{"id":47487,"date":"2019-11-05T04:44:59","date_gmt":"2019-11-05T03:44:59","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-parasitic-drag-definicao\/"},"modified":"2020-01-23T14:52:05","modified_gmt":"2020-01-23T13:52:05","slug":"o-que-e-parasitic-drag-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-parasitic-drag-definicao\/","title":{"rendered":"O que \u00e9 Parasitic Drag &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">O termo arrasto parasit\u00e1rio \u00e9 usado principalmente na aerodin\u00e2mica, uma vez que, para elevar as asas, \u00e9 geralmente pequeno em compara\u00e7\u00e3o com o levantamento. O arrasto parasit\u00e1rio \u00e9 uma combina\u00e7\u00e3o de arrasto de forma, arrasto de atrito da pele e arrasto de interfer\u00eancia. Engenharia T\u00e9rmica<\/div>\n<\/div>\n<div><\/div>\n<div>\n<h2><span>O que \u00e9 Parasitic Drag<\/span><\/h2>\n<p><span>O termo\u00a0<\/span><strong><span>arrasto parasit\u00e1rio<\/span><\/strong><span>\u00a0\u00e9 usado principalmente na aerodin\u00e2mica, uma vez que, para elevar as asas, \u00e9 geralmente pequeno em compara\u00e7\u00e3o com o levantamento.\u00a0<\/span><strong><span>O arrasto parasit\u00e1rio<\/span><\/strong><span>\u00a0\u00e9 uma combina\u00e7\u00e3o de\u00a0<\/span><a title=\"Arrastar formul\u00e1rio - Arrastar press\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/what-is-drag-air-and-fluid-resistance\/form-drag-pressure-drag\/\"><span>arrasto<\/span><\/a><span>\u00a0de\u00a0<a title=\"Arrastar formul\u00e1rio - Arrastar press\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/what-is-drag-air-and-fluid-resistance\/form-drag-pressure-drag\/\">forma<\/a>\u00a0,\u00a0<\/span><a title=\"Atrito na pele - Arrasto por fric\u00e7\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/what-is-drag-air-and-fluid-resistance\/skin-friction-friction-drag\/\"><span>arrasto de atrito da pele<\/span><\/a><span> e arrasto de interfer\u00eancia.<\/span><\/p>\n<\/div>\n<p>&nbsp;<\/p>\n<h2><span>Atrito na pele &#8211; Arrasto por fric\u00e7\u00e3o<\/span><\/h2>\n<p><span>Como foi escrito, um fluido em movimento exerce for\u00e7as tangenciais de cisalhamento na superf\u00edcie devido \u00e0\u00a0<\/span><strong><span>condi\u00e7\u00e3o de n\u00e3o escorregamento<\/span><\/strong><span>\u00a0causada por efeitos viscosos.\u00a0Esse tipo de\u00a0<\/span><strong><span>for\u00e7a<\/span><\/strong><span>\u00a0de\u00a0<strong>arrasto<\/strong>\u00a0depende principalmente da geometria, da rugosidade da superf\u00edcie s\u00f3lida (somente em\u00a0<\/span><a title=\"Fluxo turbulento\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-turbulento-definicao\/\"><span>fluxo turbulento<\/span><\/a><span>\u00a0) e do\u00a0<\/span><a title=\"Regime de fluxo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/flow-regime\/\"><span>tipo de fluxo de fluido<\/span><\/a><span>\u00a0.\u00a0O\u00a0<\/span><strong><span>atrito<\/span><\/strong><span>\u00a0\u00e9 proporcional \u00e0 \u00e1rea da superf\u00edcie.\u00a0Portanto, corpos com uma \u00e1rea de superf\u00edcie maior sofrer\u00e3o um atrito de atrito maior.\u00a0\u00c9 por isso que os avi\u00f5es comerciais reduzem sua \u00e1rea total de superf\u00edcie para economizar combust\u00edvel.\u00a0<\/span><strong><span>O arrasto de atrito<\/span><\/strong><span>\u00a0\u00e9 uma forte fun\u00e7\u00e3o da viscosidade, e um fluido &#8220;idealizado&#8221; com viscosidade zero produziria arrasto de atrito zero, uma vez que a tens\u00e3o de cisalhamento da parede seria zero.<\/span><\/p>\n<p><strong><span>O atrito da pele<\/span><\/strong><span>\u00a0\u00e9 causado pelo arrasto viscoso na camada limite ao redor do objeto.\u00a0As caracter\u00edsticas b\u00e1sicas de todas\u00a0<\/span><strong><span>as camadas limite laminar e turbulenta<\/span><\/strong><span>\u00a0s\u00e3o mostradas no fluxo em desenvolvimento sobre uma placa plana.\u00a0Os est\u00e1gios da forma\u00e7\u00e3o da camada limite s\u00e3o mostrados na figura abaixo:<\/span><\/p>\n<p><span>Existem duas maneiras de\u00a0<\/span><strong><span>diminuir a resist\u00eancia<\/span><\/strong><span>\u00a0ao\u00a0<strong>atrito<\/strong>\u00a0:<\/span><\/p>\n<ul>\n<li><span>o primeiro \u00e9 moldar o corpo em movimento para que o fluxo laminar seja poss\u00edvel<\/span><\/li>\n<li><span>o segundo m\u00e9todo \u00e9 aumentar o comprimento e diminuir a se\u00e7\u00e3o transversal do objeto em movimento, tanto quanto poss\u00edvel.<\/span><\/li>\n<\/ul>\n<p><span>O\u00a0<\/span><strong><span>coeficiente de atrito da pele<\/span><\/strong><span>\u00a0,\u00a0<\/span><strong><span>C\u00a0<\/span><sub><span>D, atrito<\/span><\/sub><\/strong><span>\u00a0, \u00e9 definido por<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-equation-drag-coefficient.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20489 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-equation-drag-coefficient.png\" alt=\"atrito da pele - equa\u00e7\u00e3o - coeficiente de arrasto\" width=\"217\" height=\"126\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/skin-friction-equation-drag-coefficient.png\" \/><\/a><\/p>\n<p><span>Deve-se notar que o\u00a0<\/span><strong><span>coeficiente de atrito<\/span><\/strong><span>\u00a0da\u00a0<strong>pele<\/strong>\u00a0\u00e9 igual ao\u00a0<\/span><strong><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\/\"><span>fator de atrito de Fanning<\/span><\/a><\/strong><span>\u00a0.\u00a0O fator de atrito de Fanning, nomeado ap\u00f3s John Thomas Fanning, \u00e9 um n\u00famero sem dimens\u00e3o, que \u00e9 um quarto do\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.\u00a0Como pode ser visto, existe uma conex\u00e3o entre\u00a0<\/span><strong><span>as for\u00e7as de atrito da pele<\/span><\/strong><span>\u00a0e\u00a0<\/span><a title=\"Perda de Cabe\u00e7a Maior - Perda de Fric\u00e7\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/\"><strong><span>as perdas na cabe\u00e7a de atrito<\/span><\/strong><\/a><span>\u00a0.<\/span><\/p>\n<p><span>Veja tamb\u00e9m:\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><\/p>\n<p><span>Para\u00a0<\/span><a title=\"Fluxo Laminar - Fluxo Viscoso\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-laminar-fluxo-viscoso-definicao\/\"><span>o fluxo laminar<\/span><\/a><span>\u00a0em um tubo, o\u00a0<\/span><strong><span>fator de atrito de Fanning<\/span><\/strong><span>\u00a0(coeficiente de atrito da pele) \u00e9 uma consequ\u00eancia da\u00a0<\/span><strong><span>lei<\/span><\/strong><span>\u00a0de\u00a0<strong>Poiseuille<\/strong>\u00a0que \u00e9 dada pelas seguintes equa\u00e7\u00f5es:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-laminar-flow.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20490 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-laminar-flow.png\" alt=\"coeficiente de arrasto - fluxo laminar\" width=\"312\" height=\"195\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-laminar-flow.png\" \/><\/a><\/p>\n<p><span>Em\u00a0<\/span><a title=\"Fluxo turbulento\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-fluxo-turbulento-definicao\/\"><span>fluxos turbulentos<\/span><\/a><span>\u00a0, no entanto, as coisas s\u00e3o mais dif\u00edceis, pois o fator de atrito depende fortemente da\u00a0<\/span><a title=\"Rugosidade relativa do tubo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/relative-roughness-of-pipe\/\"><span>rugosidade<\/span><\/a><span>\u00a0do\u00a0<a title=\"Rugosidade relativa do tubo\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/major-head-loss-friction-loss\/relative-roughness-of-pipe\/\">tubo<\/a>\u00a0.\u00a0O\u00a0<\/span><a href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-fator-de-atrito-de-darcy-definicao\/\"><strong><span>fator de atrito<\/span><\/strong><\/a><span>\u00a0para o fluxo de fluido pode ser determinado usando um\u00a0<\/span><a 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.\u00a0Por exemplo:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-turbulent-flow.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20491 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-turbulent-flow.png\" alt=\"coeficiente de arrasto - fluxo turbulento\" width=\"357\" height=\"189\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-coefficient-turbulent-flow.png\" \/><\/a><\/p>\n<p><span>O componente de atrito da\u00a0<\/span><strong><span>for\u00e7a de arrasto<\/span><\/strong><span>\u00a0\u00e9 dado por:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-skin-friction.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20492 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-skin-friction.png\" alt=\"for\u00e7a de arrasto - fric\u00e7\u00e3o da pele\" width=\"345\" height=\"79\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/drag-force-skin-friction.png\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<h2><span>Arrastar formul\u00e1rio &#8211; Arrastar press\u00e3o<\/span><\/h2>\n<p><strong><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/form-drag-pressure-drag-schema.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-20493 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/form-drag-pressure-drag-schema-300x288.png\" alt=\"arrasto de forma - arrasto de press\u00e3o\" width=\"300\" height=\"288\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/form-drag-pressure-drag-schema-300x288.png\" \/><\/a><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.\u00a0Esse tipo de for\u00e7a de arrasto tamb\u00e9m \u00e9 uma conseq\u00fc\u00eancia interessante\u00a0<\/span><strong><a title=\"Equa\u00e7\u00e3o de Bernoulli - Princ\u00edpio de Bernoulli\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-a-equacao-de-bernoulli-principio-de-bernoulli-definicao\/\"><span>do efeito de Bernoulli<\/span><\/a><span>\u00a0.\u00a0<\/span><\/strong><span>De acordo com o princ\u00edpio de Bernoulli, o ar em movimento mais r\u00e1pido exerce menos\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\/\"><span>press\u00e3o<\/span><\/a><span>\u00a0.\u00a0Isso faz com que haja uma\u00a0<\/span><strong><span>diferen\u00e7a de press\u00e3o<\/span><\/strong><span>\u00a0entre as superf\u00edcies do objeto.\u00a0O tamanho e a forma geral do corpo s\u00e3o os fatores mais importantes no\u00a0<\/span><strong><span>arrasto do formul\u00e1rio<\/span><\/strong><span>.\u00a0Em geral, os corpos com uma se\u00e7\u00e3o transversal geom\u00e9trica maior apresentada ter\u00e3o um arrasto maior que os corpos mais finos.<\/span><\/p>\n<p><span>Como pode ser visto na figura, a for\u00e7a de arrasto surge da diferen\u00e7a entre as press\u00f5es que atuam na frente e atr\u00e1s do corpo imerso.\u00a0Para esta for\u00e7a pode ser calculada (para este caso) simplesmente usando a defini\u00e7\u00e3o de press\u00e3o como:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/form-drag-drag-force.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20494 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/form-drag-drag-force.png\" alt=\"arrasto de forma - for\u00e7a de arrasto\" width=\"199\" height=\"60\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/form-drag-drag-force.png\" \/><\/a><\/p>\n<p><span>Como a\u00a0<\/span><strong><a title=\"Perda de Cabe\u00e7a - Perda de Press\u00e3o\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/bernoullis-equation-bernoullis-principle\/head-loss\/\"><span>perda de<\/span><\/a><span>\u00a0carga \u00e9 aproximadamente proporcional ao quadrado da taxa de fluxo<\/span><\/strong><span>\u00a0na maioria dos fluxos de engenharia, o\u00a0<\/span><strong><span>coeficiente de arrasto total<\/span><\/strong><span>\u00a0pode ser determinado simplesmente adicionando os coeficientes de atrito e press\u00e3o de arrasto:<\/span><\/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>&#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>O termo arrasto parasit\u00e1rio \u00e9 usado principalmente na aerodin\u00e2mica, uma vez que, para elevar as asas, \u00e9 geralmente pequeno em compara\u00e7\u00e3o com o levantamento. O arrasto parasit\u00e1rio \u00e9 uma combina\u00e7\u00e3o de arrasto de forma, arrasto de atrito da pele e arrasto de interfer\u00eancia. Engenharia T\u00e9rmica O que \u00e9 Parasitic Drag O termo\u00a0arrasto parasit\u00e1rio\u00a0\u00e9 usado principalmente &#8230; <a title=\"O que \u00e9 Parasitic Drag &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-parasitic-drag-definicao\/\" aria-label=\"More on O que \u00e9 Parasitic Drag &#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 Parasitic Drag - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O termo arrasto parasit\u00e1rio \u00e9 usado principalmente na aerodin\u00e2mica, uma vez que, para elevar as asas, \u00e9 geralmente pequeno em compara\u00e7\u00e3o com eleva\u00e7\u00e3o. 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