{"id":46566,"date":"2019-10-22T17:04:02","date_gmt":"2019-10-22T16:04:02","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-la-vitesse-superficielle-debit-diphasique-definition\/"},"modified":"2020-03-02T12:30:43","modified_gmt":"2020-03-02T11:30:43","slug":"quest-ce-que-la-vitesse-superficielle-debit-diphasique-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-vitesse-superficielle-debit-diphasique-definition\/","title":{"rendered":"Qu&#8217;est-ce que la vitesse superficielle &#8211; D\u00e9bit diphasique &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">La vitesse superficielle est une vitesse d&#8217;\u00e9coulement hypoth\u00e9tique calcul\u00e9e comme si la phase ou le fluide donn\u00e9 \u00e9tait le seul \u00e0 s&#8217;\u00e9couler ou \u00e0 \u00eatre pr\u00e9sent dans une section donn\u00e9e.\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>Vitesse superficielle<\/h2>\n<p><strong>La vitesse superficielle<\/strong>\u00a0est une vitesse d&#8217;\u00e9coulement hypoth\u00e9tique calcul\u00e9e comme si la phase ou le fluide donn\u00e9 \u00e9tait le\u00a0<strong>seul \u00e0 s&#8217;\u00e9couler<\/strong>\u00a0ou \u00e0 \u00eatre pr\u00e9sent dans une section donn\u00e9e.\u00a0La vitesse de la phase donn\u00e9e est calcul\u00e9e comme si la deuxi\u00e8me phase \u00e9tait ignor\u00e9e.<\/p>\n<p>Dans l&#8217;\u00a0ing\u00e9nierie des \u00e9coulements polyphasiques et les\u00a0flux dans les\u00a0milieux poreux, la\u00a0<strong>vitesse superficielle (V\u00a0<sub>phase<\/sub>\u00a0ou j de\u00a0<sub>phase<\/sub>\u00a0)<\/strong>\u00a0est couramment utilis\u00e9e, car elle est la valeur qui est non ambigu, tandis que la\u00a0vitesse r\u00e9elle est souvent d\u00e9pendante dans l&#8217;\u00a0espace et l&#8217;\u00a0objet de nombreuses hypoth\u00e8ses.<\/p>\n<p><span>La vitesse superficielle peut s&#8217;exprimer comme suit:<\/span><br \/>\n<a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/superficial-velocity-definition.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14783 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/superficial-velocity-definition.png\" alt=\"vitesse superficielle - d\u00e9finition\" width=\"332\" height=\"196\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/superficial-velocity-definition.png\" \/><\/a><\/p>\n<p><span>Pour une meilleure compr\u00e9hension, consid\u00e9rons un tuyau ayant une\u00a0section transversale de\u00a00,1 m\u00a0<\/span><sup><span>2 de<\/span><\/sup><span>\u00a0surface d&#8217;\u00e9coulement.\u00a0Supposons que le d\u00e9bit est de 1 m\u00a0<\/span><sup><span>3<\/span><\/sup><span>\u00a0\/ s.\u00a0Pour\u00a0<\/span><strong><span>un \u00e9coulement de fluide monophas\u00e9,<\/span><\/strong><span>\u00a0la\u00a0<\/span><strong><span>vitesse superficielle sera \u00e9gale \u00e0 la\u00a0<\/span><\/strong><strong><span>vitesse\u00a0<\/span><\/strong><span><strong>r\u00e9elle du fluide<\/strong>\u00a0et sera de 10 m \/ s.<\/span><br \/>\n<span>Pour\u00a0<\/span><strong><span>un \u00e9coulement de fluide \u00e0 deux phases<\/span><\/strong><span>\u00a0(par exemple un \u00e9coulement vapeur-liquide), la situation sera diff\u00e9rente.\u00a0En supposant que le rapport de glissement est l&#8217;unit\u00e9, les deux phases prises s\u00e9par\u00e9ment, auront des vitesses superficielles de\u00a0<\/span><strong><span>5 m \/ s<\/span><\/strong><span>\u00a0.\u00a0La vitesse r\u00e9elle r\u00e9sultante sera alors \u00e9gale \u00e0\u00a0<\/span><strong><span>10 m \/ s<\/span><\/strong><span>\u00a0.\u00a0Si les deux phases auront des vitesses diff\u00e9rentes (avec glissement), la situation sera plus compliqu\u00e9e.<\/span><\/p>\n<figure id=\"attachment_14789\" class=\"wp-caption aligncenter\" aria-describedby=\"caption-attachment-14789\"><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-patterns-horizontal-flow.png\"><img loading=\"lazy\" class=\"wp-image-14789 size-full lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-patterns-horizontal-flow.png\" alt=\"sch\u00e9mas d'\u00e9coulement - \u00e9coulement horizontal\" width=\"436\" height=\"416\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-patterns-horizontal-flow.png\" \/><\/a><figcaption id=\"caption-attachment-14789\" class=\"wp-caption-text\"><span>Une carte de r\u00e9gime d&#8217;\u00e9coulement pour l&#8217;\u00e9coulement d&#8217;un m\u00e9lange air \/ eau dans un tuyau horizontal de 2,5 cm de diam\u00e8tre \u00e0 25 \u00b0 C et 1 bar.\u00a0Les lignes et les points pleins sont des observations exp\u00e9rimentales des conditions de transition tandis que les zones hachur\u00e9es repr\u00e9sentent des pr\u00e9dictions th\u00e9oriques.\u00a0Source: Mandhane, JM, Gregory, GA et Aziz, KA (1974).\u00a0Une carte de configuration d&#8217;\u00e9coulement pour l&#8217;\u00e9coulement gaz-liquide dans des tuyaux horizontaux.\u00a0Int.\u00a0\u00c9coulement multiphasique<\/p>\n<p><\/span><\/figcaption><\/figure>\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>La vitesse superficielle est une vitesse d&#8217;\u00e9coulement hypoth\u00e9tique calcul\u00e9e comme si la phase ou le fluide donn\u00e9 \u00e9tait le seul \u00e0 s&#8217;\u00e9couler ou \u00e0 \u00eatre pr\u00e9sent dans une section donn\u00e9e.\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 &#8230; <a title=\"Qu&#8217;est-ce que la vitesse superficielle &#8211; D\u00e9bit diphasique &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-vitesse-superficielle-debit-diphasique-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que la vitesse superficielle &#8211; D\u00e9bit 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 vitesse superficielle - D\u00e9bit diphasique - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"La vitesse superficielle est une vitesse d&#039;\u00e9coulement hypoth\u00e9tique calcul\u00e9e comme si la phase ou le fluide donn\u00e9 \u00e9tait le seul qui s&#039;\u00e9coulait ou \u00e9tait pr\u00e9sent dans une section donn\u00e9e. 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