{"id":48769,"date":"2019-11-12T04:04:18","date_gmt":"2019-11-12T03:04:18","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-a-linha-pseudocritica-pontos-pseudocriticos-definicao\/"},"modified":"2020-01-30T12:19:05","modified_gmt":"2020-01-30T11:19:05","slug":"o-que-e-a-linha-pseudocritica-pontos-pseudocriticos-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-linha-pseudocritica-pontos-pseudocriticos-definicao\/","title":{"rendered":"O que \u00e9 a linha pseudocr\u00edtica &#8211; Pontos pseudocr\u00edticos &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">A linha pseudocr\u00edtica consiste em pontos pseudocr\u00edticos, que s\u00e3o pontos a uma press\u00e3o acima da press\u00e3o cr\u00edtica e a uma temperatura (Tpc&gt; Tcr).<\/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>Fluido Supercr\u00edtico &#8211; \u00c1gua Supercr\u00edtica<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/pseudocritical-line-pseudocritical-points-chart.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16214 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/pseudocritical-line-pseudocritical-points-chart-300x289.png\" alt=\"Linha pseudocr\u00edtica - Pontos pseudocr\u00edticos\" width=\"300\" height=\"289\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/pseudocritical-line-pseudocritical-points-chart-300x289.png\" \/><\/a><strong>Linha\u00a0<\/strong><strong>pseudocr\u00edtica<\/strong>\u00a0&#8211;\u00a0<strong>pontos pseudocr\u00edticos<\/strong>\u00a0.\u00a0A linha pseudocr\u00edtica consiste em pontos pseudocr\u00edticos, que s\u00e3o pontos a uma press\u00e3o acima da press\u00e3o cr\u00edtica e a uma temperatura (T\u00a0<sub>pc<\/sub>\u00a0&gt; T\u00a0<sub>cr<\/sub>\u00a0) correspondente ao valor m\u00e1ximo do calor espec\u00edfico a essa press\u00e3o espec\u00edfica.<\/p>\n<p>Em press\u00f5es acima da press\u00e3o cr\u00edtica, as propriedades da \u00e1gua no reator mudam\u00a0<strong>gradualmente<\/strong>\u00a0e\u00a0<strong>continuamente<\/strong>\u00a0daquelas que normalmente associamos a um\u00a0<strong>l\u00edquido<\/strong>\u00a0(alta densidade, pequena compressibilidade) para as de um\u00a0<strong>g\u00e1s<\/strong>\u00a0(baixa densidade, grande compressibilidade)\u00a0<strong>sem uma mudan\u00e7a de fase<\/strong>\u00a0.\u00a0N\u00e3o h\u00e1 mudan\u00e7a na fase da \u00e1gua no n\u00facleo.\u00a0Por outro lado, propriedades f\u00edsicas como densidade, calor espec\u00edfico e entalpia espec\u00edfica sofrem altera\u00e7\u00f5es significativas, principalmente na faixa de temperatura da\u00a0<strong>regi\u00e3o pseudocr\u00edtica<\/strong>\u00a0(para 25 MPa entre 372 \u00b0 C e 392 \u00b0 C).\u00a0Por exemplo, em um reator de \u00e1gua supercr\u00edtico t\u00edpico:<\/p>\n<ul>\n<li>a\u00a0<strong>densidade<\/strong>\u00a0da \u00e1gua supercr\u00edtica na entrada e na sa\u00edda \u00e9 de cerca de\u00a0<strong>777 kg \/ m\u00a0<\/strong><sup><strong>3<\/strong>\u00a0<\/sup>\u00a0(por 25MPa e 280 \u00b0 C) e\u00a0<strong>90 kg \/ m\u00a0<sup>3<\/sup><\/strong>\u00a0(por 25MPa e 500 \u00b0 C),<\/li>\n<li>a\u00a0<strong>entalpia espec\u00edfica<\/strong>\u00a0da \u00e1gua supercr\u00edtica na entrada e na sa\u00edda \u00e9 de cerca de\u00a0<strong>1230 kJ \/ kg<\/strong>\u00a0(para 25MPa e 280 \u00b0 C) e\u00a0<strong>3165 kJ \/ kg<\/strong>\u00a0(para 25MPa e 500 \u00b0 C)<\/li>\n<\/ul>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Supercritical-fluid-specific-heat-conductivity.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16211 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Supercritical-fluid-specific-heat-conductivity-182x300.png\" alt=\"condutividade t\u00e9rmica espec\u00edfica do fluido supercr\u00edtico\" width=\"182\" height=\"300\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Supercritical-fluid-specific-heat-conductivity-182x300.png\" \/><\/a>As figuras a seguir mostram o comportamento das propriedades termof\u00edsicas da \u00e1gua perto dos pontos cr\u00edticos (22,1MPa) e pseudocr\u00edtico (25MPa).\u00a0Perto do ponto cr\u00edtico, essas mudan\u00e7as de propriedade s\u00e3o dram\u00e1ticas.\u00a0Nas proximidades do ponto pseudocr\u00edtico de 25 MPa, essas altera\u00e7\u00f5es de propriedade tornam-se menos significativas.\u00a0Em 25 MPa, as mudan\u00e7as mais significativas nas propriedades ocorrem dentro de \u00b1 25 \u00b0 C em torno do ponto pseudocr\u00edtico (389,4 \u00b0 C), essa regi\u00e3o \u00e9 conhecida como regi\u00e3o pseudocr\u00edtica.\u00a0Por conveni\u00eancia, abaixo do ponto pseudocr\u00edtico, as propriedades do fluido s\u00e3o consideradas como apresentando\u00a0comportamento\u00a0<strong>semelhante<\/strong>\u00a0ao\u00a0<strong>l\u00edquido<\/strong>\u00a0e, acima do ponto pseudocr\u00edtico, s\u00e3o consideradas como apresentando\u00a0comportamento\u00a0<strong>semelhante<\/strong>\u00a0ao\u00a0<strong>g\u00e1s<\/strong>\u00a0.<\/p>\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\">\n<div class=\"su-accordion\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-arrow\" data-anchor=\"References\">\n<div class=\"su-spoiler-content su-clearfix\">\n<p>&nbsp;<\/p>\n<\/div>\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<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>A linha pseudocr\u00edtica consiste em pontos pseudocr\u00edticos, que s\u00e3o pontos a uma press\u00e3o acima da press\u00e3o cr\u00edtica e a uma temperatura (Tpc&gt; Tcr). Fluido Supercr\u00edtico &#8211; \u00c1gua Supercr\u00edtica Linha\u00a0pseudocr\u00edtica\u00a0&#8211;\u00a0pontos pseudocr\u00edticos\u00a0.\u00a0A linha pseudocr\u00edtica consiste em pontos pseudocr\u00edticos, que s\u00e3o pontos a uma press\u00e3o acima da press\u00e3o cr\u00edtica e a uma temperatura (T\u00a0pc\u00a0&gt; T\u00a0cr\u00a0) correspondente ao valor &#8230; <a title=\"O que \u00e9 a linha pseudocr\u00edtica &#8211; Pontos pseudocr\u00edticos &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-linha-pseudocritica-pontos-pseudocriticos-definicao\/\" aria-label=\"More on O que \u00e9 a linha pseudocr\u00edtica &#8211; Pontos pseudocr\u00edticos &#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 - 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