{"id":47507,"date":"2019-11-05T06:20:26","date_gmt":"2019-11-05T05:20:26","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-coeficiente-de-arrasto-caracteristicas-de-arrasto-definicao\/"},"modified":"2020-01-23T14:56:12","modified_gmt":"2020-01-23T13:56:12","slug":"o-que-e-coeficiente-de-arrasto-caracteristicas-de-arrasto-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-coeficiente-de-arrasto-caracteristicas-de-arrasto-definicao\/","title":{"rendered":"O que \u00e9 coeficiente de arrasto &#8211; Caracter\u00edsticas de arrasto &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Coeficiente de arrasto &#8211; Caracter\u00edsticas de arrasto.\u00a0As caracter\u00edsticas de arrasto de um corpo s\u00e3o representadas pelo coeficiente de arrasto sem dimens\u00e3o, CD, definido como:<\/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>Coeficiente de arrasto &#8211; Caracter\u00edsticas de arrasto<\/h2>\n<p>Como foi escrito, as\u00a0<strong>caracter\u00edsticas<\/strong>\u00a0de\u00a0<strong>arrasto<\/strong>\u00a0de um corpo s\u00e3o representadas pelo\u00a0<strong>coeficiente de arrasto sem<\/strong>\u00a0dimens\u00e3o\u00a0<strong>, C\u00a0<\/strong><strong><sub>D<\/sub><\/strong><strong>\u00a0,<\/strong>\u00a0definido como:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-characteristics.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20496 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-characteristics.png\" alt=\"coeficiente de arrasto - caracter\u00edsticas\" width=\"266\" height=\"285\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-characteristics.png\" \/><\/a><\/p>\n<p>A \u00e1rea de refer\u00eancia, A, \u00e9 definida como a \u00e1rea da proje\u00e7\u00e3o ortogr\u00e1fica do objeto em um plano perpendicular \u00e0 dire\u00e7\u00e3o do movimento.\u00a0Para objetos ocos, a \u00e1rea de refer\u00eancia pode ser significativamente maior que a \u00e1rea de se\u00e7\u00e3o transversal, mas para objetos n\u00e3o ocos, \u00e9 exatamente o mesmo que uma \u00e1rea de se\u00e7\u00e3o transversal.\u00a0Como pode ser visto, o coeficiente de arrasto \u00e9 principalmente uma fun\u00e7\u00e3o da forma do corpo e levando em considera\u00e7\u00e3o o atrito da pele e o arrasto da forma.\u00a0Tamb\u00e9m pode depender do\u00a0<a title=\"N\u00famero de Reynolds\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/reynolds-number\/\">n\u00famero de Reynolds<\/a>\u00a0e da rugosidade da superf\u00edcie.<\/p>\n<p>Quando os\u00a0<strong>coeficientes de\u00a0<\/strong><strong>atrito<\/strong>\u00a0e\u00a0<strong>press\u00e3o<\/strong>\u00a0est\u00e3o dispon\u00edveis, o\u00a0<strong>coeficiente de arrasto total<\/strong>\u00a0\u00e9 determinado simplesmente adicionando-os:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-form-drag-coefficients.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20488 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-form-drag-coefficients.png\" alt=\"atrito da pele - arrasto da forma - coeficientes\" width=\"308\" height=\"54\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-form-drag-coefficients.png\" \/><\/a><\/p>\n<p>Em n\u00fameros baixos de Reynolds, a maior parte do arrasto ocorre devido ao\u00a0<strong>atrito<\/strong>\u00a0.\u00a0Este \u00e9 especialmente o caso de corpos altamente aerodin\u00e2micos, como aerof\u00f3lios.\u00a0Por outro lado, no alto n\u00famero de Reynolds, a queda de press\u00e3o \u00e9 significativa, o que aumenta o\u00a0<strong>arrasto do formul\u00e1rio<\/strong> .<\/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>For\u00e7a de arrasto &#8211; Equa\u00e7\u00e3o de arrasto<\/span><\/h2>\n<p><span>A\u00a0<\/span><strong><span>for\u00e7a de arrasto,\u00a0<\/span><\/strong><strong><span>F\u00a0<\/span><sub><span>D<\/span><\/sub><\/strong><span>\u00a0, depende da\u00a0<\/span><a title=\"O que \u00e9 densidade - F\u00edsica\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-density-physics\/\"><span>densidade<\/span><\/a><span>\u00a0do fluido, a velocidade a montante, e o tamanho, forma e orienta\u00e7\u00e3o do corpo, entre outras coisas.\u00a0Uma maneira de expressar isso \u00e9 por meio da\u00a0<\/span><strong><span>equa\u00e7\u00e3o de arrasto<\/span><\/strong><span>\u00a0.\u00a0A\u00a0<\/span><strong><span>equa\u00e7\u00e3o de arrasto<\/span><\/strong><span>\u00a0\u00e9 uma f\u00f3rmula usada para calcular a\u00a0<\/span><strong><span>for\u00e7a de arrasto<\/span><\/strong><span>\u00a0experimentada por um objeto devido ao movimento atrav\u00e9s de um fluido.<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-formula.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20495 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-formula.png\" alt=\"for\u00e7a de arrasto - equa\u00e7\u00e3o de arrasto - f\u00f3rmula\" width=\"261\" height=\"257\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-formula.png\" \/><\/a><\/p>\n<p><span>A \u00e1rea de refer\u00eancia, A, \u00e9 definida como a \u00e1rea da proje\u00e7\u00e3o ortogr\u00e1fica do objeto em um plano perpendicular \u00e0 dire\u00e7\u00e3o do movimento.\u00a0Para objetos ocos, a \u00e1rea de refer\u00eancia pode ser significativamente maior que a \u00e1rea de se\u00e7\u00e3o transversal, mas para objetos n\u00e3o ocos, \u00e9 exatamente o mesmo que uma \u00e1rea de se\u00e7\u00e3o transversal.<\/span><\/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-spacer\"><\/div>\n<h2><span>C\u00e1lculo do coeficiente de atrito da pele<\/span><\/h2>\n<p><strong><span>O fator de atrito<\/span><\/strong><span>\u00a0para escoamento turbulento depende fortemente da\u00a0<\/span><strong><span>rugosidade relativa.\u00a0<\/span><\/strong><span>\u00c9 determinado pela equa\u00e7\u00e3o de Colebrook ou pode ser determinado usando o\u00a0<\/span><a title=\"Moody Diagram\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/moody-diagram\/\"><strong><span>gr\u00e1fico Moody<\/span><\/strong><\/a><span>\u00a0.\u00a0O\u00a0<\/span><strong><span>gr\u00e1fico Moody<\/span><\/strong><span>\u00a0para\u00a0<\/span><strong><span>Re = 575 600<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>\u03b5 \/ D = 5 x 10\u00a0<\/span><\/strong><strong><sup><span>-4<\/span><\/sup><\/strong><span>\u00a0retorna os seguintes valores:<\/span><\/p>\n<ul>\n<li><span>o\u00a0<\/span><a title=\"Fator de atrito de Darcy\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-fator-de-atrito-de-darcy-definicao\/\"><strong><span>fator de atrito de Darcy<\/span><\/strong><\/a><span>\u00a0\u00e9 igual a\u00a0<\/span><strong><span>f\u00a0<\/span><\/strong><strong><sub><span>D<\/span><\/sub><\/strong><strong><span>\u00a0= 0,017<\/span><\/strong><\/li>\n<li><span>o\u00a0<\/span><a title=\"Fator de Fric\u00e7\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/fanning-friction-factor\/\"><strong><span>fator de atrito de Fanning<\/span><\/strong><\/a><span>\u00a0\u00e9 igual a\u00a0<\/span><strong><span>f\u00a0<\/span><\/strong><strong><sub><span>F<\/span><\/sub><\/strong><strong><span>\u00a0= f\u00a0<\/span><\/strong><strong><sub><span>D<\/span><\/sub><\/strong><strong><span>\u00a0\/ 4 = 0,00425<\/span><\/strong><\/li>\n<\/ul>\n<p><span>Portanto, o coeficiente de atrito da pele \u00e9 igual a:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-coefficient-example.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20533 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-coefficient-example.png\" alt=\"coeficiente de atrito da pele - exemplo\" width=\"377\" height=\"186\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-coefficient-example.png\" \/><\/a><\/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-spacer\"><\/div>\n<h2><span>C\u00e1lculo da for\u00e7a de arrasto<\/span><\/h2>\n<p><span>Para calcular a\u00a0<\/span><strong><span>for\u00e7a de arrasto<\/span><\/strong><span>\u00a0, precisamos saber:<\/span><\/p>\n<ul>\n<li><span>o coeficiente de atrito da pele, que \u00e9:\u00a0<\/span><strong><span>C\u00a0<\/span><\/strong><strong><sub><span>D, atrito<\/span><\/sub><\/strong><strong><span>\u00a0= 0,00425<\/span><\/strong><\/li>\n<li><span>a \u00e1rea da superf\u00edcie do pino, que \u00e9:\u00a0<\/span><strong><span>A = \u03c0.dh = 0,11169 m\u00a0<\/span><\/strong><strong><sup><span>2<\/span><\/sup><\/strong><\/li>\n<li><span>a\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/thermodynamics\/thermodynamic-properties\/what-is-density-physics\/\"><span>densidade<\/span><\/a><span>\u00a0do fluido\u00a0, que \u00e9:\u00a0<\/span><strong><span>\u03c1 = 714 kg \/ m\u00a0<\/span><\/strong><strong><sup><span>3<\/span><\/sup><\/strong><\/li>\n<li><span>a velocidade de fluxo do n\u00facleo, que \u00e9 constante e igual a\u00a0<\/span><strong><span>V\u00a0<\/span><\/strong><strong><sub><span>core<\/span><\/sub><\/strong><strong><span>\u00a0= 5 m \/ s<\/span><\/strong><\/li>\n<\/ul>\n<p><span>A partir do\u00a0<\/span><strong><span>coeficiente de atrito<\/span><\/strong><span>\u00a0da\u00a0<strong>pele,<\/strong>\u00a0que \u00e9 igual ao\u00a0<\/span><a href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/fanning-friction-factor\/\"><strong><span>fator de atrito de Fanning<\/span><\/strong><\/a><span>\u00a0, podemos calcular o componente de atrito da\u00a0<\/span><strong><span>for\u00e7a de arrasto.\u00a0<\/span><\/strong><span>A for\u00e7a de arrasto \u00e9 dada por:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-example.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20534 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-example.png\" alt=\"for\u00e7a de arrasto - exemplo\" width=\"452\" height=\"72\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-example.png\" \/><\/a><\/p>\n<p><span>Supondo que um conjunto de combust\u00edvel possa ter, por exemplo, 289 pinos de combust\u00edvel (conjunto de combust\u00edvel 17 \u00d7 17), o\u00a0<\/span><strong><span>componente<\/span><\/strong><span>\u00a0de\u00a0<strong>atrito<\/strong>\u00a0da\u00a0<\/span><strong><span>for\u00e7a de arrasto<\/span><\/strong><span>\u00a0\u00e9 da ordem de\u00a0<\/span><strong><span>quilonewtons<\/span><\/strong><span>\u00a0.\u00a0Al\u00e9m disso, essa for\u00e7a de arrasto se origina puramente do atrito da pele no pacote de combust\u00edvel.\u00a0Mas o conjunto t\u00edpico de combust\u00edvel PWR cont\u00e9m outros componentes, que influenciam o sistema hidr\u00e1ulico do conjunto:<\/span><\/p>\n<ul>\n<li><strong><span>Barras de combust\u00edvel<\/span><\/strong><span>\u00a0.\u00a0As barras de combust\u00edvel cont\u00eam o combust\u00edvel e os venenos queimados.<\/span><\/li>\n<li><strong><span>Bico superior<\/span><\/strong><span>\u00a0.\u00a0Fornece o suporte mec\u00e2nico para a estrutura de montagem de combust\u00edvel.<\/span><\/li>\n<li><strong><span>Bico inferior<\/span><\/strong><span>\u00a0.\u00a0Fornece o suporte mec\u00e2nico para a estrutura de montagem de combust\u00edvel.<\/span><\/li>\n<li><strong><span>Grade de espa\u00e7amento<\/span><\/strong><span>\u00a0.\u00a0Garante uma orienta\u00e7\u00e3o exata das barras de combust\u00edvel.<\/span><\/li>\n<li><strong><span>Guie o tubo do dedal<\/span><\/strong><span>\u00a0.\u00a0Tubo vago para hastes de controle ou instrumenta\u00e7\u00e3o interna.<\/span><\/li>\n<\/ul>\n<p><span>Como foi escrito, o segundo componente da for\u00e7a de arrasto \u00e9 o arrasto do formul\u00e1rio.\u00a0<\/span><strong><span>O arrasto de forma<\/span><\/strong><span>\u00a0conhecido tamb\u00e9m como\u00a0<\/span><strong><span>arrasto de press\u00e3o<\/span><\/strong><span>\u00a0surge devido \u00e0\u00a0<\/span><strong><span>forma<\/span><\/strong><span>\u00a0e\u00a0<\/span><strong><span>tamanho<\/span><\/strong><span>\u00a0do objeto.\u00a0O\u00a0<\/span><strong><span>arrasto de press\u00e3o<\/span><\/strong><span>\u00a0\u00e9 proporcional \u00e0 diferen\u00e7a entre as press\u00f5es que atuam na frente e nas costas do corpo imerso e a \u00e1rea frontal.<\/span><\/p>\n<\/div>\n<\/div>\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","protected":false},"excerpt":{"rendered":"<p>Coeficiente de arrasto &#8211; Caracter\u00edsticas de arrasto.\u00a0As caracter\u00edsticas de arrasto de um corpo s\u00e3o representadas pelo coeficiente de arrasto sem dimens\u00e3o, CD, definido como: Coeficiente de arrasto &#8211; Caracter\u00edsticas de arrasto Como foi escrito, as\u00a0caracter\u00edsticas\u00a0de\u00a0arrasto\u00a0de um corpo s\u00e3o representadas pelo\u00a0coeficiente de arrasto sem\u00a0dimens\u00e3o\u00a0, C\u00a0D\u00a0,\u00a0definido como: A \u00e1rea de refer\u00eancia, A, \u00e9 definida como a \u00e1rea &#8230; <a title=\"O que \u00e9 coeficiente de arrasto &#8211; Caracter\u00edsticas de arrasto &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-coeficiente-de-arrasto-caracteristicas-de-arrasto-definicao\/\" aria-label=\"More on O que \u00e9 coeficiente de arrasto &#8211; Caracter\u00edsticas de arrasto &#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 coeficiente de arrasto - Caracter\u00edsticas de arrasto - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Coeficiente de arrasto - Caracter\u00edsticas de arrasto. 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