{"id":47611,"date":"2019-11-05T16:23:01","date_gmt":"2019-11-05T15:23:01","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-condicao-de-limite-de-conveccao-definicao\/"},"modified":"2020-01-24T11:28:04","modified_gmt":"2020-01-24T10:28:04","slug":"o-que-e-condicao-de-limite-de-conveccao-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-condicao-de-limite-de-conveccao-definicao\/","title":{"rendered":"O que \u00e9 condi\u00e7\u00e3o de limite de convec\u00e7\u00e3o – Defini\u00e7\u00e3o"},"content":{"rendered":"
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Em problemas de transfer\u00eancia de calor, a condi\u00e7\u00e3o limite de convec\u00e7\u00e3o, tamb\u00e9m conhecida como condi\u00e7\u00e3o limite de Newton, corresponde \u00e0 exist\u00eancia de aquecimento por convec\u00e7\u00e3o (ou resfriamento) na superf\u00edcie e \u00e9 obtida a partir do balan\u00e7o energ\u00e9tico da superf\u00edcie.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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Condi\u00e7\u00e3o do limite de convec\u00e7\u00e3o<\/h2>\n

\"Condi\u00e7\u00e3o<\/a>Em problemas de transfer\u00eancia de calor, a condi\u00e7\u00e3o limite de convec\u00e7\u00e3o, tamb\u00e9m conhecida como\u00a0\u00a0condi\u00e7\u00e3o limite de Newton,<\/strong>\u00a0corresponde \u00e0 exist\u00eancia de aquecimento por convec\u00e7\u00e3o (ou resfriamento) na superf\u00edcie e \u00e9 obtida a partir do balan\u00e7o energ\u00e9tico da superf\u00edcie.\u00a0A condi\u00e7\u00e3o limite de convec\u00e7\u00e3o<\/strong>\u00a0\u00e9 provavelmente a condi\u00e7\u00e3o limite mais comum encontrada na pr\u00e1tica, pois a maioria das superf\u00edcies de transfer\u00eancia de calor \u00e9 exposta a um ambiente convectivo em par\u00e2metros especificados.<\/p>\n

Em outras palavras, essa condi\u00e7\u00e3o pressup\u00f5e que a condu\u00e7\u00e3o de calor na superf\u00edcie do material seja igual \u00e0 convec\u00e7\u00e3o de calor na superf\u00edcie na mesma dire\u00e7\u00e3o.\u00a0Como o limite n\u00e3o pode armazenar energia, o calor l\u00edquido que entra na superf\u00edcie pelo lado convectivo deve sair da superf\u00edcie pelo lado da condu\u00e7\u00e3o.<\/p>\n

Da mesma forma, a condi\u00e7\u00e3o de limite de radia\u00e7\u00e3o pode ser constru\u00edda e usada.<\/p>\n<\/div>\n<\/div>\n

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Equa\u00e7\u00e3o geral de condu\u00e7\u00e3o de calor<\/h2>\n

A\u00a0equa\u00e7\u00e3o de condu\u00e7\u00e3o de calor<\/strong>\u00a0\u00e9 uma equa\u00e7\u00e3o diferencial parcial que descreve a distribui\u00e7\u00e3o de\u00a0calor<\/strong>\u00a0(ou o\u00a0campo de temperatura<\/strong>\u00a0) em um determinado corpo ao longo do tempo.\u00a0O conhecimento detalhado do campo de temperatura \u00e9 muito importante na condu\u00e7\u00e3o t\u00e9rmica atrav\u00e9s de materiais.\u00a0Uma vez que essa distribui\u00e7\u00e3o de temperatura \u00e9 conhecida, o\u00a0fluxo de calor de condu\u00e7\u00e3o<\/strong>\u00a0em qualquer ponto do material ou em sua superf\u00edcie pode ser calculado pela\u00a0lei<\/a>\u00a0de\u00a0Fourier<\/a>\u00a0.<\/p>\n

A equa\u00e7\u00e3o do calor \u00e9\u00a0derivada\u00a0<\/strong>da lei<\/strong>\u00a0de\u00a0Fourier<\/strong>\u00a0e da\u00a0conserva\u00e7\u00e3o de energia<\/strong><\/a>\u00a0.\u00a0A lei de Fourier afirma que a\u00a0taxa de<\/strong>\u00a0tempo\u00a0de transfer\u00eancia de calor<\/strong>\u00a0atrav\u00e9s de um material \u00e9\u00a0proporcional ao\u00a0<\/strong>gradiente<\/strong>\u00a0negativo\u00a0na temperatura<\/strong>\u00a0e \u00e0 \u00e1rea, perpendicularmente \u00e0quele gradiente, atrav\u00e9s do qual o calor flui.<\/p>\n

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

Uma mudan\u00e7a na energia interna por unidade de volume no material, \u0394Q, \u00e9 proporcional \u00e0 mudan\u00e7a na temperatura, \u0394u.\u00a0Isso \u00e9:<\/p>\n

\u2206Q = \u03c1.c\u00a0<\/strong>p<\/sub><\/strong>\u00a0.\u2206T<\/strong><\/p>\n

Forma geral<\/strong><\/p>\n

Usando essas duas equa\u00e7\u00f5es, podemos derivar a equa\u00e7\u00e3o geral de condu\u00e7\u00e3o de calor:<\/span><\/p>\n

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

Essa equa\u00e7\u00e3o tamb\u00e9m \u00e9 conhecida como\u00a0<\/span>equa\u00e7\u00e3o de Fourier-Biot<\/span><\/strong>\u00a0e fornece a ferramenta b\u00e1sica para an\u00e1lise de condu\u00e7\u00e3o de calor.\u00a0A partir de sua solu\u00e7\u00e3o, podemos obter o campo de temperatura em fun\u00e7\u00e3o do tempo.<\/span><\/p>\n

Em palavras, a\u00a0<\/span>equa\u00e7\u00e3o de condu\u00e7\u00e3o de calor<\/span><\/strong>\u00a0afirma que:<\/span><\/p>\n

Em qualquer ponto do meio, a taxa l\u00edquida de transfer\u00eancia de energia por condu\u00e7\u00e3o em um volume unit\u00e1rio mais a taxa volum\u00e9trica de gera\u00e7\u00e3o de energia t\u00e9rmica deve ser igual \u00e0 taxa de varia\u00e7\u00e3o da energia t\u00e9rmica armazenada dentro do volume.<\/span><\/em><\/p>\n<\/div>\n<\/div>\n

……………………………………………………………………………………………………………………………….<\/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","protected":false},"excerpt":{"rendered":"

Em problemas de transfer\u00eancia de calor, a condi\u00e7\u00e3o limite de convec\u00e7\u00e3o, tamb\u00e9m conhecida como condi\u00e7\u00e3o limite de Newton, corresponde \u00e0 exist\u00eancia de aquecimento por convec\u00e7\u00e3o (ou resfriamento) na superf\u00edcie e \u00e9 obtida a partir do balan\u00e7o energ\u00e9tico da superf\u00edcie.\u00a0Engenharia T\u00e9rmica Condi\u00e7\u00e3o do limite de convec\u00e7\u00e3o Em problemas de transfer\u00eancia de calor, a condi\u00e7\u00e3o limite 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 condi\u00e7\u00e3o de limite de convec\u00e7\u00e3o - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Em problemas de transfer\u00eancia de calor, a condi\u00e7\u00e3o limite de convec\u00e7\u00e3o, tamb\u00e9m conhecida como condi\u00e7\u00e3o limite de Newton, corresponde \u00e0 exist\u00eancia de aquecimento por convec\u00e7\u00e3o (ou resfriamento) na superf\u00edcie e \u00e9 obtida a partir do balan\u00e7o energ\u00e9tico da superf\u00edcie. 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