{"id":51990,"date":"2020-02-02T09:57:09","date_gmt":"2020-02-02T08:57:09","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-definicao-de-fluido-definicao\/"},"modified":"2020-02-02T09:58:03","modified_gmt":"2020-02-02T08:58:03","slug":"o-que-e-definicao-de-fluido-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-definicao-de-fluido-definicao\/","title":{"rendered":"O que \u00e9 Defini\u00e7\u00e3o de Fluido &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Por defini\u00e7\u00e3o, um material fluido n\u00e3o possui rigidez.\u00a0O fluido \u00e9 uma subst\u00e2ncia que se deforma continuamente (flui) sob uma tens\u00e3o de cisalhamento aplicada.\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>Defini\u00e7\u00e3o de Fluido<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Definition-of-Fluid.png\"><img loading=\"lazy\" class=\"alignright size-full wp-image-14194 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Definition-of-Fluid.png\" alt=\"Defini\u00e7\u00e3o de Fluido\" width=\"181\" height=\"263\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Definition-of-Fluid.png\" \/><\/a>Na f\u00edsica, um fluido \u00e9 uma subst\u00e2ncia que se deforma continuamente (flui) sob uma tens\u00e3o de cisalhamento aplicada.\u00a0A caracter\u00edstica que distingue um fluido de um s\u00f3lido \u00e9 sua incapacidade de resistir \u00e0 deforma\u00e7\u00e3o sob uma tens\u00e3o de cisalhamento aplicada (uma for\u00e7a tangencial por unidade de \u00e1rea).\u00a0Os l\u00edquidos s\u00e3o um subconjunto das fases da mat\u00e9ria e incluem l\u00edquidos, gases, plasmas e, em certa medida, s\u00f3lidos pl\u00e1sticos.<\/p>\n<p>Por defini\u00e7\u00e3o, um material s\u00f3lido \u00e9 r\u00edgido.\u00a0Por exemplo, se algu\u00e9m impor uma tens\u00e3o de cisalhamento em um bloco s\u00f3lido de a\u00e7o, o bloco n\u00e3o come\u00e7ar\u00e1 a mudar de forma at\u00e9 que uma quantidade extrema de tens\u00e3o seja aplicada.\u00a0Para ser mais exato, quando uma tens\u00e3o de cisalhamento \u00e9 aplicada pela primeira vez a um material r\u00edgido, ela se deforma levemente, mas depois volta \u00e0 sua forma original quando a tens\u00e3o \u00e9 aliviada.<\/p>\n<figure id=\"attachment_14172\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-14172\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boiling-point-of-water.png\"><img loading=\"lazy\" class=\"size-medium wp-image-14172 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boiling-point-of-water-300x255.png\" alt=\"Diagrama de fases da \u00e1gua\" width=\"300\" height=\"255\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Boiling-point-of-water-300x255.png\" \/><\/a><figcaption id=\"caption-attachment-14172\" class=\"wp-caption-text\">Diagrama de fases da \u00e1gua.<br \/>\nFonte: wikipedia.org CC BY-SA<\/figcaption><\/figure>\n<p>Um material pl\u00e1stico, como argila, tamb\u00e9m possui algum grau de rigidez.\u00a0No entanto, a tens\u00e3o cr\u00edtica de cisalhamento acima da qual produz \u00e9 relativamente pequena e, uma vez excedida essa tens\u00e3o, o material se deforma de forma cont\u00ednua e irrevers\u00edvel e n\u00e3o recupera<br \/>\nsua forma original quando a tens\u00e3o \u00e9 aliviada.<\/p>\n<p>Por defini\u00e7\u00e3o, um material fluido n\u00e3o possui rigidez.\u00a0Por exemplo, se algu\u00e9m impuser uma tens\u00e3o de cisalhamento a um elemento fluido, o elemento fluido se deforma, porque \u00e9 incapaz de suportar qualquer tend\u00eancia de uma tens\u00e3o de cisalhamento aplicada a mudar sua forma.\u00a0Al\u00e9m disso, quanto mais tens\u00e3o \u00e9 aplicada, mais o elemento fluido se deforma.\u00a0Isso nos fornece um recurso caracter\u00edstico de l\u00edquidos (e gases &#8211; l\u00edquidos, em geral) que os distingue de outras formas de mat\u00e9ria e, portanto, podemos dar uma defini\u00e7\u00e3o formal.<\/p>\n<p>Existem dois tipos de fluido: l\u00edquidos e gases.\u00a0A diferen\u00e7a mais importante entre esses dois tipos de fluido est\u00e1 em sua relativa compressibilidade.\u00a0Os gases podem ser comprimidos com muito mais facilidade do que l\u00edquidos.\u00a0Consequentemente, qualquer movimento que envolva varia\u00e7\u00f5es significativas de press\u00e3o \u00e9 geralmente acompanhado por mudan\u00e7as muito maiores na densidade de massa no caso de um g\u00e1s do que no caso de um l\u00edquido.<\/p>\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>\u00c1gua como fluido de refrigera\u00e7\u00e3o do reator<\/span><\/h2>\n<p><strong><span>\u00c1gua e vapor<\/span><\/strong><span>\u00a0s\u00e3o um fluido comum usado para\u00a0<\/span><strong><span>a troca de calor<\/span><\/strong><span>\u00a0no circuito prim\u00e1rio (da superf\u00edcie das barras de combust\u00edvel ao fluxo do l\u00edquido de refrigera\u00e7\u00e3o) e no circuito secund\u00e1rio.\u00a0\u00c9 utilizado devido \u00e0 sua\u00a0<\/span><strong><span>disponibilidade<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>alta capacidade de calor,<\/span><\/strong><span>\u00a0tanto para refrigera\u00e7\u00e3o quanto para aquecimento.\u00a0\u00c9 especialmente eficaz para transportar calor atrav\u00e9s da\u00a0<\/span><strong><span>vaporiza\u00e7\u00e3o<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>condensa\u00e7\u00e3o<\/span><\/strong><span>\u00a0da \u00e1gua devido ao seu\u00a0<\/span><strong><span>calor latente muito grande de vaporiza\u00e7\u00e3o<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>Uma desvantagem \u00e9 que os reatores moderados a \u00e1gua precisam usar\u00a0<\/span><strong><span>o circuito prim\u00e1rio de alta press\u00e3o<\/span><\/strong><span>\u00a0para manter a \u00e1gua no\u00a0<\/span><strong><span>estado l\u00edquido<\/span><\/strong><span>\u00a0e para obter efici\u00eancia termodin\u00e2mica suficiente.\u00a0\u00c1gua e vapor tamb\u00e9m reagem com metais comumente encontrados em ind\u00fastrias como a\u00e7o e cobre, que s\u00e3o oxidados mais rapidamente por \u00e1gua e vapor n\u00e3o tratados.\u00a0Em quase todas as centrais t\u00e9rmicas (carv\u00e3o, g\u00e1s, nuclear), a \u00e1gua \u00e9 usada como fluido de trabalho (usado em um circuito fechado entre caldeira, turbina a vapor e condensador) e o l\u00edquido de arrefecimento (usado para trocar o calor residual por um corpo de \u00e1gua) ou carregue-o por evapora\u00e7\u00e3o em uma torre de resfriamento).<\/span><\/p>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\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-spacer\"><\/div>\n<h2><span>\u00c1gua como moderador<\/span><\/h2>\n<p><a title=\"Moderador de n\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/neutron-moderator\/\"><span>O moderador de n\u00eautrons<\/span><\/a><span>\u00a0, que \u00e9 importante em\u00a0<\/span><strong><span>reatores t\u00e9rmicos<\/span><\/strong><span>\u00a0, \u00e9 usado para moderar, ou seja, desacelerar os n\u00eautrons da\u00a0<\/span><a title=\"Fic\u00e3o nuclear\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/fission\/\"><span>fiss\u00e3o<\/span><\/a><span>\u00a0para as\u00a0<\/span><a title=\"Energia de n\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/neutron-energy\/\"><span>energias t\u00e9rmicas<\/span><\/a><span>\u00a0.\u00a0N\u00facleos com\u00a0<\/span><strong><span>baixo n\u00famero de massa<\/span><\/strong><span>\u00a0s\u00e3o mais eficazes para essa finalidade, portanto, o moderador \u00e9 sempre um material com baixo n\u00famero de massa.\u00a0Os moderadores comumente usados \u200b\u200bincluem \u00e1gua regular\u00a0<\/span><strong><span>(leve)<\/span><\/strong><span>\u00a0(aproximadamente 75% dos reatores do mundo),\u00a0<\/span><strong><span>grafite<\/span><\/strong><span>\u00a0s\u00f3lida\u00a0(20% dos reatores) e\u00a0<\/span><strong><span>\u00e1gua pesada<\/span><\/strong><span>\u00a0(5% dos reatores).<\/span><\/p>\n<p><strong><span>Na maioria dos reatores nucleares<\/span><\/strong><span>\u00a0, a \u00e1gua \u00e9\u00a0<\/span><strong><span>um refrigerante e um moderador<\/span><\/strong><span>\u00a0.\u00a0A modera\u00e7\u00e3o ocorre especialmente nos n\u00facleos de hidrog\u00eanio.\u00a0No caso do\u00a0<\/span><strong><span>hidrog\u00eanio<\/span><\/strong><span>\u00a0(A = 1) como n\u00facleo alvo, o n\u00eautron incidente pode ser completamente interrompido &#8211; possui o maior\u00a0<\/span><a title=\"Diminui\u00e7\u00e3o m\u00e9dia da energia logar\u00edtmica\" href=\"https:\/\/www.nuclear-power.com\/glossary\/neutron-moderatoraverage-logarithmic-energy-decrement\/\"><span>decr\u00e9scimo m\u00e9dio de energia logar\u00edtmica m\u00e9dio<\/span><\/a><span>\u00a0de todos os n\u00facleos.\u00a0Por outro lado, os n\u00facleos de hidrog\u00eanio t\u00eam\u00a0<\/span><a title=\"Se\u00e7\u00e3o transversal de absor\u00e7\u00e3o de n\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/nuclear-engineering-fundamentals\/neutron-nuclear-reactions\/neutron-absorption\/neutron-absorption-cross-section\/\"><span>se\u00e7\u00e3o transversal de absor\u00e7\u00e3o<\/span><\/a><span>\u00a0relativamente maior\u00a0, portanto a \u00e1gua n\u00e3o \u00e9 o melhor moderador de acordo com\u00a0<\/span><a title=\"Raz\u00e3o Moderadora - RM\" href=\"https:\/\/www.nuclear-power.com\/glossary\/moderating-ratio-mr\/\"><span>a raz\u00e3o moderadora<\/span><\/a><span>\u00a0.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Neutron-Moderators-Parameters.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-13684 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Neutron-Moderators-Parameters.png\" alt=\"Moderadores de n\u00eautrons - Par\u00e2metros\" width=\"666\" height=\"510\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Neutron-Moderators-Parameters.png\" \/><\/a><\/p>\n<div class=\"su-divider su-divider-style-dotted\"><\/div>\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-spacer\"><\/div>\n<h2><span>\u00c1gua como blindagem de n\u00eautrons<\/span><\/h2>\n<figure id=\"attachment_12727\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-12727\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/shielding_neutrons.png\"><img loading=\"lazy\" class=\"size-medium wp-image-12727 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/shielding_neutrons-300x275.png\" alt=\"Blindagem da radia\u00e7\u00e3o de n\u00eautrons\" width=\"300\" height=\"275\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/shielding_neutrons-300x275.png\" \/><\/a><figcaption id=\"caption-attachment-12727\" class=\"wp-caption-text\"><span>\u00c1gua como escudo de n\u00eautrons<\/span><\/figcaption><\/figure>\n<p><span>A \u00e1gua devido ao alto teor de hidrog\u00eanio e \u00e0 disponibilidade\u00a0<\/span><strong><span>\u00e9<\/span><\/strong><span>\u00a0uma\u00a0<\/span><strong><span>prote\u00e7\u00e3o\u00a0<\/span><\/strong><span><strong>efetiva<\/strong>\u00a0e comum aos\u00a0<strong>n\u00eautrons<\/strong>\u00a0.\u00a0No entanto, devido ao baixo n\u00famero at\u00f4mico de hidrog\u00eanio e oxig\u00eanio, a \u00e1gua n\u00e3o \u00e9 um escudo aceit\u00e1vel contra os raios gama.\u00a0Por outro lado, em alguns casos, essa desvantagem (baixa densidade) pode ser compensada pela alta espessura da prote\u00e7\u00e3o da \u00e1gua.\u00a0No caso de n\u00eautrons, a \u00e1gua modera perfeitamente os n\u00eautrons, mas com a absor\u00e7\u00e3o de n\u00eautrons pelos raios gama secund\u00e1rios do n\u00facleo de hidrog\u00eanio com alta energia s\u00e3o produzidos.\u00a0Esses raios gama penetram muito na mat\u00e9ria e, portanto, podem aumentar os requisitos de espessura da prote\u00e7\u00e3o da \u00e1gua.\u00a0Adicionando um\u00a0\u00a0<\/span><a title=\"\u00c1cido b\u00f3rico - cal\u00e7o qu\u00edmico\" href=\"https:\/\/www.nuclear-power.com\/glossary\/boron-10\/boric-acid-chemical-shim\/\"><span>\u00e1cido b\u00f3rico<\/span><\/a><span>\u00a0pode ajudar com esse problema (absor\u00e7\u00e3o de n\u00eautrons nos n\u00facleos de boro sem forte emiss\u00e3o gama), mas resulta em outros problemas com a corros\u00e3o dos materiais de constru\u00e7\u00e3o.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\u00a0<\/span><a title=\"Blindagem da radia\u00e7\u00e3o de n\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/atomic-nuclear-physics\/fundamental-particles\/neutron\/shielding-neutron-radiation\/\"><span>Blindagem de n\u00eautrons<\/span><\/a><\/p>\n<p>&nbsp;<\/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 tabindex=\"0\" role=\"button\">\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","protected":false},"excerpt":{"rendered":"<p>Por defini\u00e7\u00e3o, um material fluido n\u00e3o possui rigidez.\u00a0O fluido \u00e9 uma subst\u00e2ncia que se deforma continuamente (flui) sob uma tens\u00e3o de cisalhamento aplicada.\u00a0Engenharia T\u00e9rmica Defini\u00e7\u00e3o de Fluido Na f\u00edsica, um fluido \u00e9 uma subst\u00e2ncia que se deforma continuamente (flui) sob uma tens\u00e3o de cisalhamento aplicada.\u00a0A caracter\u00edstica que distingue um fluido de um s\u00f3lido \u00e9 sua &#8230; <a title=\"O que \u00e9 Defini\u00e7\u00e3o de Fluido &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-definicao-de-fluido-definicao\/\" aria-label=\"More on O que \u00e9 Defini\u00e7\u00e3o de Fluido &#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 Defini\u00e7\u00e3o de Fluido - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Por defini\u00e7\u00e3o, um material fluido n\u00e3o possui rigidez. 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O fluido \\u00e9 uma subst\\u00e2ncia que se deforma continuamente (flui) sob uma tens\\u00e3o de cisalhamento aplicada. 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