{"id":48079,"date":"2019-11-08T01:59:50","date_gmt":"2019-11-08T00:59:50","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-processo-de-estrangulamento-processo-isentalpico-definicao\/"},"modified":"2020-01-27T13:45:34","modified_gmt":"2020-01-27T12:45:34","slug":"o-que-e-processo-de-estrangulamento-processo-isentalpico-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-de-estrangulamento-processo-isentalpico-definicao\/","title":{"rendered":"O que \u00e9 processo de estrangulamento &#8211; processo isent\u00e1lpico &#8211; defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Um processo de estrangulamento \u00e9 um dos processos isent\u00e1licos. Um processo de estrangulamento \u00e9 um processo termodin\u00e2mico, no qual a entalpia do g\u00e1s permanece constante. Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div><\/div>\n<div>\n<h2><span>Processo de estrangulamento &#8211; processo isent\u00e1lpico<\/span><\/h2>\n<p><span>Um\u00a0<\/span><strong><span>processo de estrangulamento<\/span><\/strong><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><span>Um estrangulamento do fluxo causa uma\u00a0<\/span><strong><span>redu\u00e7\u00e3o<\/span><\/strong><span>\u00a0significativa\u00a0<strong>da\u00a0<\/strong><strong><a title=\"What is Pressure \u2013 Physics\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/\">press\u00e3o<\/a><\/strong>\u00a0, porque um dispositivo de estrangulamento causa uma\u00a0<\/span><a title=\"Menor Perda de Cabe\u00e7a - Perdas Locais\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/minor-head-loss-local-losses\/\"><strong><span>perda de press\u00e3o local<\/span><\/strong><\/a><span>\u00a0.\u00a0Uma limita\u00e7\u00e3o pode ser alcan\u00e7ada simplesmente introduzindo uma restri\u00e7\u00e3o em uma linha atrav\u00e9s da qual um g\u00e1s ou l\u00edquido flui.\u00a0Essa restri\u00e7\u00e3o \u00e9 comumente feita por meio de uma v\u00e1lvula parcialmente aberta ou um buj\u00e3o poroso.\u00a0Tais perdas de press\u00e3o s\u00e3o geralmente denominadas\u00a0<\/span><a title=\"Menor Perda de Cabe\u00e7a - Perdas Locais\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/minor-head-loss-local-losses\/\"><strong><span>perdas menores<\/span><\/strong><\/a><span>\u00a0, embora geralmente representem uma parte importante da\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/bernoullis-equation-bernoullis-principle\/head-loss\/\"><span>perda de<\/span><\/a><span>\u00a0carga\u00a0.\u00a0As perdas menores s\u00e3o aproximadamente proporcional ao\u00a0<\/span><strong><span>quadrado da taxa de fluxo<\/span><\/strong><span>\u00a0e, portanto, eles podem ser facilmente integrados na\u00a0<\/span><a title=\"Equa\u00e7\u00e3o de Darcy-Weisbach\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/darcy-weisbach-equation\/\"><span>equa\u00e7\u00e3o de Darcy-Weisbach<\/span><\/a><span>\u00a0atrav\u00e9s de\u00a0<\/span><strong><span>coeficiente de resist\u00eancia K<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/minor-head-loss-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14589 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/minor-head-loss-equation.png\" alt=\"perda de cabe\u00e7a menor - equa\u00e7\u00e3o\" width=\"238\" height=\"72\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/minor-head-loss-equation.png\" \/><\/a><\/p>\n<p><span>Por exemplo, considere a acelera\u00e7\u00e3o de um\u00a0<\/span><a title=\"O que \u00e9 o g\u00e1s ideal\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/ideal-gas-law\/what-is-ideal-gas\/\"><strong><span>g\u00e1s ideal que<\/span><\/strong><\/a><span>\u00a0flui atrav\u00e9s de uma v\u00e1lvula que est\u00e1 parcialmente aberta.\u00a0Pela experi\u00eancia, podemos observar que:\u00a0<\/span><strong><span>p\u00a0<\/span><sub><span>in<\/span><\/sub><span>\u00a0&gt; p\u00a0<\/span><sub><span>out<\/span><\/sub><span>\u00a0, v\u00a0<\/span><sub><span>in<\/span><\/sub><span>\u00a0&lt;v\u00a0<\/span><sub><span>out<\/span><\/sub><\/strong><span>\u00a0, onde\u00a0<\/span><strong><span>p<\/span><\/strong><span>\u00a0\u00e9 a\u00a0<\/span><strong><span>press\u00e3o<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>v<\/span><\/strong><span>\u00a0\u00e9 o\u00a0<\/span><a title=\"O que \u00e9 volume espec\u00edfico\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-specific-volume\/\"><strong><span>volume espec\u00edfico<\/span><\/strong><\/a><span>\u00a0.\u00a0Tamb\u00e9m podemos observar que entalpias espec\u00edficas permanecem as mesmas, ou seja, h\u00a0<\/span><sub><span>in<\/span><\/sub><span>\u00a0= h\u00a0<\/span><sub><span>out<\/span><\/sub><span>\u00a0.<\/span><\/p>\n<p><span>A entalpia espec\u00edfica \u00e9 igual \u00e0\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/what-is-energy-physics\/internal-energy-thermal-energy\/specific-internal-energy\/\"><span>energia interna espec\u00edfica<\/span><\/a><span>\u00a0do sistema mais o produto da\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-pressure-physics\/\"><span>press\u00e3o<\/span><\/a><span>\u00a0e\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-specific-volume\/\"><span>volume espec\u00edfico<\/span><\/a><span>\u00a0.<\/span><\/p>\n<p><strong><em><span>h = u + pv<\/span><\/em><\/strong><\/p>\n<p><span>Portanto, se a press\u00e3o diminuir, o volume espec\u00edfico dever\u00e1 aumentar se a entalpia permanecer constante (supondo que u seja constante).\u00a0Como o fluxo de massa \u00e9 constante, a mudan\u00e7a no volume espec\u00edfico \u00e9 observada como um\u00a0<\/span><strong><span>aumento na velocidade do g\u00e1s<\/span><\/strong><span>\u00a0, e isso tamb\u00e9m \u00e9 verificado por observa\u00e7\u00f5es.<\/span><\/p>\n<p><span>Se houver uma mudan\u00e7a na energia interna, u, deve haver uma\u00a0<\/span><strong><span>mudan\u00e7a de temperatura<\/span><\/strong><span>\u00a0.\u00a0Normalmente a temperatura do fluido cai.\u00a0No entanto, em casos especiais, a temperatura pode permanecer a mesma ou aumentar.<\/span><\/p>\n<\/div>\n<p>&nbsp;<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Throttling-Process-Valve-Plug.png\"><img loading=\"lazy\" class=\"size-full wp-image-17501 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Throttling-Process-Valve-Plug.png\" alt=\"Uma v\u00e1lvula parcialmente aberta ou um tamp\u00e3o poroso\" width=\"321\" height=\"647\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Throttling-Process-Valve-Plug.png\" \/><\/a><\/p>\n<p><span>Uma v\u00e1lvula parcialmente aberta ou um buj\u00e3o poroso pode ser usado para reduzir a press\u00e3o em um sistema.<\/span><\/p>\n<div><\/div>\n<div><\/div>\n<div>\n<h2><span>Efeito Joule-Thomson &#8211; coeficiente de Joule Thomson<\/span><\/h2>\n<p><span>As mudan\u00e7as de temperatura durante o processo de estrangulamento est\u00e3o sujeitas ao \u00a0\u00a0<\/span><strong><span>efeito Joule-Thomson<\/span><\/strong><span>\u00a0.\u00a0\u00c0 temperatura ambiente e press\u00f5es normais, todos os gases, exceto hidrog\u00eanio e h\u00e9lio,\u00a0<\/span><strong><span>esfriam<\/span><\/strong><span>\u00a0durante a expans\u00e3o do g\u00e1s.\u00a0O resfriamento ocorre porque \u00e9 preciso trabalhar para superar a atra\u00e7\u00e3o de longo alcance entre as mol\u00e9culas de g\u00e1s \u00e0 medida que elas se afastam.\u00a0O efeito depende do valor do\u00a0<\/span><strong><span>coeficiente de Joule-Thomson<\/span><\/strong><span>\u00a0, que \u00e9 definido como:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Joule-Thomson-coefficient-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-17505 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Joule-Thomson-coefficient-equation.png\" alt=\"Coeficiente de Joule Thomson - equa\u00e7\u00e3o\" width=\"187\" height=\"91\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Joule-Thomson-coefficient-equation.png\" \/><\/a><\/p>\n<p><span>Uma aplica\u00e7\u00e3o do processo de estrangulamento ocorre em refrigeradores de compress\u00e3o de vapor, onde uma\u00a0<\/span><strong><span>v\u00e1lvula de estrangulamento<\/span><\/strong><span> \u00e9 usada para reduzir a press\u00e3o e reduzir a temperatura do refrigerante da press\u00e3o na sa\u00edda do condensador para a press\u00e3o mais baixa existente no evaporador.<\/span><\/p>\n<\/div>\n<div><\/div>\n<div>\n<h2>Exemplo:\u00a0Regulagem de vapor \u00famido<\/h2>\n<p>Um est\u00e1gio de alta press\u00e3o da turbina a vapor opera em estado estacion\u00e1rio com condi\u00e7\u00f5es de entrada de 6 MPa, t = 275,6 \u00b0 C, x = 1 (ponto C).\u00a0O vapor sai deste est\u00e1gio da turbina a uma press\u00e3o de 1,15 MPa, 186 \u00b0 C ex = 0,87 (ponto D).\u00a0Determine a qualidade do vapor quando regulado entre 1,15 MPa e 1,0 MPa.\u00a0Suponha que o processo seja adiab\u00e1tico e que nenhum trabalho seja realizado pelo sistema.<\/p>\n<p>Veja tamb\u00e9m:\u00a0<a title=\"Tabelas de Vapor - Propriedades Espec\u00edficas da \u00c1gua e Vapor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/steam-tables\/\">Tabelas Steam<\/a><\/p>\n<p><strong>Solu\u00e7\u00e3o:<\/strong><\/p>\n<p>A entalpia para o estado D deve ser calculada usando a qualidade do vapor:<\/p>\n<p><strong><em>h\u00a0<\/em><\/strong><strong><em><sub>D, \u00famido<\/sub><\/em><\/strong><strong><em>\u00a0= h\u00a0<\/em><\/strong><strong><em><sub>D, vapor<\/sub><\/em><\/strong><strong><em>\u00a0x + (1 &#8211; x) h\u00a0<\/em><\/strong><strong><em><sub>D, l\u00edquido<\/sub><\/em><\/strong>\u00a0\u00a0= 2782.\u00a00,87 + (1 &#8211; 0,87).\u00a0790 = 2420 + 103 =<strong>\u00a02523 kJ \/ kg<\/strong><\/p>\n<p>Como \u00e9 um processo isent\u00e1lico, conhecemos a entalpia do ponto T. Nas tabelas de vapor, temos que encontrar a qualidade do vapor usando a mesma equa\u00e7\u00e3o e resolvendo a equa\u00e7\u00e3o para a qualidade do vapor, x:<\/p>\n<p><strong><em>h\u00a0<\/em><\/strong><strong><em><sub>T, \u00famido<\/sub><\/em><\/strong><strong><em>\u00a0= h\u00a0<\/em><\/strong><strong><em><sub>T, vapor<\/sub><\/em><\/strong><strong><em>\u00a0x + (1 &#8211; x) h\u00a0<\/em><\/strong><strong><em><sub>T, l\u00edquido<\/sub><\/em><\/strong><\/p>\n<p>x = (\u00a0<strong><em>h\u00a0<\/em><\/strong><strong><em><sub>T, \u00famido<\/sub><\/em><\/strong><strong><em>\u00a0&#8211; h\u00a0<\/em><\/strong><strong><em><sub>T, l\u00edquido<\/sub><\/em><\/strong>\u00a0) \/ (\u00a0<strong><em>h\u00a0<\/em><\/strong><strong><em><sub>T, vapor<\/sub><\/em><\/strong><strong><em>\u00a0&#8211; h\u00a0<\/em><\/strong><strong><em><sub>T, l\u00edquido<\/sub><\/em><\/strong>\u00a0) = (2523 &#8211; 762) \/ (2777 &#8211; 762) = 0,874 = 87,4%<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-parameters.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-17503 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-parameters.png\" alt=\"processo de estrangulamento - par\u00e2metros\" width=\"319\" height=\"103\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-parameters.png\" \/><\/a><\/p>\n<p>Neste caso do processo de estrangulamento (1,15 MPa a 1MPa), a qualidade do vapor aumenta de 87% para 87,4% e a temperatura diminui de 186 \u00b0 C para 179,9 \u00b0 C.<\/p>\n<\/div>\n<p>&nbsp;<\/p>\n<h2><span>Regulagem do vapor \u00famido<\/span><\/h2>\n<p><a title=\"Vapor Molhado\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/wet-steam\/\"><strong><span>O vapor \u00famido<\/span><\/strong><\/a><span>\u00a0\u00e9 caracterizado pela<\/span><a title=\"Qualidade de Vapor - Fra\u00e7\u00e3o de Secura\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/vapor-quality-dryness-fraction\/\"><strong><span>\u00a0qualidade<\/span><\/strong><\/a><span>\u00a0do<a title=\"Qualidade de Vapor - Fra\u00e7\u00e3o de Secura\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/vapor-quality-dryness-fraction\/\"><strong>\u00a0vapor<\/strong><\/a>\u00a0, que varia de zero a unidade &#8211; intervalo aberto (0,1).\u00a0A limita\u00e7\u00e3o do vapor \u00famido tamb\u00e9m est\u00e1 associada \u00e0<\/span><strong><span>\u00a0conserva\u00e7\u00e3o da entalpia<\/span><\/strong><span>\u00a0.\u00a0A entalpia \u00e9 conservada porque nenhum trabalho \u00e9 realizado pelo sistema (dW = 0) e, geralmente, n\u00e3o h\u00e1 transfer\u00eancia de calor (adiab\u00e1tica) do ou para o sistema (dQ = 0).\u00a0Mas, neste caso, uma<\/span><strong><span>\u00a0redu\u00e7\u00e3o na press\u00e3o<\/span><\/strong><span>\u00a0causa um<\/span><strong><span>\u00a0aumento na qualidade do vapor<\/span><\/strong><span>\u00a0.\u00a0\u00c0 medida que a press\u00e3o cai, parte do l\u00edquido no vapor \u00famido vaporiza e aumenta a qualidade do vapor (ou seja, a fra\u00e7\u00e3o de secura).\u00a0Esse processo ocorre porque a<\/span><a title=\"Satura\u00e7\u00e3o - Ponto de Ebuli\u00e7\u00e3o\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-saturacao-ponto-de-ebulicao-definicao\/\"><strong><span>\u00a0temperatura de satura\u00e7\u00e3o<\/span><\/strong><\/a><span>\u00e9 menor na press\u00e3o mais baixa.\u00a0A temperatura mais baixa, a press\u00e3o mais baixa e o vapor de maior qualidade cont\u00eam a mesma entalpia que o vapor original.<\/span><\/p>\n<p><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><\/p>\n<div><\/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<h2><span>Exemplo: Regulagem de vapor \u00famido<\/span><\/h2>\n<p><span>Um est\u00e1gio de alta press\u00e3o da turbina a vapor opera em estado estacion\u00e1rio com condi\u00e7\u00f5es de entrada de 6 MPa, t = 275,6 \u00b0 C, x = 1 (ponto C).\u00a0O vapor sai deste est\u00e1gio da turbina a uma press\u00e3o de 1,15 MPa, 186 \u00b0 C ex = 0,87 (ponto D).\u00a0Determine a qualidade do vapor quando regulado entre 1,15 MPa e 1,0 MPa.\u00a0Suponha que o processo seja adiab\u00e1tico e que nenhum trabalho seja realizado pelo sistema.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Tabelas de Vapor - Propriedades Espec\u00edficas da \u00c1gua e Vapor\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/steam-tables\/\"><span>Tabelas Steam<\/span><\/a><\/p>\n<p><strong><span>Solu\u00e7\u00e3o:<\/span><\/strong><\/p>\n<p><span>A entalpia para o estado D deve ser calculada usando a qualidade do vapor:<\/span><\/p>\n<p><strong><em><span>h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>D, \u00famido<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>D, vapor<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0x + (1 &#8211; x) h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>D, l\u00edquido<\/span><\/sub><\/em><\/strong><span>\u00a0\u00a0= 2782.\u00a00,87 + (1 &#8211; 0,87).\u00a0790 = 2420 + 103 =<\/span><strong><span>\u00a02523 kJ \/ kg<\/span><\/strong><\/p>\n<p><span>Como \u00e9 um processo isent\u00e1lico, conhecemos a entalpia do ponto T. Nas tabelas de vapor, temos que encontrar a qualidade do vapor usando a mesma equa\u00e7\u00e3o e resolvendo a equa\u00e7\u00e3o para a qualidade do vapor, x:<\/span><\/p>\n<p><strong><em><span>h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>T, \u00famido<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0= h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>T, vapor<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0x + (1 &#8211; x) h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>T, l\u00edquido<\/span><\/sub><\/em><\/strong><\/p>\n<p><span>x = (\u00a0<\/span><strong><em><span>h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>T, \u00famido<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0&#8211; h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>T, l\u00edquido<\/span><\/sub><\/em><\/strong><span>\u00a0) \/ (\u00a0<\/span><strong><em><span>h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>T, vapor<\/span><\/sub><\/em><\/strong><strong><em><span>\u00a0&#8211; h\u00a0<\/span><\/em><\/strong><strong><em><sub><span>T, l\u00edquido<\/span><\/sub><\/em><\/strong><span>\u00a0) = (2523 &#8211; 762) \/ (2777 &#8211; 762) = 0,874 = 87,4%<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-parameters.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-17503 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-parameters.png\" alt=\"processo de estrangulamento - par\u00e2metros\" width=\"319\" height=\"103\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-parameters.png\" \/><\/a><\/p>\n<p><span>Neste caso do processo de estrangulamento (1,15 MPa a 1MPa), a qualidade do vapor aumenta de 87% para 87,4% e a temperatura diminui de 186 \u00b0 C para 179,9 \u00b0 C.<\/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<figure id=\"attachment_17504\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-17504\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-steam-min.png\"><img loading=\"lazy\" class=\"size-full wp-image-17504 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-steam-min.png\" alt=\"Regulagem de vapor \u00famido\" width=\"600\" height=\"600\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/throttling-process-steam-min.png\" \/><\/a><figcaption id=\"caption-attachment-17504\" class=\"wp-caption-text\"><span>A limita\u00e7\u00e3o do vapor \u00famido geralmente causa aumento na qualidade do vapor, aumento da entropia e diminui\u00e7\u00e3o da temperatura.<\/span><\/figcaption><\/figure>\n<\/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\"><\/div>\n<\/div>\n<\/div>\n<div class=\"su-quote su-quote-style-default\">\n<div><\/div>\n<div><\/div>\n<div><\/div>\n<div class=\"su-quote-inner su-clearfix\">&#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;.<\/div>\n<\/div>\n<div>\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<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Um processo de estrangulamento \u00e9 um dos processos isent\u00e1licos. Um processo de estrangulamento \u00e9 um processo termodin\u00e2mico, no qual a entalpia do g\u00e1s permanece constante. Engenharia T\u00e9rmica Processo de estrangulamento &#8211; processo isent\u00e1lpico Um\u00a0processo de estrangulamento\u00a0\u00e9 um\u00a0processo termodin\u00e2mico\u00a0, no qual a\u00a0entalpia\u00a0do g\u00e1s ou do meio\u00a0permanece constante (h = const)\u00a0.\u00a0De fato, o\u00a0processo de estrangulamento\u00a0\u00e9 um dos\u00a0processos &#8230; <a title=\"O que \u00e9 processo de estrangulamento &#8211; processo isent\u00e1lpico &#8211; defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-processo-de-estrangulamento-processo-isentalpico-definicao\/\" aria-label=\"More on O que \u00e9 processo de estrangulamento &#8211; processo isent\u00e1lpico &#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 de estrangulamento - processo isent\u00e1lpico - defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Um processo de estrangulamento \u00e9 um dos processos isent\u00e1licos. 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