{"id":47675,"date":"2019-11-05T22:27:46","date_gmt":"2019-11-05T21:27:46","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-a-lei-de-wiedemann-franz-numero-lorenz-definicao\/"},"modified":"2020-01-24T13:05:41","modified_gmt":"2020-01-24T12:05:41","slug":"o-que-e-a-lei-de-wiedemann-franz-numero-lorenz-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-lei-de-wiedemann-franz-numero-lorenz-definicao\/","title":{"rendered":"O que \u00e9 a lei de Wiedemann \u2013 Franz – n\u00famero Lorenz – defini\u00e7\u00e3o"},"content":{"rendered":"
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Wiedemann \u2013 Franz Law – N\u00famero Lorenz.\u00a0Aumentar a temperatura aumenta a condutividade t\u00e9rmica e diminui a condutividade el\u00e9trica.\u00a0Esse comportamento \u00e9 quantificado na lei de Wiedemann-Franz.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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Wiedemann \u2013 Franz Law – N\u00famero Lorenz<\/h2>\n

A uma determinada temperatura, as\u00a0condutividades t\u00e9rmicas e el\u00e9tricas<\/strong>\u00a0dos metais s\u00e3o\u00a0proporcionais<\/strong>\u00a0, mas aumentar a temperatura aumenta a condutividade t\u00e9rmica e diminui a condutividade el\u00e9trica.\u00a0Esse comportamento \u00e9 quantificado na\u00a0lei de Wiedemann-Franz<\/strong>\u00a0.\u00a0Esta lei estabelece que a raz\u00e3o entre a contribui\u00e7\u00e3o eletr\u00f4nica da condutividade t\u00e9rmica (\u00a0k<\/em>\u00a0) e a condutividade el\u00e9trica (\u03c3) de um metal \u00e9 proporcional \u00e0 temperatura (T).<\/p>\n

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

Qualitativamente, essa rela\u00e7\u00e3o \u00e9 baseada no fato de que o calor e o transporte el\u00e9trico envolvem os\u00a0el\u00e9trons livres<\/strong>\u00a0no metal.\u00a0A condutividade el\u00e9trica diminui com o aumento da velocidade das part\u00edculas porque as colis\u00f5es desviam os el\u00e9trons do transporte de carga para frente.\u00a0No entanto, a condutividade t\u00e9rmica aumenta com a velocidade m\u00e9dia das part\u00edculas, pois isso aumenta o transporte de energia para frente.\u00a0A lei de Wiedemann-Franz \u00e9 geralmente bem obedecida a altas temperaturas.\u00a0Nas regi\u00f5es de temperatura baixa e intermedi\u00e1ria, no entanto, a lei falha devido \u00e0 dispers\u00e3o inel\u00e1stica dos transportadores de carga.<\/p>\n

Deve-se notar que a correla\u00e7\u00e3o geral entre condutividade el\u00e9trica e t\u00e9rmica n\u00e3o se aplica a outros materiais, devido \u00e0 crescente import\u00e2ncia dos transportadores de f\u00f4non para o calor em n\u00e3o-metais.<\/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","protected":false},"excerpt":{"rendered":"

Wiedemann \u2013 Franz Law – N\u00famero Lorenz.\u00a0Aumentar a temperatura aumenta a condutividade t\u00e9rmica e diminui a condutividade el\u00e9trica.\u00a0Esse comportamento \u00e9 quantificado na lei de Wiedemann-Franz.\u00a0Engenharia T\u00e9rmica Wiedemann \u2013 Franz Law – N\u00famero Lorenz A uma determinada temperatura, as\u00a0condutividades t\u00e9rmicas e el\u00e9tricas\u00a0dos metais s\u00e3o\u00a0proporcionais\u00a0, mas aumentar a temperatura aumenta a condutividade t\u00e9rmica e diminui a condutividade … 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 a lei de Wiedemann \u2013 Franz - n\u00famero Lorenz - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Wiedemann \u2013 Franz Law - N\u00famero Lorenz. 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