{"id":46704,"date":"2019-11-01T00:04:49","date_gmt":"2019-10-31T23:04:49","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quelle-est-la-longueur-dentree-hydrodynamique-definition\/"},"modified":"2020-03-02T20:36:34","modified_gmt":"2020-03-02T19:36:34","slug":"quelle-est-la-longueur-dentree-hydrodynamique-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quelle-est-la-longueur-dentree-hydrodynamique-definition\/","title":{"rendered":"Quelle est la longueur d&#8217;entr\u00e9e hydrodynamique &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">Pour caract\u00e9riser la r\u00e9gion d&#8217;entr\u00e9e, il faut introduire la longueur hydrodynamique.\u00a0La longueur d&#8217;entr\u00e9e hydrodynamique doit \u00eatre v\u00e9rifi\u00e9e dans tous les calculs.\u00a0G\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>Longueur d&#8217;entr\u00e9e hydrodynamique<\/h2>\n<figure id=\"attachment_14394\" class=\"wp-caption alignright\" aria-describedby=\"caption-attachment-14394\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Internal-Flow.png\"><img loading=\"lazy\" class=\"size-medium wp-image-14394 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Internal-Flow-300x269.png\" alt=\"Flux interne\" width=\"300\" height=\"269\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Internal-Flow-300x269.png\" \/><\/a><figcaption id=\"caption-attachment-14394\" class=\"wp-caption-text\">Source: White Frank M., M\u00e9canique des fluides, McGraw-Hill Education, 7e \u00e9dition, f\u00e9vrier 2010, ISBN: 978-0077422417.<\/figcaption><\/figure>\n<p>Pour\u00a0<a title=\"Flux interne\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/internal-flow\/\">le<\/a>\u00a0r\u00e9gime d&#8217;\u00a0<a title=\"Internal Flow\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/internal-flow\/\">\u00e9coulement interne<\/a>\u00a0, une\u00a0<strong>r\u00e9gion d&#8217;entr\u00e9e<\/strong>\u00a0est typique.\u00a0Dans cette r\u00e9gion, un flux presque invisible en amont converge et p\u00e9n\u00e8tre dans le tube.\u00a0Pour caract\u00e9riser cette r\u00e9gion, la\u00a0<strong>longueur d\u2019entr\u00e9e hydrodynamique<\/strong>\u00a0est introduite et est approximativement \u00e9gale \u00e0:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/hydrodynamic-entrance-length.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14416 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/hydrodynamic-entrance-length.png\" alt=\"longueur d'entr\u00e9e hydrodynamique\" width=\"365\" height=\"69\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/hydrodynamic-entrance-length.png\" \/><\/a><\/p>\n<p>La longueur hydrodynamique maximale \u00e0 l&#8217;entr\u00e9e, en\u00a0<strong>Re\u00a0<sub>D, crit<\/sub>\u00a0\u00a0= 2300<\/strong>\u00a0(\u00a0<strong>flux laminaire<\/strong>\u00a0), est L\u00a0<sub>e<\/sub>\u00a0= 138d, o\u00f9 D est le diam\u00e8tre du tuyau.\u00a0C&#8217;est la plus longue longueur de d\u00e9veloppement possible.\u00a0Dans un\u00a0<strong>\u00e9coulement turbulent<\/strong>\u00a0, les couches limites se\u00a0d\u00e9veloppent plus rapidement, et L\u00a0<sub>e<\/sub>\u00a0\u00a0est relativement courte.\u00a0Pour tout probl\u00e8me donn\u00e9,\u00a0<strong>L\u00a0<sub>e<\/sub>\u00a0\u00a0\/ D<\/strong>\u00a0doit \u00eatre\u00a0<strong>v\u00e9rifi\u00e9<\/strong>\u00a0pour voir si L\u00a0<sub>e<\/sub>\u00a0\u00a0est n\u00e9gligeable par rapport \u00e0 la longueur de la conduite.\u00a0\u00c0 une distance finie de l&#8217;entr\u00e9e, les effets d&#8217;entr\u00e9e peuvent \u00eatre n\u00e9glig\u00e9s, car les couches limites se confondent et le noyau non invisible dispara\u00eet.\u00a0Le flux de tube est alors\u00a0<strong>compl\u00e8tement d\u00e9velopp\u00e9<\/strong>\u00a0.<\/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-accordion\">\n<div class=\"su-spoiler su-spoiler-style-default su-spoiler-icon-arrow\" data-anchor=\"References\">\n<div class=\"su-spoiler-content su-clearfix\">\n<p>&nbsp;<\/p>\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<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Pour caract\u00e9riser la r\u00e9gion d&#8217;entr\u00e9e, il faut introduire la longueur hydrodynamique.\u00a0La longueur d&#8217;entr\u00e9e hydrodynamique doit \u00eatre v\u00e9rifi\u00e9e dans tous les calculs.\u00a0G\u00e9nie thermique Longueur d&#8217;entr\u00e9e hydrodynamique Source: White Frank M., M\u00e9canique des fluides, McGraw-Hill Education, 7e \u00e9dition, f\u00e9vrier 2010, ISBN: 978-0077422417. Pour\u00a0le\u00a0r\u00e9gime d&#8217;\u00a0\u00e9coulement interne\u00a0, une\u00a0r\u00e9gion d&#8217;entr\u00e9e\u00a0est typique.\u00a0Dans cette r\u00e9gion, un flux presque invisible en amont converge &#8230; <a title=\"Quelle est la longueur d&#8217;entr\u00e9e hydrodynamique &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quelle-est-la-longueur-dentree-hydrodynamique-definition\/\" aria-label=\"En savoir plus sur Quelle est la longueur d&#8217;entr\u00e9e hydrodynamique &#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>Quelle est la longueur d&#039;entr\u00e9e hydrodynamique - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Pour caract\u00e9riser la r\u00e9gion d&#039;entr\u00e9e, il faut introduire la longueur hydrodynamique. 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