{"id":47396,"date":"2019-11-04T07:00:48","date_gmt":"2019-11-04T06:00:48","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/qual-e-o-numero-de-nusselt-para-reatores-de-metais-liquidos-definicao\/"},"modified":"2020-01-23T13:10:41","modified_gmt":"2020-01-23T12:10:41","slug":"qual-e-o-numero-de-nusselt-para-reatores-de-metais-liquidos-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/qual-e-o-numero-de-nusselt-para-reatores-de-metais-liquidos-definicao\/","title":{"rendered":"Qual \u00e9 o n\u00famero de Nusselt para reatores de metais l\u00edquidos – Defini\u00e7\u00e3o"},"content":{"rendered":"
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N\u00famero de Nusselt para reatores de metais l\u00edquidos.\u00a0Para reatores de metal l\u00edquido, as correla\u00e7\u00f5es convectivas de transfer\u00eancia de calor s\u00e3o geralmente apresentadas em termos de n\u00famero de Nusselt versus n\u00famero de P\u00e9clet.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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N\u00famero Nusselt para reatores de metais l\u00edquidos<\/h2>\n

Um\u00a0reator refrigerado a metal l\u00edquido<\/strong>\u00a0\u00e9 um tipo avan\u00e7ado de\u00a0reator nuclear,<\/a>\u00a0onde o refrigerante prim\u00e1rio \u00e9 um metal l\u00edquido. \u00a0Os metais l\u00edquidos<\/strong>\u00a0podem ser usados \u200b\u200bcomo refrigerante, porque possuem excelentes propriedades de transfer\u00eancia de calor e podem ser empregados em sistemas de baixa press\u00e3o, como \u00e9 o caso dos\u00a0reatores r\u00e1pidos resfriados a s\u00f3dio<\/strong>\u00a0(SFRs).\u00a0A caracter\u00edstica \u00fanica dos metais no que diz respeito \u00e0 sua estrutura \u00e9 a presen\u00e7a de portadores de carga,\u00a0el\u00e9trons<\/strong>\u00a0especificamente\u00a0livres,<\/strong>\u00a0proporcionando\u00a0alta condutividade el\u00e9trica<\/strong>\u00a0e\u00a0alta condutividade t\u00e9rmica<\/strong>\u00a0.\u00a0Essa condutividade t\u00e9rmica muito alta, juntamente com causas de baixa viscosidade, correla\u00e7\u00f5es t\u00edpicas de transfer\u00eancia de calor (por exemplo,\u00a0Dittus-Boelter<\/a>) n\u00e3o pode ser usado.<\/p>\n<\/div>\n<\/div>\n

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Para\u00a0metais l\u00edquidos,<\/strong>\u00a0o\u00a0n\u00famero de Prandtl<\/strong><\/a>\u00e9 muito pequeno, geralmente na faixa de\u00a00,01 a 0,001.\u00a0<\/strong>Isso significa que a\u00a0difusividade t\u00e9rmica<\/strong><\/a>\u00a0, que est\u00e1 relacionada \u00e0 taxa de\u00a0transfer\u00eancia<\/strong><\/a>\u00a0de\u00a0calor por condu\u00e7\u00e3o<\/strong><\/a>\u00a0,\u00a0domina<\/strong>\u00a0sem ambiguidade\u00a0.\u00a0Essa difusividade t\u00e9rmica muito alta resulta da condutividade t\u00e9rmica muito alta dos metais, que \u00e9 cerca de 100 vezes maior que a da \u00e1gua.\u00a0O\u00a0n\u00famero de Prandtl<\/strong>\u00a0para s\u00f3dio a uma temperatura de opera\u00e7\u00e3o t\u00edpica nos reatores r\u00e1pidos resfriados a s\u00f3dio \u00e9 de cerca de 0,004.\u00a0Nesse caso, o desenvolvimento da camada limite t\u00e9rmica \u00e9 muito mais r\u00e1pido que o da camada limite de velocidade (\u03b4\u00a0t<\/sub>\u00a0>> \u03b4), e \u00e9 razo\u00e1vel assumir velocidade uniforme ao longo da camada limite t\u00e9rmica.Os coeficientes de transfer\u00eancia de calor para o fluxo de s\u00f3dio atrav\u00e9s do canal de combust\u00edvel s\u00e3o baseados no\u00a0n\u00famero de Prandtl<\/strong>\u00a0e no\u00a0n\u00famero de P\u00e9clet<\/a>\u00a0.\u00a0<\/strong>A inclina\u00e7\u00e3o do di\u00e2metro (P \/ D) tamb\u00e9m faz muitos c\u00e1lculos de transfer\u00eancia de calor em reatores de metal l\u00edquido.\u00a0As correla\u00e7\u00f5es convectivas de transfer\u00eancia de calor<\/strong>\u00a0s\u00e3o geralmente apresentadas em termos de\u00a0n\u00famero<\/strong>\u00a0de\u00a0Nusselt versus n\u00famero de P\u00e9clet<\/strong>\u00a0.\u00a0O n\u00famero t\u00edpico de p\u00e9clet para opera\u00e7\u00e3o normal \u00e9 de 150 a 300 nos pacotes de combust\u00edvel.\u00a0Quanto a outros regimes de fluxo, o n\u00famero de Nusselt e uma determinada correla\u00e7\u00e3o podem ser usados \u200b\u200bpara determinar o coeficiente de transfer\u00eancia de calor por convec\u00e7\u00e3o.<\/p>\n<\/div>\n<\/div>\n

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Correla\u00e7\u00e3o Graber-Rieger<\/span><\/h2>\n

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

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Correla\u00e7\u00e3o FFTF<\/span><\/h2>\n

\"N\u00famero<\/a><\/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","protected":false},"excerpt":{"rendered":"

N\u00famero de Nusselt para reatores de metais l\u00edquidos.\u00a0Para reatores de metal l\u00edquido, as correla\u00e7\u00f5es convectivas de transfer\u00eancia de calor s\u00e3o geralmente apresentadas em termos de n\u00famero de Nusselt versus n\u00famero de P\u00e9clet.\u00a0Engenharia T\u00e9rmica N\u00famero Nusselt para reatores de metais l\u00edquidos Um\u00a0reator refrigerado a metal l\u00edquido\u00a0\u00e9 um tipo avan\u00e7ado de\u00a0reator nuclear,\u00a0onde o refrigerante prim\u00e1rio \u00e9 um … 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":"\nQual \u00e9 o n\u00famero de Nusselt para reatores de metais l\u00edquidos - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"N\u00famero de Nusselt para reatores de metais l\u00edquidos. 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