{"id":43984,"date":"2019-10-14T08:16:04","date_gmt":"2019-10-14T07:16:04","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quel-est-le-numero-de-sherwood-definition\/"},"modified":"2021-05-28T20:31:35","modified_gmt":"2021-05-28T19:31:35","slug":"quel-est-le-numero-de-sherwood-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quel-est-le-numero-de-sherwood-definition\/","title":{"rendered":"Quel est le nombre de Sherwood &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Le nombre de Sherwood est un nombre sans dimension, nomm\u00e9 d&#8217;apr\u00e8s Thomas Kilgore Sherwood. Le nombre de Sherwood est d\u00e9fini comme le rapport entre le transfert de masse par convection et la diffusivit\u00e9 de masse. G\u00e9nie thermique<\/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>Quel est le nombre de Sherwood<\/h2>\n<p>Le nombre de Sherwood\u00a0est un nombre sans dimension, nomm\u00e9 d&#8217;apr\u00e8s Thomas Kilgore Sherwood.\u00a0Le\u00a0<strong>nombre de Sherwood<\/strong>\u00a0est d\u00e9fini comme le rapport entre le transfert de masse par convection et la diffusivit\u00e9 de masse.<\/p>\n<p>Les nombres de Nusselt et de Sherwood repr\u00e9sentent l&#8217;efficacit\u00e9 de la convection de chaleur et de masse \u00e0 la surface.\u00a0Le\u00a0<strong>nombre de Sherwood<\/strong>\u00a0est \u00e0 la couche limite de concentration ce que le nombre de Nusselt est \u00e0 la couche limite thermique.<\/p>\n<p>Le num\u00e9ro Sherwood est d\u00e9fini comme suit:<\/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=\"sherwood number - D\u00e9finition - formule\" 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>o\u00f9:<\/p>\n<p>k\u00a0<sub>m<\/sub>\u00a0est le coefficient de transfert de masse par convection [m \/ s]\n<p>L est une longueur caract\u00e9ristique [m]\n<p>D est la diffusivit\u00e9 de masse [m\u00a0<sup>2<\/sup>\u00a0\/ s]\n<p>Par exemple, le nombre de Sherwood pour une seule sph\u00e8re peut \u00eatre exprim\u00e9 par:<\/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>o\u00f9 Sh\u00a0<sub>0<\/sub>\u00a0est le nombre de Sherwood d\u00fb uniquement \u00e0 la convection naturelle et non \u00e0 la convection forc\u00e9e.<\/p>\n<p>La loi de Fick \u00e9nonce la diffusivit\u00e9:<\/p>\n<p><em>Si la concentration d&#8217;un solut\u00e9 dans une r\u00e9gion est sup\u00e9rieure \u00e0 celle d&#8217;une autre solution, le solut\u00e9 diffuse de la r\u00e9gion \u00e0 concentration sup\u00e9rieure \u00e0 la r\u00e9gion de concentration inf\u00e9rieure, avec une magnitude proportionnelle au gradient de concentration.<\/em><\/p>\n<p>Dans une dimension (spatiale), la loi est:<\/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=\"Loi Ficks - \u00e9quation\" 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>o\u00f9:<\/p>\n<ul>\n<li><em>J<\/em>\u00a0est le flux de diffusion,<\/li>\n<li><em>D<\/em>\u00a0est le\u00a0<strong>coefficient de diffusion,<\/strong><\/li>\n<li><em>\u03c6<\/em>\u00a0(pour les m\u00e9langes id\u00e9aux) est la concentration.<\/li>\n<\/ul>\n<p>L&#8217;utilisation de cette loi dans\u00a0<strong>la th\u00e9orie des r\u00e9acteurs nucl\u00e9aires<\/strong>\u00a0conduit \u00e0 l&#8217;\u00a0<a title=\"Th\u00e9orie de la diffusion des neutrons\" href=\"https:\/\/www.nuclear-power.com\/nuclear-power\/reactor-physics\/neutron-diffusion-theory\/\"><strong>approximation de diffusion<\/strong><\/a>\u00a0.<\/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>Cet article est bas\u00e9 sur la traduction automatique de l&#8217;article original en anglais. Pour plus d&#8217;informations, voir l&#8217;article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l&#8217;adresse: translations@nuclear-power.com ou remplissez le formulaire de traduction en ligne. Nous appr\u00e9cions votre aide, nous mettrons \u00e0 jour la traduction le plus rapidement possible. Merci<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Le nombre de Sherwood est un nombre sans dimension, nomm\u00e9 d&#8217;apr\u00e8s Thomas Kilgore Sherwood. Le nombre de Sherwood est d\u00e9fini comme le rapport entre le transfert de masse par convection et la diffusivit\u00e9 de masse. G\u00e9nie thermique Quel est le nombre de Sherwood Le nombre de Sherwood\u00a0est un nombre sans dimension, nomm\u00e9 d&#8217;apr\u00e8s Thomas Kilgore &#8230; <a title=\"Quel est le nombre de Sherwood &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quel-est-le-numero-de-sherwood-definition\/\" aria-label=\"En savoir plus sur Quel est le nombre de Sherwood &#8211; D\u00e9finition\">Lire la suite<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[8],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Quel est le nombre de Sherwood - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Le nombre de Sherwood est un nombre sans dimension, nomm\u00e9 d&#039;apr\u00e8s Thomas Kilgore Sherwood. 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