{"id":47244,"date":"2019-11-03T18:20:16","date_gmt":"2019-11-03T17:20:16","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-o-modo-de-condensacao-tipos-de-condensacao-definicao\/"},"modified":"2020-01-22T17:05:39","modified_gmt":"2020-01-22T16:05:39","slug":"o-que-e-o-modo-de-condensacao-tipos-de-condensacao-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-modo-de-condensacao-tipos-de-condensacao-definicao\/","title":{"rendered":"O que \u00e9 o Modo de Condensa\u00e7\u00e3o &#8211; Tipos de Condensa\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Modos de condensa\u00e7\u00e3o &#8211; Tipos de condensa\u00e7\u00e3o.\u00a0Do ponto de vista pr\u00e1tico da engenharia, a condensa\u00e7\u00e3o pode ser categorizada de acordo com v\u00e1rios crit\u00e9rios.\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-60 lgc-tablet-grid-60 lgc-mobile-grid-100 lgc-equal-heights lgc-first\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2>Modos de Condensa\u00e7\u00e3o &#8211; Tipos de Condensa\u00e7\u00e3o<\/h2>\n<p>Do ponto de vista pr\u00e1tico da engenharia, a\u00a0<strong>condensa\u00e7\u00e3o<\/strong>\u00a0pode ser categorizada de acordo com\u00a0<strong>v\u00e1rios crit\u00e9rios<\/strong>\u00a0.<\/p>\n<p>Em geral, s\u00e3o observadas tr\u00eas formas distintas de condensa\u00e7\u00e3o:<\/p>\n<ul>\n<li><strong>Condensa\u00e7\u00e3o de filme<\/strong>\u00a0.\u00a0Na\u00a0<strong>condensa\u00e7\u00e3o do filme<\/strong>\u00a0, o condensado molha a superf\u00edcie e forma um filme l\u00edquido na superf\u00edcie que desliza sob a influ\u00eancia da gravidade.\u00a0A condensa\u00e7\u00e3o do filme resulta em baixas taxas de transfer\u00eancia de calor, pois o filme de condensado impede a transfer\u00eancia de calor.\u00a0A espessura do filme formado depende de muitos par\u00e2metros, incluindo orienta\u00e7\u00e3o da superf\u00edcie, viscosidade, taxa de condensa\u00e7\u00e3o etc. O filme aumenta\u00a0<a title=\"Resist\u00eancia t\u00e9rmica - analogia \u00e0 resist\u00eancia el\u00e9trica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/heat-transfer\/thermal-conduction\/thermal-resistance-thermal-resistivity\/thermal-resistance-analogy-to-electric-resistance\/\">a resist\u00eancia t\u00e9rmica<\/a>\u00a0ao fluxo de calor entre a superf\u00edcie e o vapor.\u00a0A taxa de transfer\u00eancia de calor \u00e9 reduzida devido a essa resist\u00eancia.<\/li>\n<li><strong>Condensa\u00e7\u00e3o gota a gota<\/strong>\u00a0.\u00a0Na condensa\u00e7\u00e3o gota a gota, 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<strong>molhando<\/strong>\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<a title=\"Condensador Principal - Condensador a Vapor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power-plant\/turbine-generator-power-conversion-system\/main-condenser-steam-condenser\/\"><strong>condensadores 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.<\/li>\n<li><strong>Condensa\u00e7\u00e3o por contato direto.\u00a0<\/strong>A condensa\u00e7\u00e3o de contato direto, DCC, ocorre quando o vapor entra em contato com um l\u00edquido frio.\u00a0Como nos condensadores de jato, a \u00e1gua de resfriamento \u00e9 pulverizada no vapor de exaust\u00e3o e h\u00e1\u00a0<strong>contato direto<\/strong>\u00a0entre o vapor de exaust\u00e3o e a \u00e1gua de resfriamento.\u00a0O processo de condensa\u00e7\u00e3o \u00e9\u00a0<strong>muito r\u00e1pido<\/strong>\u00a0e eficiente, mas aqui a \u00e1gua de resfriamento e o vapor condensado s\u00e3o\u00a0<strong>misturados<\/strong>.\u00a0As vantagens da condensa\u00e7\u00e3o de contato direto sobre os processos convencionais usando superf\u00edcies de transfer\u00eancia met\u00e1licas s\u00e3o devidas \u00e0 relativa simplicidade do projeto, menos problemas de corros\u00e3o e descama\u00e7\u00e3o, custos de manuten\u00e7\u00e3o mais baixos, \u00e1reas de transfer\u00eancia espec\u00edficas mais altas e taxas de transfer\u00eancia mais altas.\u00a0Apesar dessas vantagens, os condensadores de jato n\u00e3o s\u00e3o comuns em usinas termel\u00e9tricas, principalmente devido \u00e0\u00a0<strong>perda de condensado<\/strong>\u00a0.<\/li>\n<\/ul>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-40 lgc-tablet-grid-40 lgc-mobile-grid-100 lgc-equal-heights lgc-last\">\n<div class=\"inside-grid-column\">\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/film-condensation-condensation-min.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-20933 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/film-condensation-condensation-min-185x300.png\" alt=\"condensa\u00e7\u00e3o de filme\" width=\"185\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/film-condensation-condensation-min-185x300.png\" \/><\/a>___________<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/dropwise-condensation-condensation-min.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-20932 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/dropwise-condensation-condensation-min-162x300.png\" alt=\"condensa\u00e7\u00e3o gota a gota\" width=\"162\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/dropwise-condensation-condensation-min-162x300.png\" \/><\/a><\/p>\n<p>___________<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/direct-contact-condensation-condensation-min.png\"><img loading=\"lazy\" class=\"aligncenter size-medium wp-image-20934\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/direct-contact-condensation-condensation-min-150x300.png\" alt=\"condensa\u00e7\u00e3o de contato direto\" width=\"150\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/direct-contact-condensation-condensation-min-150x300.png\" \/><\/a><\/p>\n<\/div>\n<\/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-divider su-divider-style-dotted\">&#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;.<\/div>\n<\/div>\n<\/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=\"su-spoiler-title\" tabindex=\"0\" role=\"button\">\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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Modos de condensa\u00e7\u00e3o &#8211; Tipos de condensa\u00e7\u00e3o.\u00a0Do ponto de vista pr\u00e1tico da engenharia, a condensa\u00e7\u00e3o pode ser categorizada de acordo com v\u00e1rios crit\u00e9rios.\u00a0Engenharia T\u00e9rmica Modos de Condensa\u00e7\u00e3o &#8211; Tipos de Condensa\u00e7\u00e3o Do ponto de vista pr\u00e1tico da engenharia, a\u00a0condensa\u00e7\u00e3o\u00a0pode ser categorizada de acordo com\u00a0v\u00e1rios crit\u00e9rios\u00a0. Em geral, s\u00e3o observadas tr\u00eas formas distintas de condensa\u00e7\u00e3o: Condensa\u00e7\u00e3o &#8230; <a title=\"O que \u00e9 o Modo de Condensa\u00e7\u00e3o &#8211; Tipos de Condensa\u00e7\u00e3o &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-modo-de-condensacao-tipos-de-condensacao-definicao\/\" aria-label=\"More on O que \u00e9 o Modo de Condensa\u00e7\u00e3o &#8211; Tipos de Condensa\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 o Modo de Condensa\u00e7\u00e3o - Tipos de Condensa\u00e7\u00e3o - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Modos de condensa\u00e7\u00e3o - Tipos de condensa\u00e7\u00e3o. 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