e0 medida que se afasta da parede, conforme mostrado no lado esquerdo da figura.\u00a0\u00c0 medida que o n\u00famero de Reynolds aumenta<\/strong>\u00a0(com x), o\u00a0fluxo se torna inst\u00e1vel<\/strong>\u00a0e, finalmente, para n\u00fameros mais altos de Reynolds, a camada limite \u00e9 turbulenta e a velocidade do fluxo \u00e9 caracterizada por fluxos inst\u00e1veis \u200b\u200b(mudando com o tempo) dentro da camada limite.<\/p>\n

A transi\u00e7\u00e3o da<\/strong>\u00a0camada limite\u00a0laminar para a turbulenta<\/strong>\u00a0ocorre quando o n\u00famero de Reynolds em x excede\u00a0Re\u00a0x<\/sub>\u00a0~ 500.000<\/strong>\u00a0.\u00a0A transi\u00e7\u00e3o pode ocorrer mais cedo, mas depende principalmente da\u00a0rugosidade<\/strong>\u00a0da\u00a0superf\u00edcie<\/strong>\u00a0.\u00a0A camada limite turbulenta espessa mais rapidamente do que a camada limite laminar como resultado do aumento da tens\u00e3o de cisalhamento na superf\u00edcie do corpo.<\/p>\n

Veja tamb\u00e9m:\u00a0Espessura da camada limite<\/a><\/p>\n

Veja tamb\u00e9m:\u00a0Tubo em fluxo cruzado – fluxo externo<\/a><\/p>\n

Refer\u00eancia especial:<\/strong>\u00a0Schlichting Herrmann, Gersten Klaus.\u00a0Teoria da camada limite, Springer-Verlag Berlin Heidelberg, 2000, ISBN: 978-3-540-66270-9<\/p>\n<\/div>\n<\/div>\n

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……………………………………………………………………………………………………………………………….<\/p>\n

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","protected":false},"excerpt":{"rendered":"

Camada limite turbulenta.\u00a0As camadas de limite podem ser laminares ou turbulentas, dependendo do valor do n\u00famero de Reynolds.\u00a0Para alto n\u00famero de Reynolds, a camada limite \u00e9 turbulenta.\u00a0Engenharia T\u00e9rmica Camada limite turbulenta O conceito de\u00a0camadas limite\u00a0\u00e9 importante em toda a din\u00e2mica de fluidos viscosos, aerodin\u00e2mica e tamb\u00e9m na teoria da transfer\u00eancia de calor.\u00a0As caracter\u00edsticas b\u00e1sicas de … 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 Camada Limite Turbulenta - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Camada limite turbulenta. As camadas de limite podem ser laminares ou turbulentas, dependendo do valor do n\u00famero de Reynolds. 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