{"id":46692,"date":"2019-10-31T23:08:33","date_gmt":"2019-10-31T22:08:33","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-la-fraction-vide-flux-diphasique-definition\/"},"modified":"2020-03-02T20:34:39","modified_gmt":"2020-03-02T19:34:39","slug":"quest-ce-que-la-fraction-vide-flux-diphasique-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-fraction-vide-flux-diphasique-definition\/","title":{"rendered":"Qu&#8217;est-ce que la fraction vide &#8211; Flux diphasique &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">La fraction de vide, \u03b1, est l&#8217;un des param\u00e8tres les plus importants utilis\u00e9s pour caract\u00e9riser le flux de fluide diphasique, en particulier le flux gaz-liquide.\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>Param\u00e8tres de base du d\u00e9bit de fluide \u00e0 deux phases<\/h2>\n<p>Dans cette section, nous examinerons l\u2019\u00e9coulement simultan\u00e9 de\u00a0<strong>gaz (ou de vapeur) et d\u2019eau liquide<\/strong>\u00a0(comme dans\u00a0<a title=\"G\u00e9n\u00e9rateur de vapeur\" href=\"https:\/\/www.nuclear-power.com\/steam-generator\/\">les g\u00e9n\u00e9rateurs de vapeur<\/a>\u00a0et les condenseurs) dans un \u00e9coulement simultan\u00e9 \u00e0 travers un conduit de section A. Les indices\u00a0<strong>\u00abv\u00bb<\/strong>\u00a0et\u00a0<strong>\u00ab\u00bb<\/strong>\u00a0indiquent la\u00a0<strong>phase vapeur<\/strong>\u00a0et\u00a0<strong>la<\/strong>\u00a0phase\u00a0<strong>liquide<\/strong>\u00a0, respectivement.\u00a0Les param\u00e8tres fondamentaux qui caract\u00e9risent ce flux sont:<\/p>\n<ul>\n<li><a title=\"Fraction vide - \u00e9coulement diphasique\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/void-fraction-two-phase-flow\/\"><strong>Fraction vide<\/strong><\/a><\/li>\n<li><a title=\"Qualit\u00e9 statique - Qualit\u00e9 du d\u00e9bit\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/static-quality-flow-quality\/\"><strong>Qualit\u00e9 statique<\/strong><\/a><\/li>\n<li><a title=\"Qualit\u00e9 statique - Qualit\u00e9 du d\u00e9bit\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/static-quality-flow-quality\/\"><strong>Qualit\u00e9 du d\u00e9bit<\/strong><\/a><\/li>\n<li><a title=\"Densit\u00e9 de m\u00e9lange - D\u00e9bit diphasique\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/mixture-density-two-phase-flow\/\"><strong>Densit\u00e9 du m\u00e9lange<\/strong><\/a><\/li>\n<li><a title=\"Slip Ratio - V\u00e9locit\u00e9\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/slip-ratio-velocity-ratio\/\"><strong>Slip Ratio &#8211; V\u00e9locit\u00e9<\/strong><\/a><\/li>\n<li><a title=\"Vitesse superficielle - \u00e9coulement diphasique\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/superficial-velocity-two-phase-flow\/\"><strong>Vitesse superficielle<\/strong><\/a><\/li>\n<\/ul>\n<div class=\"su-spacer\"><\/div>\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>Fraction vide<\/h2>\n<p><strong><span>La fraction de vide, \u03b1<\/span><\/strong><span>\u00a0, est l&#8217;un des param\u00e8tres les plus importants utilis\u00e9s pour caract\u00e9riser l&#8217;\u00e9coulement de fluide diphasique, en particulier l&#8217;\u00e9coulement gaz-liquide.<\/span><br \/>\n<span>Diverses d\u00e9finitions g\u00e9om\u00e9triques sont utilis\u00e9es pour sp\u00e9cifier ce param\u00e8tre.\u00a0La fraction de vide dans un \u00e9coulement de fluide diphasique peut \u00eatre d\u00e9finie comme:<\/span><\/p>\n<ol>\n<li><span>Fraction du\u00a0<\/span><strong><span>volume<\/span><\/strong><span>\u00a0du\u00a0<strong>canal<\/strong>\u00a0occup\u00e9e par la phase gazeuse.\u00a0Cette fraction de vide est connue sous le nom de\u00a0<\/span><strong><span>fraction de vide volum\u00e9trique.<\/span><\/strong><\/li>\n<li><span>Fraction de la\u00a0<\/span><strong><span>section transversale<\/span><\/strong><span>\u00a0du\u00a0<strong>canal<\/strong>\u00a0occup\u00e9e par la phase gazeuse.\u00a0Cette fraction de vide est connue sous le nom de\u00a0<\/span><strong><span>fraction de vide en coupe<\/span><\/strong><span>\u00a0.<\/span><\/li>\n<li><span>La\u00a0<\/span><strong><span>fraction de vide locale se<\/span><\/strong><span>\u00a0r\u00e9f\u00e8re \u00e0 celle d&#8217;un seul point ou d&#8217;un tr\u00e8s petit volume.\u00a0Il prend donc les valeurs de 1 ou 0.<\/span><\/li>\n<\/ol>\n<p><span>\u00c0 d&#8217;autres fins, nous supposerons qu&#8217;une fraction de vide est la fraction de la\u00a0<\/span><strong><span>section transversale<\/span><\/strong><span>\u00a0du\u00a0<strong>canal<\/strong>\u00a0qui est occup\u00e9e par la phase gazeuse (c&#8217;est-\u00e0-dire la fraction de vide transversale) d\u00e9finie comme:<\/span><br \/>\n<a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/void-fraction-definition.png\"><img loading=\"lazy\" class=\"size-full wp-image-14771 aligncenter lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/void-fraction-definition.png\" alt=\"d\u00e9finition de la fraction vide\" width=\"184\" height=\"98\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/void-fraction-definition.png\" \/><\/a><br \/>\n<span>La fraction de vide est importante pour l&#8217;\u00e9coulement diphasique, car elle influence les param\u00e8tres physiques cl\u00e9s, tels que la\u00a0<\/span><strong><span>viscosit\u00e9<\/span><\/strong><span>\u00a0,\u00a0<\/span><strong><span>la chute de pression<\/span><\/strong><span>\u00a0et\u00a0<\/span><strong><span>le transfert de chaleur<\/span><\/strong><span>\u00a0.<\/span><\/p>\n<p><span>Les relations entre\u00a0<\/span><strong><span>x, \u03b1 et S<\/span><\/strong><span>\u00a0peuvent \u00eatre d\u00e9duites et le r\u00e9sultat est:<\/span><\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relations-between-quality-void-fraction-and-slip.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14782 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relations-between-quality-void-fraction-and-slip.png\" alt=\"relations entre qualit\u00e9, fraction de vide et glissement\" width=\"619\" height=\"101\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/relations-between-quality-void-fraction-and-slip.png\" \/><\/a><\/p>\n<figure id=\"attachment_14781\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-14781\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Chart-Slip-Ratio.png\"><img loading=\"lazy\" class=\"size-full wp-image-14781 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Chart-Slip-Ratio.png\" alt=\"Effet de S sur \u03b1 vs x pour l'eau \u00e0 7 MPa.  Source: Buongiorno Jacopo, D\u00e9partement des sciences et de l'ing\u00e9nierie nucl\u00e9aires du MIT, NOTES SUR LE FLUX EN DEUX PHASES\" width=\"601\" height=\"483\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Chart-Slip-Ratio.png\" \/><\/a><figcaption id=\"caption-attachment-14781\" class=\"wp-caption-text\"><span>Effet de S sur \u03b1 vs x pour l&#8217;eau \u00e0 7 MPa.\u00a0Source: Buongiorno Jacopo, D\u00e9partement des sciences et de l&#8217;ing\u00e9nierie nucl\u00e9aires du MIT, NOTES SUR LE FLUX EN DEUX PHASES<\/p>\n<p><\/span><\/figcaption><\/figure>\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","protected":false},"excerpt":{"rendered":"<p>La fraction de vide, \u03b1, est l&#8217;un des param\u00e8tres les plus importants utilis\u00e9s pour caract\u00e9riser le flux de fluide diphasique, en particulier le flux gaz-liquide.\u00a0G\u00e9nie thermique Param\u00e8tres de base du d\u00e9bit de fluide \u00e0 deux phases Dans cette section, nous examinerons l\u2019\u00e9coulement simultan\u00e9 de\u00a0gaz (ou de vapeur) et d\u2019eau liquide\u00a0(comme dans\u00a0les g\u00e9n\u00e9rateurs de vapeur\u00a0et les &#8230; <a title=\"Qu&#8217;est-ce que la fraction vide &#8211; Flux diphasique &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-fraction-vide-flux-diphasique-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que la fraction vide &#8211; Flux diphasique &#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>Qu&#039;est-ce que la fraction vide - Flux diphasique - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"La fraction de vide, \u03b1, est l&#039;un des param\u00e8tres les plus importants utilis\u00e9s pour caract\u00e9riser le flux de fluide diphasique, en particulier le flux gaz-liquide. 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