{"id":48171,"date":"2019-11-08T09:34:59","date_gmt":"2019-11-08T08:34:59","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-expansao-livre-expansao-joule-definicao\/"},"modified":"2020-01-27T17:20:10","modified_gmt":"2020-01-27T16:20:10","slug":"o-que-e-expansao-livre-expansao-joule-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-expansao-livre-expansao-joule-definicao\/","title":{"rendered":"O que \u00e9 Expans\u00e3o Livre – Expans\u00e3o Joule – Defini\u00e7\u00e3o"},"content":{"rendered":"
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A expans\u00e3o livre ou a expans\u00e3o de Joule \u00e9 um processo adiab\u00e1tico no qual nenhuma transfer\u00eancia de calor ocorre entre o sistema e seu ambiente e nenhum trabalho \u00e9 realizado.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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Processo Adiab\u00e1tico<\/h2>\n

Um\u00a0processo adiab\u00e1tico<\/strong>\u00a0\u00e9 um\u00a0processo termodin\u00e2mico<\/a>\u00a0, no qual n\u00e3o\u00a0h\u00e1 transfer\u00eancia de calor para<\/strong>\u00a0dentro ou para fora do sistema (Q = 0).\u00a0O sistema pode ser considerado\u00a0perfeitamente isolado<\/strong>\u00a0.\u00a0Em um processo adiab\u00e1tico, a energia \u00e9 transferida apenas como trabalho.\u00a0A suposi\u00e7\u00e3o de que n\u00e3o h\u00e1 transfer\u00eancia de calor \u00e9 muito importante, pois podemos usar a aproxima\u00e7\u00e3o adiab\u00e1tica apenas em\u00a0processos muito r\u00e1pidos<\/strong>\u00a0.\u00a0Nesses processos r\u00e1pidos, n\u00e3o h\u00e1 tempo suficiente para que a transfer\u00eancia de energia como calor ocorra de ou para o sistema.<\/p>\n

Em dispositivos reais (como turbinas, bombas e compressores)\u00a0ocorrem\u00a0perdas<\/strong>\u00a0e\u00a0perdas de calor<\/strong>\u00a0no processo de combust\u00e3o, mas essas perdas s\u00e3o geralmente baixas em compara\u00e7\u00e3o com o fluxo geral de energia e podemos aproximar alguns processos termodin\u00e2micos pelo processo adiab\u00e1tico.<\/p>\n<\/div>\n<\/div>\n

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Expans\u00e3o Livre – Expans\u00e3o Joule<\/h2>\n

Esses s\u00e3o\u00a0processos adiab\u00e1ticos<\/strong>\u00a0nos quais\u00a0nenhuma transfer\u00eancia de calor<\/strong>\u00a0ocorre entre o sistema e seu ambiente e\u00a0nenhum trabalho \u00e9 realizado<\/strong>\u00a0no sistema.\u00a0Esses tipos de processos adiab\u00e1ticos s\u00e3o chamados de\u00a0expans\u00e3o livre<\/strong>\u00a0.\u00a0\u00c9 um\u00a0processo irrevers\u00edvel<\/strong>\u00a0no qual um g\u00e1s se expande para uma c\u00e2mara evacuada isolada.\u00a0\u00c9 tamb\u00e9m chamado de\u00a0expans\u00e3o Joule<\/strong>\u00a0.\u00a0Para um g\u00e1s ideal, a temperatura n\u00e3o muda (veja:\u00a0Segunda Lei de Joule<\/a>\u00a0), no entanto, gases reais sofrem uma mudan\u00e7a de temperatura durante a expans\u00e3o livre.\u00a0Na expans\u00e3o livre Q = W = 0, e a primeira lei exige que:<\/p>\n

dE\u00a0<\/strong>int<\/sub><\/strong>\u00a0= 0<\/strong><\/p>\n

Uma expans\u00e3o livre n\u00e3o pode ser plotada em um diagrama fotovoltaico, porque o processo \u00e9 r\u00e1pido, n\u00e3o quase est\u00e1tico.\u00a0Os estados intermedi\u00e1rios n\u00e3o s\u00e3o estados de equil\u00edbrio e, portanto, a press\u00e3o n\u00e3o est\u00e1 claramente definida.<\/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":"

A expans\u00e3o livre ou a expans\u00e3o de Joule \u00e9 um processo adiab\u00e1tico no qual nenhuma transfer\u00eancia de calor ocorre entre o sistema e seu ambiente e nenhum trabalho \u00e9 realizado.\u00a0Engenharia T\u00e9rmica Processo Adiab\u00e1tico Um\u00a0processo adiab\u00e1tico\u00a0\u00e9 um\u00a0processo termodin\u00e2mico\u00a0, no qual n\u00e3o\u00a0h\u00e1 transfer\u00eancia de calor para\u00a0dentro ou para fora do sistema (Q = 0).\u00a0O sistema pode ser … 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 Expans\u00e3o Livre - Expans\u00e3o Joule - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"A expans\u00e3o livre ou a expans\u00e3o de Joule \u00e9 um processo adiab\u00e1tico no qual nenhuma transfer\u00eancia de calor ocorre entre o sistema e seu ambiente e nenhum trabalho \u00e9 realizado. 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