{"id":48235,"date":"2019-11-08T18:32:18","date_gmt":"2019-11-08T17:32:18","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-processo-irreversivel-definicao\/"},"modified":"2020-01-28T09:02:36","modified_gmt":"2020-01-28T08:02:36","slug":"o-que-e-processo-irreversivel-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-irreversivel-definicao\/","title":{"rendered":"O que \u00e9 processo irrevers\u00edvel &#8211; defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Na termodin\u00e2mica, um processo irrevers\u00edvel \u00e9 definido como um processo que n\u00e3o pode ser revertido,.\u00a0Durante o processo irrevers\u00edvel, a entropia do sistema aumenta.\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-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-spacer\"><\/div>\n<h2>Processo irrevers\u00edvel<\/h2>\n<p>Na termodin\u00e2mica, um\u00a0<strong>processo irrevers\u00edvel<\/strong>\u00a0\u00e9 definido como um processo que n\u00e3o pode ser revertido, processo que n\u00e3o pode retornar o sistema e o ambiente a suas condi\u00e7\u00f5es originais.<\/p>\n<p>Durante o\u00a0<strong>processo irrevers\u00edvel,<\/strong>\u00a0a\u00a0<a title=\"O que \u00e9 entropia\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-entropy\/\"><strong>entropia<\/strong><\/a>\u00a0do sistema\u00a0<strong>aumenta<\/strong>\u00a0.\u00a0Existem muitos fatores que tornam um processo irrevers\u00edvel:<\/p>\n<ul>\n<li><strong>Presen\u00e7a de atrito e perdas de calor.\u00a0<\/strong>Em sistemas termodin\u00e2micos reais ou em processos t\u00e9rmicos reais, n\u00e3o podemos excluir a presen\u00e7a de atrito mec\u00e2nico ou perdas de calor.<\/li>\n<li><strong>Diferen\u00e7a de temperatura finita.\u00a0<\/strong>Os processos n\u00e3o s\u00e3o feitos infinitamente devagar.\u00a0Por exemplo, pode haver turbul\u00eancia no g\u00e1s. Portanto, os motores t\u00e9rmicos devem ter efici\u00eancias mais baixas do que os limites de efici\u00eancia devido \u00e0 irreversibilidade inerente ao\u00a0ciclo do\u00a0<a title=\"Motores t\u00e9rmicos\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-heat-engine-definicao\/\">motor t\u00e9rmico<\/a>\u00a0que eles usam.<\/li>\n<li><strong>Mistura de duas subst\u00e2ncias diferentes<\/strong><\/li>\n<\/ul>\n<p>Esses fatores est\u00e3o presentes em processos reais e irrevers\u00edveis e evitam que esses processos sejam revers\u00edveis.<\/p>\n<h2>Irreversibilidade dos processos naturais<\/h2>\n<p><strong>De acordo com a\u00a0<a title=\"Segunda Lei da Termodin\u00e2mica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-segunda-lei-da-termodinamica-definicao\/\">segunda lei da termodin\u00e2mica<\/a>\u00a0:<\/strong><\/p>\n<p><em>A entropia de qualquer sistema isolado nunca diminui.\u00a0Em um processo termodin\u00e2mico natural, a soma das entropias dos sistemas termodin\u00e2micos em intera\u00e7\u00e3o aumenta. \u00a0<\/em><\/p>\n<p>Esta lei indica a\u00a0<strong>irreversibilidade<\/strong>\u00a0dos\u00a0<strong>processos naturais<\/strong> . Processos revers\u00edveis s\u00e3o uma fic\u00e7\u00e3o te\u00f3rica \u00fatil e conveniente, mas n\u00e3o ocorrem na natureza. A partir desta lei, \u00e9 imposs\u00edvel construir um dispositivo que opere em um ciclo e cujo \u00fanico efeito seja a transfer\u00eancia de calor de um corpo mais frio para um corpo mais quente. Segue-se que m\u00e1quinas perp\u00e9tuas de movimento do segundo tipo s\u00e3o imposs\u00edveis.<\/p>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<h2><span>Processo isentr\u00f3pico vs. adiab\u00e1tico<\/span><\/h2>\n<figure id=\"attachment_17267\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-17267\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion.png\"><img loading=\"lazy\" class=\"size-medium wp-image-17267 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion-276x300.png\" alt=\"Expans\u00e3o isentr\u00f3pica vs. adiab\u00e1tica\" width=\"276\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion-276x300.png\" \/><\/a><figcaption id=\"caption-attachment-17267\" class=\"wp-caption-text\"><span>O processo isentr\u00f3pico \u00e9 um caso especial de processos adiab\u00e1ticos.\u00a0\u00c9 um processo adiab\u00e1tico revers\u00edvel.\u00a0Um processo isentr\u00f3pico tamb\u00e9m pode ser chamado de processo de entropia constante.<\/span><\/figcaption><\/figure>\n<p><span>Um\u00a0<\/span><strong><span>processo isentr\u00f3pico<\/span><\/strong><span>\u00a0\u00e9 um processo termodin\u00e2mico, no qual a\u00a0<\/span><strong><span>entropia<\/span><\/strong><span>\u00a0do fluido ou g\u00e1s\u00a0<\/span><strong><span>permanece constante<\/span><\/strong><span>\u00a0.\u00a0Isso significa que o processo isentr\u00f3pico \u00e9 um caso especial de um\u00a0<\/span><strong><span>processo adiab\u00e1tico<\/span><\/strong><span>\u00a0no qual n\u00e3o h\u00e1 transfer\u00eancia de calor ou mat\u00e9ria.\u00a0\u00c9 um\u00a0<\/span><strong><span>processo adiab\u00e1tico revers\u00edvel<\/span><\/strong><span>\u00a0.\u00a0Um processo isentr\u00f3pico tamb\u00e9m pode ser chamado de processo de entropia constante.\u00a0Na engenharia, esse processo idealizado \u00e9 muito \u00fatil para compara\u00e7\u00e3o com processos reais.<\/span><\/p>\n<p><span>Uma maneira de fazer com que processos reais se aproximem de\u00a0<\/span><a title=\"Processo revers\u00edvel\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-reversivel-definicao\/\"><strong><span>processos revers\u00edveis<\/span><\/strong><\/a><span>\u00a0\u00e9 execut\u00e1-lo em uma s\u00e9rie de\u00a0<strong>etapas\u00a0<\/strong><\/span><strong><span>pequenas<\/span><\/strong><span>\u00a0ou\u00a0<\/span><strong><span>infinitesimais<\/span><\/strong><span>\u00a0ou\u00a0<\/span><strong><span>infinitamente lenta<\/span><\/strong><span>\u00a0, para que o processo possa ser considerado como uma s\u00e9rie de estados de equil\u00edbrio.\u00a0Por exemplo, a transfer\u00eancia de calor pode ser considerada revers\u00edvel se ocorrer devido a uma\u00a0<\/span><strong><span>pequena diferen\u00e7a de temperatura<\/span><\/strong><span>entre o sistema e seus arredores.\u00a0Mas processos reais n\u00e3o s\u00e3o feitos infinitamente devagar.\u00a0Processos revers\u00edveis s\u00e3o uma fic\u00e7\u00e3o te\u00f3rica \u00fatil e conveniente, mas n\u00e3o ocorrem na natureza.\u00a0Por exemplo, pode haver turbul\u00eancia no g\u00e1s.\u00a0Portanto, os motores t\u00e9rmicos devem ter efici\u00eancias mais baixas do que os limites de efici\u00eancia devido \u00e0 irreversibilidade inerente ao ciclo dos motores t\u00e9rmicos que utilizam.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>&#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;.<\/p>\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","protected":false},"excerpt":{"rendered":"<p>Na termodin\u00e2mica, um processo irrevers\u00edvel \u00e9 definido como um processo que n\u00e3o pode ser revertido,.\u00a0Durante o processo irrevers\u00edvel, a entropia do sistema aumenta.\u00a0Engenharia T\u00e9rmica Processo irrevers\u00edvel Na termodin\u00e2mica, um\u00a0processo irrevers\u00edvel\u00a0\u00e9 definido como um processo que n\u00e3o pode ser revertido, processo que n\u00e3o pode retornar o sistema e o ambiente a suas condi\u00e7\u00f5es originais. Durante o\u00a0processo &#8230; <a title=\"O que \u00e9 processo irrevers\u00edvel &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-irreversivel-definicao\/\" aria-label=\"More on O que \u00e9 processo irrevers\u00edvel &#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 processo irrevers\u00edvel - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Em termodin\u00e2mica, um processo irrevers\u00edvel \u00e9 definido como um processo que n\u00e3o pode ser revertido,. Durante o processo irrevers\u00edvel, a entropia do sistema aumenta. 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