{"id":47252,"date":"2019-11-03T18:59:05","date_gmt":"2019-11-03T17:59:05","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-condensacao-dropwise-definicao\/"},"modified":"2020-01-22T17:07:24","modified_gmt":"2020-01-22T16:07:24","slug":"o-que-e-condensacao-dropwise-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-condensacao-dropwise-definicao\/","title":{"rendered":"O que \u00e9 condensa\u00e7\u00e3o Dropwise – Defini\u00e7\u00e3o"},"content":{"rendered":"
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Condensa\u00e7\u00e3o gota a gota.\u00a0Na condensa\u00e7\u00e3o gota a gota, o vapor condensado forma got\u00edculas na superf\u00edcie em vez de um filme cont\u00ednuo.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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Condensa\u00e7\u00e3o gota a gota<\/h2>\n
\"Diagrama<\/a>
Diagrama de fases da \u00e1gua.
\nFonte: wikipedia.org CC BY-SA<\/figcaption><\/figure>\n

Da mesma forma que no cap\u00edtulo anterior, neste cap\u00edtulo, discutiremos a transfer\u00eancia de calor com a mudan\u00e7a de fase, mas, neste caso, discutiremos a\u00a0condensa\u00e7\u00e3o<\/strong>\u00a0da fase gasosa (mudan\u00e7a de fase de vapor para l\u00edquido).<\/p>\n

Em geral, a\u00a0condensa\u00e7\u00e3o<\/strong>\u00a0\u00e9 a mudan\u00e7a do estado f\u00edsico da mat\u00e9ria da fase gasosa para a fase l\u00edquida e \u00e9 o\u00a0inverso da vaporiza\u00e7\u00e3o<\/strong>\u00a0.\u00a0Os processos de fluxo associados \u00e0\u00a0condensa\u00e7\u00e3o<\/strong>\u00a0em uma superf\u00edcie s\u00f3lida s\u00e3o quase uma imagem espelhada dos envolvidos na fervura.\u00a0A condensa\u00e7\u00e3o ocorre quando a temperatura de um vapor \u00e9 reduzida abaixo da temperatura de satura\u00e7\u00e3o ou quando a press\u00e3o de um vapor \u00e9 aumentada acima dos par\u00e2metros de satura\u00e7\u00e3o (consulte o diagrama de fases da \u00e1gua).<\/p>\n

\"condensa\u00e7\u00e3o<\/a>Na\u00a0condensa\u00e7\u00e3o gota a gota<\/strong>\u00a0, o vapor condensado forma got\u00edculas na superf\u00edcie em vez de um filme cont\u00ednuo.\u00a0A condensa\u00e7\u00e3o gota a gota pode ocorrer quando a superf\u00edcie n\u00e3o est\u00e1\u00a0\u00a0molhando<\/strong>\u00a0\u00a0ou essas got\u00edculas s\u00e3o retiradas da superf\u00edcie por fluxo externo ou por gravidade.\u00a0O vapor est\u00e1 em contato direto com a superf\u00edcie na maior parte da \u00e1rea e as taxas de transfer\u00eancia de calor s\u00e3o muito maiores (mais de 3 a 10 vezes mais), pois h\u00e1 muito pouca resist\u00eancia ao fluxo de calor entre o vapor e a superf\u00edcie.\u00a0As got\u00edculas se desenvolvem nos locais de nuclea\u00e7\u00e3o (pontos de imperfei\u00e7\u00f5es da superf\u00edcie, como cavidades, arranh\u00f5es e cavidades) e crescem em tamanho \u00e0 medida que mais vapor condensa na superf\u00edcie exposta.\u00a0Para\u00a0\u00a0condensadores de vapor<\/strong><\/a>, \u00e9 pr\u00e1tica comum usar revestimentos de superf\u00edcie (silicons, teflons ou ceras) que inibem a umecta\u00e7\u00e3o e, portanto, estimulam a condensa\u00e7\u00e3o gota a gota.\u00a0Mas os revestimentos perdem gradualmente sua efic\u00e1cia devido \u00e0 remo\u00e7\u00e3o, oxida\u00e7\u00e3o, etc. Na pr\u00e1tica, n\u00e3o \u00e9 encontrada nenhuma superf\u00edcie que continue sem molhar por um per\u00edodo de tempo.\u00a0Como na maioria das aplica\u00e7\u00f5es de engenharia, muitas vezes \u00e9 dif\u00edcil manter essa condi\u00e7\u00e3o, o uso do valor dos coeficientes de transfer\u00eancia de calor assumindo que a condensa\u00e7\u00e3o gota a gota para fins de projeto n\u00e3o \u00e9 aconselh\u00e1vel.<\/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":"

Condensa\u00e7\u00e3o gota a gota.\u00a0Na condensa\u00e7\u00e3o gota a gota, o vapor condensado forma got\u00edculas na superf\u00edcie em vez de um filme cont\u00ednuo.\u00a0Engenharia T\u00e9rmica Condensa\u00e7\u00e3o gota a gota Diagrama de fases da \u00e1gua. Fonte: wikipedia.org CC BY-SA Da mesma forma que no cap\u00edtulo anterior, neste cap\u00edtulo, discutiremos a transfer\u00eancia de calor com a mudan\u00e7a de fase, mas, … 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 condensa\u00e7\u00e3o Dropwise - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Condensa\u00e7\u00e3o gota a gota. Na condensa\u00e7\u00e3o gota a gota, o vapor condensado forma got\u00edculas na superf\u00edcie em vez de um filme cont\u00ednuo. 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