{"id":47192,"date":"2019-11-03T14:08:45","date_gmt":"2019-11-03T13:08:45","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-incrustacao-fator-de-incrustacao-definicao\/"},"modified":"2020-01-22T16:45:16","modified_gmt":"2020-01-22T15:45:16","slug":"o-que-e-incrustacao-fator-de-incrustacao-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-incrustacao-fator-de-incrustacao-definicao\/","title":{"rendered":"O que \u00e9 incrusta\u00e7\u00e3o – fator de incrusta\u00e7\u00e3o – defini\u00e7\u00e3o"},"content":{"rendered":"
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Sujeira \u00e9 o ac\u00famulo de material indesejado em superf\u00edcies s\u00f3lidas em detrimento da fun\u00e7\u00e3o.\u00a0A incrusta\u00e7\u00e3o em trocadores de calor reduz a efici\u00eancia t\u00e9rmica.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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Incrustantes – fator de incrusta\u00e7\u00e3o<\/h2>\n

O monitoramento on-line dos\u00a0trocadores<\/strong>\u00a0de\u00a0calor<\/strong>\u00a0comerciais\u00a0\u00e9 feito rastreando o\u00a0coeficiente geral de transfer\u00eancia de calor<\/strong>\u00a0, porque o coeficiente geral de transfer\u00eancia de calor tende a diminuir ao longo do tempo devido \u00e0\u00a0incrusta\u00e7\u00e3o<\/strong>\u00a0.\u00a0Sujeira<\/strong>\u00a0\u00e9 o ac\u00famulo de material indesejado em superf\u00edcies s\u00f3lidas em detrimento da fun\u00e7\u00e3o.\u00a0Os materiais incrustantes podem consistir em organismos vivos ou em uma subst\u00e2ncia n\u00e3o viva (minerais ou compostos org\u00e2nicos).\u00a0A camada de dep\u00f3sitos representa\u00a0resist\u00eancia adicional \u00e0 transfer\u00eancia de calor<\/strong>\u00a0e faz com que a taxa de transfer\u00eancia de calor em um trocador de calor diminua.\u00a0Como resultado,\u00a0incrusta\u00e7\u00f5es<\/strong>nos trocadores de calor, reduz a efici\u00eancia t\u00e9rmica, diminui o fluxo de calor, aumenta a temperatura no lado quente, diminui a temperatura no lado frio, induz corros\u00e3o sob dep\u00f3sito, aumenta o uso de \u00e1gua de resfriamento.\u00a0O efeito l\u00edquido dessas acumula\u00e7\u00f5es na transfer\u00eancia de calor \u00e9 representado por um\u00a0fator de incrusta\u00e7\u00e3o<\/strong>\u00a0, Rf, que \u00e9 uma medida da resist\u00eancia t\u00e9rmica geral introduzida pela incrusta\u00e7\u00e3o.<\/p>\n<\/div>\n<\/div>\n

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Coeficiente geral de transfer\u00eancia de calor<\/h2>\n

\"Fator<\/a>Um\u00a0trocador de calor<\/strong>\u00a0normalmente envolve dois fluidos separados por uma parede s\u00f3lida.\u00a0Muitos dos processos de transfer\u00eancia de calor encontrados na ind\u00fastria envolvem sistemas compostos e at\u00e9 envolvem uma combina\u00e7\u00e3o de\u00a0condu\u00e7\u00e3o<\/a>\u00a0e\u00a0convec\u00e7\u00e3o<\/a>\u00a0.\u00a0O calor \u00e9 primeiro transferido do fluido quente para a parede por convec\u00e7\u00e3o, atrav\u00e9s da parede por condu\u00e7\u00e3o e da parede para o fluido frio novamente por convec\u00e7\u00e3o.<\/p>\n

Com estes sistemas compostos, muitas vezes \u00e9 conveniente trabalhar com um\u00a0coeficiente de transfer\u00eancia total de calor<\/a>\u00a0,<\/strong>\u00a0conhecido como um\u00a0factor-L<\/strong>\u00a0.\u00a0O fator U \u00e9 definido por uma express\u00e3o an\u00e1loga \u00e0\u00a0lei do resfriamento de Newton<\/strong>\u00a0:<\/p>\n

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

O\u00a0coeficiente geral de transfer\u00eancia de calor, U,<\/strong>\u00a0est\u00e1 relacionado \u00e0\u00a0resist\u00eancia t\u00e9rmica total<\/a>\u00a0e depende da geometria do problema.\u00a0Por exemplo,\u00a0a transfer\u00eancia de calor<\/a>\u00a0em um\u00a0gerador de vapor<\/a>\u00a0envolve a convec\u00e7\u00e3o do volume do l\u00edquido de arrefecimento do reator para a superf\u00edcie do tubo interno do gerador de vapor, condu\u00e7\u00e3o atrav\u00e9s da parede do tubo e convec\u00e7\u00e3o (ebuli\u00e7\u00e3o) da superf\u00edcie do tubo externo para o fluido lateral secund\u00e1rio.<\/p>\n

Nos casos de transfer\u00eancia combinada de calor para um trocador de calor, existem dois valores para h.\u00a0Existe o coeficiente de transfer\u00eancia de calor por convec\u00e7\u00e3o (h) para o filme fluido dentro dos tubos e um coeficiente de transfer\u00eancia de calor por convec\u00e7\u00e3o para o filme fluido fora dos tubos.\u00a0A\u00a0condutividade t\u00e9rmica<\/a>\u00a0(k) e a espessura (\u0394x) da parede do tubo tamb\u00e9m devem ser levadas em considera\u00e7\u00e3o.<\/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":"

Sujeira \u00e9 o ac\u00famulo de material indesejado em superf\u00edcies s\u00f3lidas em detrimento da fun\u00e7\u00e3o.\u00a0A incrusta\u00e7\u00e3o em trocadores de calor reduz a efici\u00eancia t\u00e9rmica.\u00a0Engenharia T\u00e9rmica Incrustantes – fator de incrusta\u00e7\u00e3o O monitoramento on-line dos\u00a0trocadores\u00a0de\u00a0calor\u00a0comerciais\u00a0\u00e9 feito rastreando o\u00a0coeficiente geral de transfer\u00eancia de calor\u00a0, porque o coeficiente geral de transfer\u00eancia de calor tende a diminuir ao longo do … 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 incrusta\u00e7\u00e3o - fator de incrusta\u00e7\u00e3o - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Sujeira \u00e9 o ac\u00famulo de material indesejado em superf\u00edcies s\u00f3lidas em detrimento da fun\u00e7\u00e3o. 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