{"id":51531,"date":"2020-01-28T08:35:15","date_gmt":"2020-01-28T07:35:15","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-processo-termodinamico-definicao\/"},"modified":"2020-01-28T09:01:49","modified_gmt":"2020-01-28T08:01:49","slug":"o-que-e-processo-termodinamico-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-termodinamico-definicao\/","title":{"rendered":"O que \u00e9 processo termodin\u00e2mico &#8211; defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Um processo termodin\u00e2mico \u00e9 definido como uma mudan\u00e7a de um macroestado de equil\u00edbrio para outro macroestado. O conhecimento dos processos termodin\u00e2micos \u00e9 da maior import\u00e2ncia para os engenheiros. Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div><\/div>\n<div><\/div>\n<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<h2><span>Processos termodin\u00e2micos<\/span><\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermodynamic-processes.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-17258 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermodynamic-processes-300x246.png\" alt=\"Processos termodin\u00e2micos\" width=\"300\" height=\"246\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Thermodynamic-processes-300x246.png\" \/><\/a><span>Um\u00a0<\/span><strong><span>processo termodin\u00e2mico<\/span><\/strong><span>\u00a0\u00e9 definido como uma mudan\u00e7a de um macroestado de equil\u00edbrio para outro macroestado.\u00a0Os\u00a0<strong>estados\u00a0<\/strong><\/span><strong><span>inicial<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>final<\/span><\/strong><span>\u00a0s\u00e3o os elementos definidores do processo.\u00a0Durante um tal processo, um sistema come\u00e7a a partir de um\u00a0<\/span><strong><span>estado inicial de i<\/span><\/strong><span>\u00a0, descrito por uma\u00a0<\/span><strong><a title=\"O que \u00e9 press\u00e3o - F\u00edsica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/\"><span>press\u00e3o p\u00a0<\/span><sub><span>i<\/span><\/sub><\/a><\/strong><span>\u00a0, um\u00a0<\/span><strong><a title=\"O que \u00e9 volume - F\u00edsica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-volume-physics\/\"><span>volume V\u00a0<\/span><sub><span>i<\/span><\/sub><\/a><\/strong><span>\u00a0e uma\u00a0<\/span><strong><a title=\"O que \u00e9 temperatura - F\u00edsica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-temperatura-fisica-definicao\/\"><span>temperatura T\u00a0<\/span><sub><span>i<\/span><\/sub><\/a><\/strong><span>\u00a0, passa atrav\u00e9s de v\u00e1rios\u00a0<\/span><strong><span>estados quase-est\u00e1tico<\/span><\/strong><span>\u00a0para um\u00a0<\/span><strong><span>estado final f<\/span><\/strong><span>\u00a0, descrito por uma\u00a0<\/span><strong><span>press\u00e3o p\u00a0<\/span><sub><span>f<\/span><\/sub><\/strong><span>\u00a0, uma\u00a0<\/span><strong><span>volume V\u00a0<\/span><sub><span>f<\/span><\/sub><\/strong><span>\u00a0e\u00a0<\/span><strong><span>temperatura T\u00a0<\/span><sub><span>f<\/span><\/sub><\/strong><span>\u00a0.\u00a0Nesse processo<\/span><a title=\"O que \u00e9 energia - F\u00edsica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/\"><span>a energia<\/span><\/a><span>\u00a0pode ser transferida do formul\u00e1rio ou para o sistema e tamb\u00e9m o\u00a0<\/span><a title=\"Trabalho em Termodin\u00e2mica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-trabalho-em-termodinamica-definicao\/\"><span>trabalho<\/span><\/a><span>\u00a0pode ser feito pelo sistema.\u00a0Um exemplo de um processo termodin\u00e2mico \u00e9 aumentar a press\u00e3o de um g\u00e1s enquanto mant\u00e9m uma temperatura constante.\u00a0Na se\u00e7\u00e3o a seguir, h\u00e1 exemplos de processos termodin\u00e2micos que s\u00e3o da maior import\u00e2ncia na engenharia de\u00a0<\/span><a title=\"Motores t\u00e9rmicos\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-heat-engine-definicao\/\"><span>motores t\u00e9rmicos<\/span><\/a><span> .<\/span><\/p>\n<\/div>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\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<h2><span>Tipos de processos termodin\u00e2micos<\/span><\/h2>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<div class=\"su-spacer\"><\/div>\n<h2><span>Processo revers\u00edvel<\/span><\/h2>\n<p><span>Na termodin\u00e2mica, um\u00a0<\/span><strong><span>processo revers\u00edvel<\/span><\/strong><span>\u00a0\u00e9 definido como um processo que pode ser\u00a0<\/span><strong><span>revertido<\/span><\/strong><span>\u00a0pela indu\u00e7\u00e3o de\u00a0<\/span><strong><span>altera\u00e7\u00f5es infinitesimais<\/span><\/strong><span>\u00a0em alguma propriedade do sistema e, ao faz\u00ea-lo, n\u00e3o deixa mudan\u00e7as no sistema ou nos arredores.\u00a0Durante o processo revers\u00edvel, a\u00a0<\/span><a title=\"O que \u00e9 entropia\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-entropy\/\"><strong><span>entropia<\/span><\/strong><\/a><span>\u00a0do sistema\u00a0<\/span><strong><span>n\u00e3o aumenta<\/span><\/strong><span>\u00a0e o sistema est\u00e1 em\u00a0<\/span><a title=\"Equil\u00edbrio t\u00e9rmico\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-temperature-physics\/thermal-equilibrium\/\"><span>equil\u00edbrio termodin\u00e2mico<\/span><\/a><span>\u00a0com o ambiente.<\/span><\/p>\n<div class=\"su-spacer\"><\/div>\n<div class=\"su-spacer\"><\/div>\n<h2><span>Processo irrevers\u00edvel<\/span><\/h2>\n<p><span>Na termodin\u00e2mica, um\u00a0<\/span><strong><span>processo irrevers\u00edvel<\/span><\/strong><span>\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.<\/span><\/p>\n<p><span>Durante o\u00a0<\/span><strong><span>processo irrevers\u00edvel,<\/span><\/strong><span>\u00a0a\u00a0<\/span><a title=\"O que \u00e9 entropia\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-entropy\/\"><strong><span>entropia<\/span><\/strong><\/a><span>\u00a0do sistema\u00a0<\/span><strong><span>aumenta<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<div class=\"su-spacer\"><\/div>\n<div class=\"su-spacer\"><\/div>\n<h2><span>Processo c\u00edclico<\/span><\/h2>\n<p><span>Um processo que eventualmente retorna um sistema ao seu estado inicial \u00e9 chamado de\u00a0<\/span><strong><span>processo c\u00edclico<\/span><\/strong><span>\u00a0.\u00a0Na conclus\u00e3o de um ciclo, todas as propriedades t\u00eam o mesmo valor que tinham no in\u00edcio.\u00a0Para esse processo, o\u00a0<\/span><strong><span>estado final<\/span><\/strong><span>\u00a0\u00e9 o\u00a0<\/span><strong><span>mesmo que o estado inicial<\/span><\/strong><span>\u00a0e, portanto, a\u00a0mudan\u00e7a\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-energia-interna-energia-termica-definicao\/\"><strong><span>total de energia interna<\/span><\/strong><\/a><span>\u00a0deve ser zero.<\/span><\/p>\n<p><span>Deve-se notar que, de acordo com a\u00a0<\/span><strong><a title=\"Segunda Lei da Termodin\u00e2mica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-segunda-lei-da-termodinamica-definicao\/\"><span>segunda lei da termodin\u00e2mica<\/span><\/a><\/strong><span>\u00a0, nem todo o calor fornecido a um ciclo pode ser transformado em uma quantidade igual de trabalho; alguma\u00a0<\/span><strong><span>rejei\u00e7\u00e3o de calor<\/span><\/strong><span>\u00a0deve ocorrer.\u00a0A\u00a0<\/span><a title=\"Efici\u00eancia t\u00e9rmica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-eficiencia-termica-definicao\/\"><strong><span>efici\u00eancia t\u00e9rmica<\/span><\/strong><\/a><span>\u00a0,\u00a0<\/span><strong><em><span>\u03b7\u00a0<\/span><\/em><\/strong><strong><em><sub><span>th<\/span><\/sub><\/em><\/strong><span>\u00a0, de qualquer motor de calor como a raz\u00e3o entre o\u00a0<\/span><a title=\"Trabalho em Termodin\u00e2mica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-trabalho-em-termodinamica-definicao\/\"><span>trabalho<\/span><\/a><span>\u00a0que faz,\u00a0<\/span><strong><span>W<\/span><\/strong><span>\u00a0, para o\u00a0<\/span><a title=\"Calor na Termodin\u00e2mica\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-calor-na-fisica-calor-definicao\/\"><span>calor<\/span><\/a><span>\u00a0de entrada a uma temperatura elevada, Q\u00a0<\/span><sub><span>H<\/span><\/sub><span>\u00a0.\u00a0\u00a0<\/span><strong><em><span>\u03b7\u00a0<\/span><\/em><em><sub><span>th<\/span><\/sub><\/em><span>\u00a0\u00a0= W \/ Q\u00a0<\/span><sub><span>H<\/span><\/sub><\/strong><span>\u00a0.<\/span><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\">\n<p><span>Vide tamb\u00e9m:\u00a0<\/span><a title=\"Processo revers\u00edvel\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-reversivel-definicao\/\"><span>Processo revers\u00edvel<\/span><\/a><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Processo irrevers\u00edvel\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-irreversivel-definicao\/\"><span>Processo irrevers\u00edvel<\/span><\/a><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Processo c\u00edclico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-ciclico-definicao\/\"><span>Processo c\u00edclico<\/span><\/a><\/p>\n<figure id=\"attachment_17267\" class=\"wp-caption aligncenter\" 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<figure id=\"attachment_16885\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-16885\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Cyclic-process-work.png\"><img loading=\"lazy\" class=\"size-medium wp-image-16885 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Cyclic-process-work-300x243.png\" alt=\"Processo c\u00edclico - trabalho\" width=\"300\" height=\"243\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Cyclic-process-work-300x243.png\" \/><\/a><figcaption id=\"caption-attachment-16885\" class=\"wp-caption-text\"><span>Um processo que eventualmente retorna um sistema ao seu estado inicial \u00e9 chamado de processo c\u00edclico.<\/span><\/figcaption><\/figure>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\n<h2><\/h2>\n<h2><\/h2>\n<h2><\/h2>\n<h2><\/h2>\n<h2><\/h2>\n<h2><\/h2>\n<h2><span>Processo isentr\u00f3pico<\/span><\/h2>\n<p><span>Um\u00a0<\/span><a title=\"Processo isentr\u00f3pico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-isentropico-definicao\/\"><strong><span>processo isentr\u00f3pico<\/span><\/strong><\/a><span>\u00a0\u00e9 um\u00a0<\/span><strong><span>processo termodin\u00e2mico<\/span><\/strong><span>\u00a0, no qual a\u00a0<\/span><a title=\"O que \u00e9 entropia\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-entropy\/\"><strong><span>entropia<\/span><\/strong>\u00a0<\/a><span>do fluido ou g\u00e1s permanece constante.\u00a0Isso significa que o\u00a0<\/span><strong><span>processo isentr\u00f3pico<\/span><\/strong><span>\u00a0\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\u00a0<\/span><strong><span>processo isentr\u00f3pico<\/span><\/strong><span>\u00a0tamb\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>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Processo isentr\u00f3pico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-isentropico-definicao\/\"><span>Processo isentr\u00f3pico<\/span><\/a><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/P-V-diagram-isentropic-process.png\"><img loading=\"lazy\" class=\"size-medium wp-image-17284 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/P-V-diagram-isentropic-process-300x251.png\" alt=\"Diagrama PV - processo isentr\u00f3pico\" width=\"300\" height=\"251\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/P-V-diagram-isentropic-process-300x251.png\" \/><\/a><\/p>\n<p><span>Diagrama PV de uma expans\u00e3o isentr\u00f3pica de h\u00e9lio (3 \u2192 4) em uma turbina a g\u00e1s<\/span><\/p>\n<h2><\/h2>\n<h2><span>Processo Adiab\u00e1tico<\/span><\/h2>\n<p><span>Um\u00a0<\/span><a title=\"Processo Adiab\u00e1tico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-adiabatico-definicao\/\"><strong><span>processo adiab\u00e1tico<\/span><\/strong><\/a><span>\u00a0\u00e9 um\u00a0<\/span><a title=\"Processos termodin\u00e2micos\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-termodinamico-definicao\/\"><span>processo termodin\u00e2mico<\/span><\/a><span>\u00a0, no qual n\u00e3o\u00a0<\/span><strong><span>h\u00e1 transfer\u00eancia de calor para<\/span><\/strong><span>\u00a0dentro ou para fora do sistema (Q = 0).\u00a0O sistema pode ser considerado\u00a0<\/span><strong><span>perfeitamente isolado<\/span><\/strong><span>\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\u00a0<\/span><strong><span>processos muito r\u00e1pidos<\/span><\/strong><span>\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.<\/span><\/p>\n<p><span>Em dispositivos reais (como turbinas, bombas e compressores)\u00a0ocorrem\u00a0<\/span><strong><span>perdas<\/span><\/strong><span>\u00a0e\u00a0<strong>perdas 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.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><span><a title=\"Processo Adiab\u00e1tico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-adiabatico-definicao\/\">Processo adiab\u00e1tic<\/a>o<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion.png\"><img loading=\"lazy\" class=\"size-full wp-image-17267 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion.png\" alt=\"Expans\u00e3o isentr\u00f3pica vs. adiab\u00e1tica\" width=\"393\" height=\"427\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Isentropic-vs.-adiabatic-expansion.png\" \/><\/a><\/p>\n<p><span>Expans\u00e3o isentr\u00f3pica vs. adiab\u00e1tica.<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span>Processo isot\u00e9rmico<\/span><\/h2>\n<p><span>Um\u00a0<a title=\"Isothermal Process\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-isotermico-definicao\/\"><strong>processo isot\u00e9rmico<\/strong><\/a>\u00a0\u00e9 um\u00a0<a title=\"Thermodynamic Processes\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-termodinamico-definicao\/\"><strong>processo termodin\u00e2mico<\/strong><\/a>\u00a0, no qual a\u00a0<strong>temperatura<\/strong>\u00a0do sistema\u00a0<strong>permanece constante<\/strong>\u00a0(T = const).\u00a0A transfer\u00eancia de calor para dentro ou para fora do sistema geralmente deve ocorrer a uma taxa t\u00e3o lenta, a fim de se ajustar continuamente \u00e0 temperatura do reservat\u00f3rio atrav\u00e9s da troca de calor.\u00a0Em cada um desses estados, o\u00a0<a title=\"Thermal Equilibrium\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-temperature-physics\/thermal-equilibrium\/\"><strong>equil\u00edbrio t\u00e9rmico<\/strong><\/a>\u00a0\u00e9 mantido.<\/span><\/p>\n<p><span>Para um\u00a0<\/span><a title=\"Lei do g\u00e1s ideal\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/ideal-gas-law\/\"><strong><span>g\u00e1s ideal<\/span><\/strong>\u00a0<\/a><span>e um processo politr\u00f3pico, o caso\u00a0<\/span><strong><em><span>n = 1<\/span><\/em><\/strong><span>\u00a0corresponde a um processo\u00a0<\/span><strong><span>isot\u00e9rmico<\/span><\/strong><span>\u00a0(temperatura constante).\u00a0Ao contr\u00e1rio do\u00a0<\/span><a title=\"Processo Adiab\u00e1tico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-adiabatico-definicao\/\"><strong><span>processo adiab\u00e1tico<\/span><\/strong><\/a><span>\u00a0, no qual\u00a0<\/span><strong><i><span>n = \u03ba<\/span><\/i><\/strong><em><span>\u00a0\u00a0 e\u00a0<\/span><\/em><em><span>um sistema n\u00e3o trocam calor com o ambiente (Q = 0;\u00a0<\/span><\/em><em><span>\u2206T \u2260 0\u00a0<\/span><\/em><em><span>)\u00a0<\/span><\/em><em><span>, em um processo isot\u00e9rmico n\u00e3o h\u00e1 altera\u00e7\u00e3o na energia interna (devido a \u2206T = 0 ) e, portanto,\u00a0<\/span><\/em><em><span>\u0394U = 0 (para gases ideais) e Q \u2260 0.<\/span><\/em><span>\u00a0Um processo adiab\u00e1tico n\u00e3o \u00e9 necessariamente um processo isot\u00e9rmico, nem um processo isot\u00e9rmico \u00e9 necessariamente adiab\u00e1tico.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0\u00a0<\/span><a title=\"Processo isot\u00e9rmico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-isotermico-definicao\/\"><span>Processo isot\u00e9rmico<\/span><\/a><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boyle-Mariotte-Law.gif\"><img loading=\"lazy\" class=\"size-full wp-image-17319 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boyle-Mariotte-Law.gif\" alt=\"Lei de Boyle-Mariotte\" width=\"532\" height=\"403\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boyle-Mariotte-Law.gif\" \/><\/a><\/p>\n<p><span>Lei de Boyle-Mariotte.\u00a0Para uma massa fixa de g\u00e1s a temperatura constante, o volume \u00e9 inversamente proporcional \u00e0 press\u00e3o.\u00a0Fonte: grc.nasa.gov A pol\u00edtica de direitos autorais da NASA afirma que \u201co material da NASA n\u00e3o \u00e9 protegido por direitos autorais, a menos que seja observado\u201d<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span>Processo isob\u00e1rico<\/span><\/h2>\n<p><span>Um\u00a0<\/span><a title=\"Processo isob\u00e1rico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-processo-isobarico-definicao\/\"><strong><span>processo isob\u00e1rico<\/span><\/strong><\/a><span>\u00a0\u00e9 um\u00a0<\/span><a title=\"Processos termodin\u00e2micos\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-termodinamico-definicao\/\"><span>processo termodin\u00e2mico<\/span><\/a><span>\u00a0, no qual a\u00a0<\/span><a title=\"O que \u00e9 press\u00e3o - F\u00edsica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/\"><strong><span>press\u00e3o<\/span><\/strong><\/a><span>\u00a0do sistema\u00a0<\/span><strong><span>permanece constante<\/span><\/strong><span>\u00a0(p = const).\u00a0A transfer\u00eancia de calor para dentro ou para fora do sistema funciona, mas tamb\u00e9m altera a energia interna do sistema.<\/span><\/p>\n<p><span>Como existem mudan\u00e7as na\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-energia-interna-energia-termica-definicao\/\"><span>energia interna<\/span><\/a><span>\u00a0(dU) e no volume do sistema (\u2206V), os engenheiros costumam usar a\u00a0<\/span><a title=\"O que \u00e9 entalpia\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-enthalpy\/\"><strong><span>entalpia<\/span><\/strong><\/a><span>\u00a0do sistema, que \u00e9 definida como:<\/span><\/p>\n<p><em><strong><span>H = U + pV<\/span><\/strong><\/em><\/p>\n<p><span>Em muitas an\u00e1lises termodin\u00e2micas, \u00e9 conveniente usar a\u00a0<\/span><strong><span>entalpia em<\/span><\/strong><span>\u00a0vez da energia interna.\u00a0Especialmente no caso da\u00a0<\/span><a title=\"Primeira lei em termos de entalpia dH = dQ + Vdp\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/first-law-of-thermodynamics\/first-law-in-terms-of-enthalpy-dh-dq-vdp\/\"><strong><span>primeira lei da termodin\u00e2mica<\/span><\/strong><\/a><span>\u00a0.<\/span><\/p>\n<p><span>Na engenharia, os dois ciclos termodin\u00e2micos muito importantes (ciclo de\u00a0<\/span><strong><span>Brayton e Rankine<\/span><\/strong><span>\u00a0) s\u00e3o baseados em\u00a0<\/span><strong><span>dois processos isob\u00e1ricos<\/span><\/strong><span>\u00a0; portanto, o estudo desse processo \u00e9 crucial para as usinas de energia.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Processo isob\u00e1rico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-processo-isobarico-definicao\/\"><span>Processo isob\u00e1rico<\/span><\/a><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Charles-Law.gif\"><img loading=\"lazy\" class=\"size-full wp-image-17320 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Charles-Law.gif\" alt=\"A lei de Charles \u00e9 uma das leis de g\u00e1s.\" width=\"533\" height=\"403\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Charles-Law.gif\" \/><\/a><\/p>\n<p><span>Para uma massa fixa de g\u00e1s a press\u00e3o constante, o volume \u00e9 diretamente proporcional \u00e0 temperatura Kelvin.\u00a0Fonte: grc.nasa.gov A pol\u00edtica de direitos autorais da NASA afirma que \u201co material da NASA n\u00e3o \u00e9 protegido por direitos autorais, a menos que seja observado<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span>Processo Isoc\u00f3rico<\/span><\/h2>\n<p><span>Um\u00a0<\/span><a title=\"Processo Isoc\u00f3rico - Processo Isom\u00e9trico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-processo-isocorico-processo-isometrico-definicao\/\"><strong><span>processo isoc\u00f3rico<\/span><\/strong>\u00a0<\/a><span>\u00e9 um processo termodin\u00e2mico, no qual o\u00a0<\/span><strong><span>volume<\/span><\/strong><span>\u00a0do sistema fechado\u00a0<\/span><strong><span>permanece constante<\/span><\/strong><span>\u00a0(V = const).\u00a0Ele descreve o comportamento do g\u00e1s dentro do recipiente, que n\u00e3o pode ser deformado.\u00a0Como o volume permanece constante, a transfer\u00eancia de calor para dentro ou para fora do sistema n\u00e3o\u00a0<\/span><a title=\"Trabalho p\u0394V - Trabalho de Fronteira e Trabalho V\u0394p\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/laws-of-thermodynamics\/first-law-of-thermodynamics\/p%ce%b4v-work-boundary-work-and-v%ce%b4p-work\/\"><span>funciona em p\u2206V<\/span><\/a><span>\u00a0, mas apenas altera a\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-energia-interna-energia-termica-definicao\/\"><strong><span>energia interna<\/span><\/strong><\/a><span>\u00a0(a temperatura) do sistema.<\/span><\/p>\n<p><span>Na engenharia de\u00a0<\/span><strong><span>motores de combust\u00e3o interna<\/span><\/strong><span>\u00a0, os processos isoc\u00f3ricos s\u00e3o muito importantes para seus ciclos termodin\u00e2micos (ciclo Otto e Diesel), portanto, o estudo desse processo \u00e9 crucial para a engenharia automotiva.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0\u00a0<\/span><a title=\"Processo Isoc\u00f3rico - Processo Isom\u00e9trico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-processo-isocorico-processo-isometrico-definicao\/\"><span>Processo isoc\u00f3rico<\/span><\/a><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Guy-Lussac-Law.png\"><img loading=\"lazy\" class=\"size-full wp-image-17321 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Guy-Lussac-Law.png\" alt=\"Lei de Guy-Lussac\" width=\"274\" height=\"301\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Guy-Lussac-Law.png\" \/><\/a><\/p>\n<p><span>Para uma massa fixa de g\u00e1s em volume constante, a press\u00e3o \u00e9 diretamente proporcional \u00e0 temperatura Kelvin<\/span><\/p>\n<p>&nbsp;<\/p>\n<h2><span>Processo Politr\u00f3pico<\/span><\/h2>\n<p><strong><span>Um\u00a0<\/span><a title=\"Processo Politr\u00f3pico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-processo-politropico-definicao\/\"><span>processo politr\u00f3pico<\/span><\/a><span>\u00a0\u00e9 qualquer processo termodin\u00e2mico que pode ser expresso pela seguinte equa\u00e7\u00e3o:<\/span><\/strong><\/p>\n<p><em><strong><span>pV\u00a0<\/span><sup><span>n<\/span><\/sup><span>\u00a0= constante<\/span><\/strong><\/em><\/p>\n<p><span>O\u00a0<\/span><strong><span>processo politr\u00f3pico<\/span><\/strong><span>\u00a0pode descrever a expans\u00e3o e compress\u00e3o de g\u00e1s que\u00a0<\/span><strong><span>incluem transfer\u00eancia de calor<\/span><\/strong><span>\u00a0.\u00a0O expoente\u00a0<\/span><strong><span>n<\/span><\/strong><span>\u00a0\u00e9 conhecido como\u00a0<\/span><strong><span>\u00edndice politr\u00f3pico<\/span><\/strong><span>\u00a0e pode assumir qualquer valor de 0 a \u221e, dependendo do processo espec\u00edfico.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0\u00a0<\/span><a title=\"Processo Politr\u00f3pico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-processo-politropico-definicao\/\"><span>Processo Polytropic<\/span><\/a><\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/polytropic-process-pv-diagram.png\"><img loading=\"lazy\" class=\"size-full wp-image-17462 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/polytropic-process-pv-diagram.png\" alt=\"processo politr\u00f3pico - diagrama pv\" width=\"721\" height=\"551\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/polytropic-process-pv-diagram.png\" \/><\/a><span>Processos politr\u00f3picos com v\u00e1rios \u00edndices politr\u00f3picos<\/span><\/p>\n<p>&nbsp;<\/p>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-first\">\n<div class=\"inside-grid-column\">\n<h2><span>Processo de estrangulamento &#8211; processo isent\u00e1lpico<\/span><\/h2>\n<p><span>Um\u00a0<\/span><a title=\"Processo de estrangulamento - processo isent\u00e1lpico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-de-estrangulamento-processo-isentalpico-definicao\/\"><strong><span>processo de estrangulamento<\/span><\/strong><\/a><span>\u00a0\u00e9 um\u00a0<\/span><a title=\"Processos termodin\u00e2micos\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-termodinamico-definicao\/\"><strong><span>processo termodin\u00e2mico<\/span><\/strong><\/a><span>\u00a0, no qual a\u00a0<\/span><a title=\"O que \u00e9 entalpia\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/what-is-enthalpy\/\"><strong><span>entalpia<\/span><\/strong><\/a><span>\u00a0do g\u00e1s ou do meio\u00a0<\/span><strong><span>permanece constante (h = const)<\/span><\/strong><span>\u00a0.\u00a0De fato, o\u00a0<\/span><strong><span>processo de estrangulamento<\/span><\/strong><span>\u00a0\u00e9 um dos\u00a0<\/span><strong><span>processos isent\u00e1licos<\/span><\/strong><span>\u00a0.\u00a0Durante o processo de estrangulamento,\u00a0<\/span><strong><span>nenhum trabalho<\/span><\/strong><span>\u00a0\u00e9 realizado pelo sistema (dW = 0) e, geralmente, n\u00e3o\u00a0<\/span><strong><span>h\u00e1 transfer\u00eancia de calor<\/span><\/strong><span>\u00a0(\u00a0<\/span><strong><span>adiab\u00e1tica<\/span><\/strong><span>\u00a0) do ou para o sistema (dQ = 0).\u00a0Por outro lado, o processo de estrangulamento n\u00e3o pode ser isentr\u00f3pico, \u00e9 um\u00a0<\/span><a title=\"Processo irrevers\u00edvel\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-irreversivel-definicao\/\"><strong><span>processo fundamentalmente irrevers\u00edvel<\/span><\/strong><\/a><span>\u00a0.\u00a0Caracter\u00edsticas do processo de estrangulamento:<\/span><\/p>\n<ol>\n<li><span>Transfer\u00eancia sem trabalho<\/span><\/li>\n<li><span>Sem transfer\u00eancia de calor<\/span><\/li>\n<li><span>Processo irrevers\u00edvel<\/span><\/li>\n<li><span>Processo isent\u00e1lpico<\/span><\/li>\n<\/ol>\n<p><a title=\"Regulagem do vapor \u00famido\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-processes\/throttling-process-isenthalpic-process\/throttling-of-wet-steam\/\"><span>A limita\u00e7\u00e3o do vapor \u00famido<\/span><\/a><span>\u00a0tamb\u00e9m est\u00e1 associada \u00e0\u00a0<\/span><strong><span>conserva\u00e7\u00e3o da entalpia<\/span><\/strong><span>\u00a0.\u00a0Mas, neste caso, uma\u00a0<\/span><strong><span>redu\u00e7\u00e3o na press\u00e3o<\/span><\/strong><span>\u00a0causa um\u00a0<\/span><strong><span>aumento na qualidade do vapor<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>Vide tamb\u00e9m:\u00a0<\/span><a title=\"Processo de estrangulamento - processo isent\u00e1lpico\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-de-estrangulamento-processo-isentalpico-definicao\/\"><span>Processo de limita\u00e7\u00e3o<\/span><\/a><\/p>\n<\/div>\n<\/div>\n<div class=\"lgc-column lgc-grid-parent lgc-grid-50 lgc-tablet-grid-50 lgc-mobile-grid-100 lgc-equal-heights  lgc-last\">\n<div class=\"inside-grid-column\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-hs-diagram-steam.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-17502 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-hs-diagram-steam.png\" alt=\"processo de estrangulamento - diagrama hs - steam\" width=\"574\" height=\"464\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-hs-diagram-steam.png\" \/><\/a><\/div>\n<\/div>\n<p>&nbsp;<\/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>Um processo termodin\u00e2mico \u00e9 definido como uma mudan\u00e7a de um macroestado de equil\u00edbrio para outro macroestado. O conhecimento dos processos termodin\u00e2micos \u00e9 da maior import\u00e2ncia para os engenheiros. Engenharia T\u00e9rmica Processos termodin\u00e2micos Um\u00a0processo termodin\u00e2mico\u00a0\u00e9 definido como uma mudan\u00e7a de um macroestado de equil\u00edbrio para outro macroestado.\u00a0Os\u00a0estados\u00a0inicial\u00a0e\u00a0final\u00a0s\u00e3o os elementos definidores do processo.\u00a0Durante um tal processo, um &#8230; <a title=\"O que \u00e9 processo termodin\u00e2mico &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-termodinamico-definicao\/\" aria-label=\"More on O que \u00e9 processo termodin\u00e2mico &#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 termodin\u00e2mico - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Um processo termodin\u00e2mico \u00e9 definido como uma mudan\u00e7a de um macroestado de equil\u00edbrio para outro macroestado. 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