{"id":47551,"date":"2019-11-05T09:49:50","date_gmt":"2019-11-05T08:49:50","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-o-numero-sherwood-definicao\/"},"modified":"2020-01-23T20:10:25","modified_gmt":"2020-01-23T19:10:25","slug":"o-que-e-o-numero-sherwood-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-numero-sherwood-definicao\/","title":{"rendered":"O que \u00e9 o n\u00famero Sherwood &#8211; Defini\u00e7\u00e3o"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">O n\u00famero Sherwood \u00e9 um n\u00famero sem dimens\u00e3o, com o nome de Thomas Kilgore Sherwood.\u00a0O n\u00famero de Sherwood \u00e9 definido como a raz\u00e3o da transfer\u00eancia de massa convectiva para a difusividade de massa.\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>O que \u00e9 o n\u00famero Sherwood<\/h2>\n<p>O\u00a0<strong>n\u00famero Sherwood<\/strong>\u00a0\u00e9 um n\u00famero sem dimens\u00e3o, com o nome de Thomas Kilgore Sherwood.\u00a0O\u00a0<strong>n\u00famero de Sherwood<\/strong>\u00a0\u00e9 definido como a raz\u00e3o da transfer\u00eancia de massa convectiva para a difusividade de massa.<\/p>\n<p>Os n\u00fameros de Nusselt e Sherwood representam a efic\u00e1cia da convec\u00e7\u00e3o de calor e massa na superf\u00edcie.\u00a0O\u00a0<strong>n\u00famero de Sherwood<\/strong>\u00a0\u00e9 para a camada limite de concentra\u00e7\u00e3o o que o n\u00famero de Nusselt \u00e9 para a camada limite t\u00e9rmica.<\/p>\n<p>O n\u00famero Sherwood \u00e9 definido como:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/sherwood-number-definition-formula.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-20327 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/sherwood-number-definition-formula.png\" alt=\"n\u00famero sherwood - defini\u00e7\u00e3o - f\u00f3rmula\" width=\"419\" height=\"313\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/sherwood-number-definition-formula.png\" \/><\/a><\/p>\n<p>Onde:<\/p>\n<p>k\u00a0<sub>m<\/sub>\u00a0\u00e9 o coeficiente de transfer\u00eancia de massa por convec\u00e7\u00e3o [m \/ s]\n<p>L \u00e9 um comprimento caracter\u00edstico [m]\n<p>D \u00e9 a difusividade da massa [m\u00a0<sup>2<\/sup>\u00a0\/ s]\n<p>Por exemplo, o n\u00famero Sherwood para uma \u00fanica esfera pode ser expresso como:<\/p>\n<p>Sh = Sh\u00a0<sub>0<\/sub>\u00a0+ C.Re\u00a0<sup>m<\/sup>\u00a0Sc\u00a0<sup>1\/3<\/sup><\/p>\n<p>onde Sh\u00a0<sub>0<\/sub>\u00a0\u00e9 o n\u00famero de Sherwood devido apenas \u00e0 convec\u00e7\u00e3o natural e n\u00e3o \u00e0 convec\u00e7\u00e3o for\u00e7ada.<\/p>\n<p>A difusividade \u00e9 encontrada na lei de Fick, que declara:<\/p>\n<p><em><span>Se a concentra\u00e7\u00e3o de um soluto em uma regi\u00e3o for maior que em outra solu\u00e7\u00e3o, o soluto difunde da regi\u00e3o de maior concentra\u00e7\u00e3o para a regi\u00e3o de menor concentra\u00e7\u00e3o, com uma magnitude proporcional ao gradiente de concentra\u00e7\u00e3o.<\/span><\/em><\/p>\n<p><span>Em uma dimens\u00e3o (espacial), a lei \u00e9:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Ficks-Law-equation.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-15177 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Ficks-Law-equation.png\" alt=\"Lei de Ficks - equa\u00e7\u00e3o\" width=\"133\" height=\"66\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Ficks-Law-equation.png\" \/><\/a><\/p>\n<p><span>Onde:<\/span><\/p>\n<ul>\n<li><em><span>J<\/span><\/em><span>\u00a0\u00e9 o fluxo de difus\u00e3o,<\/span><\/li>\n<li><em><span>D<\/span><\/em><span>\u00a0\u00e9 o\u00a0<\/span><strong><span>coeficiente de difus\u00e3o,<\/span><\/strong><\/li>\n<li><em><span>\u03c6<\/span><\/em><span>\u00a0(para misturas ideais) \u00e9 a concentra\u00e7\u00e3o.<\/span><\/li>\n<\/ul>\n<p><span>O uso desta lei na\u00a0<\/span><strong><span>teoria de reatores nucleares<\/span><\/strong><span>\u00a0leva \u00e0\u00a0<\/span><a title=\"Teoria da difus\u00e3o de n\u00eautrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/neutron-diffusion-theory\/\"><strong><span>aproxima\u00e7\u00e3o de difus\u00e3o<\/span><\/strong><\/a><span>\u00a0.<\/span><\/p>\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","protected":false},"excerpt":{"rendered":"<p>O n\u00famero Sherwood \u00e9 um n\u00famero sem dimens\u00e3o, com o nome de Thomas Kilgore Sherwood.\u00a0O n\u00famero de Sherwood \u00e9 definido como a raz\u00e3o da transfer\u00eancia de massa convectiva para a difusividade de massa.\u00a0Engenharia T\u00e9rmica O que \u00e9 o n\u00famero Sherwood O\u00a0n\u00famero Sherwood\u00a0\u00e9 um n\u00famero sem dimens\u00e3o, com o nome de Thomas Kilgore Sherwood.\u00a0O\u00a0n\u00famero de Sherwood\u00a0\u00e9 &#8230; <a title=\"O que \u00e9 o n\u00famero Sherwood &#8211; Defini\u00e7\u00e3o\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-o-numero-sherwood-definicao\/\" aria-label=\"More on O que \u00e9 o n\u00famero Sherwood &#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 o n\u00famero Sherwood - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"O n\u00famero Sherwood \u00e9 um n\u00famero sem dimens\u00e3o, com o nome de Thomas Kilgore Sherwood. 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