{"id":46398,"date":"2019-10-22T02:06:27","date_gmt":"2019-10-22T01:06:27","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quest-ce-que-la-qualite-de-la-vapeur-fraction-de-secheresse-definition\/"},"modified":"2020-03-01T09:27:45","modified_gmt":"2020-03-01T08:27:45","slug":"quest-ce-que-la-qualite-de-la-vapeur-fraction-de-secheresse-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-qualite-de-la-vapeur-fraction-de-secheresse-definition\/","title":{"rendered":"Qu&#8217;est-ce que la qualit\u00e9 de la vapeur &#8211; Fraction de s\u00e9cheresse &#8211; D\u00e9finition"},"content":{"rendered":"<div class=\"su-quote su-quote-style-default\">\n<div class=\"su-quote-inner su-clearfix\">La fraction massique de la vapeur dans une r\u00e9gion liquide-vapeur \u00e0 deux phases s&#8217;appelle la qualit\u00e9 de la vapeur (ou fraction de la siccit\u00e9) x, et est donn\u00e9e par une formule simple.\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>Qualit\u00e9 de la vapeur &#8211; Fraction de s\u00e9cheresse<\/h2>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/wet-steam-Vapor-liquid-mixture-min.png\"><img loading=\"lazy\" class=\"alignright size-medium wp-image-16093 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/wet-steam-Vapor-liquid-mixture-min-300x256.png\" alt=\"vapeur humide-vapeur-liquide-m\u00e9lange-min\" width=\"300\" height=\"256\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/wet-steam-Vapor-liquid-mixture-min-300x256.png\" \/><\/a><\/p>\n<p>Voir aussi:\u00a0<a title=\"Propri\u00e9t\u00e9s de la vapeur - Qu'est-ce que la vapeur\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-steam-proprietes-de-steam-definition\/\">Propri\u00e9t\u00e9s de Steam<\/a><\/p>\n<p>Comme le montre le\u00a0<strong>diagramme de phase de l&#8217;eau<\/strong>\u00a0, dans les r\u00e9gions \u00e0 deux phases (par exemple, \u00e0 la limite des phases vapeur \/ liquide), la sp\u00e9cification de la temp\u00e9rature seule d\u00e9terminera la pression et la sp\u00e9cification de la pression d\u00e9finira la temp\u00e9rature.\u00a0Mais ces param\u00e8tres ne d\u00e9finiront pas le volume et l&#8217;enthalpie car il faudra conna\u00eetre la\u00a0<strong>proportion<\/strong>\u00a0relative\u00a0<strong>des deux phases<\/strong>\u00a0pr\u00e9sentes.<\/p>\n<p>La\u00a0<strong>fraction massique<\/strong>\u00a0de la vapeur dans une r\u00e9gion liquide-vapeur \u00e0 deux phases s&#8217;appelle la\u00a0<strong>qualit\u00e9 de<\/strong>\u00a0la\u00a0<strong>vapeur<\/strong>\u00a0(ou fraction de la siccit\u00e9)\u00a0<em>x<\/em>\u00a0, et est donn\u00e9e par la formule suivante:<\/p>\n<p><a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Vapor-quality.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-16088 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Vapor-quality.png\" alt=\"qualit\u00e9 de la vapeur\" width=\"189\" height=\"154\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/Vapor-quality.png\" \/><\/a><\/p>\n<p>La valeur de la qualit\u00e9 va de\u00a0<strong>z\u00e9ro \u00e0 l&#8217;unit\u00e9<\/strong>\u00a0.\u00a0Bien que d\u00e9fini comme un ratio, la qualit\u00e9 est souvent donn\u00e9e en pourcentage.\u00a0De ce point de vue, nous distinguons trois types de base de vapeur.\u00a0Il faut ajouter, \u00e0 x = 0, on parle\u00a0<a title=\"Liquide satur\u00e9 et sous-refroidi\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/saturated-and-subcooled-liquid\/\"><strong>d&#8217;\u00e9tat liquide satur\u00e9<\/strong><\/a>\u00a0(monophas\u00e9).<\/p>\n<ul>\n<li><a title=\"Vapeur humide\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/wet-steam\/\"><strong>Vapeur humide<\/strong><\/a><\/li>\n<li><a title=\"Vapeur s\u00e8che\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/dry-steam\/\"><strong>Vapeur s\u00e8che<\/strong><\/a><\/li>\n<li><a title=\"Vapeur surchauff\u00e9e\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/materials-nuclear-engineering\/properties-steam-what-is-steam\/superheated-steam\/\"><strong>Vapeur surchauff\u00e9e<\/strong><\/a><\/li>\n<\/ul>\n<p>Cette classification de la vapeur a ses limites.\u00a0Consid\u00e9rez le comportement du syst\u00e8me qui est chauff\u00e9 \u00e0 la pression, qui est\u00a0<strong>sup\u00e9rieure \u00e0 la pression critique<\/strong>\u00a0.\u00a0Dans ce cas, il n&#8217;y aurait\u00a0<strong>pas de changement de phase<\/strong>\u00a0du liquide \u00e0 la vapeur.\u00a0Dans tous les \u00e9tats, il n&#8217;y aurait qu&#8217;une seule phase.\u00a0La vaporisation et la condensation ne peuvent se produire que lorsque la pression est inf\u00e9rieure \u00e0 la pression critique.\u00a0Les termes liquide et vapeur ont tendance \u00e0 perdre leur signification.<\/p>\n<p>Voir aussi:\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-saturation-point-debullition-definition\/\">Saturation<\/a><\/p>\n<p>Voir aussi:\u00a0<a href=\"https:\/\/www.thermal-engineering.org\/fr\/quel-est-le-processus-de-limitation-processus-isenthalpic-definition\/\">\u00e9tranglement de vapeur<\/a><\/p>\n<\/div>\n<\/div>\n<p>&nbsp;<\/p>\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<h2><span>Qualit\u00e9 statique vs qualit\u00e9 de flux<\/span><\/h2>\n<p><span>Voir aussi:\u00a0<\/span><a title=\"D\u00e9bit de fluide diphasique\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-quun-ecoulement-de-fluide-a-deux-phases-definition\/\"><span>D\u00e9bit de fluide diphasique<\/span><\/a><\/p>\n<p><span>Dans cette section, nous consid\u00e9rerons le flux simultan\u00e9 de\u00a0<\/span><strong><span>gaz (ou vapeur) et d&#8217;eau liquide<\/span><\/strong><span>\u00a0(tel que celui rencontr\u00e9 dans\u00a0<\/span><a title=\"G\u00e9n\u00e9rateur de vapeur\" href=\"https:\/\/www.nuclear-power.com\/steam-generator\/\"><span>les g\u00e9n\u00e9rateurs de vapeur<\/span><\/a><span>\u00a0et les condenseurs) dans un flux simultan\u00e9 \u00e0 travers un conduit avec une section transversale A. Les indices\u00a0<\/span><strong><span>\u00abv\u00bb<\/span><\/strong><span>\u00a0et\u00a0<\/span><strong><span>\u00ab\u2113\u00bb<\/span><\/strong><span>\u00a0indiquent la\u00a0<\/span><strong><span>phase vapeur<\/span><\/strong><span>\u00a0et\u00a0<\/span><strong><span>la<\/span><\/strong><span>\u00a0phase\u00a0<strong>liquide<\/strong>\u00a0, respectivement.\u00a0Les param\u00e8tres fondamentaux qui caract\u00e9risent ce flux sont:<\/span><\/p>\n<ul>\n<li><a title=\"Fraction nulle - \u00e9coulement diphasique\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/void-fraction-two-phase-flow\/\"><strong><span>Fraction nulle<\/span><\/strong><\/a><\/li>\n<li><a title=\"Qualit\u00e9 statique - Qualit\u00e9 de flux\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/static-quality-flow-quality\/\"><strong><span>Qualit\u00e9 statique<\/span><\/strong><\/a><\/li>\n<li><a title=\"Qualit\u00e9 statique - Qualit\u00e9 de flux\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/static-quality-flow-quality\/\"><strong><span>Qualit\u00e9 du d\u00e9bit<\/span><\/strong><\/a><\/li>\n<li><a title=\"Densit\u00e9 du 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><span>Densit\u00e9 du m\u00e9lange<\/span><\/strong><\/a><\/li>\n<li><a title=\"Rapport de glissement - Rapport de vitesse\" href=\"https:\/\/www.nuclear-power.com\/nuclear-engineering\/fluid-dynamics\/two-phase-fluid-flow\/slip-ratio-velocity-ratio\/\"><strong><span>Rapport de glissement &#8211; Rapport de vitesse<\/span><\/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><span>Vitesse superficielle<\/span><\/strong><\/a><\/li>\n<\/ul>\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><span>Qualit\u00e9 statique<\/span><\/h2>\n<p><span>En g\u00e9n\u00e9ral,\u00a0<\/span><strong><span>la qualit\u00e9 de la vapeur<\/span><\/strong><span>\u00a0est la fraction massique de vapeur dans un m\u00e9lange satur\u00e9.\u00a0La vapeur satur\u00e9e a une qualit\u00e9 de 100% et le liquide satur\u00e9 a une qualit\u00e9 de 0%.<\/span><\/p>\n<p><span>La qualit\u00e9 statique dans un \u00e9coulement de fluide diphasique est d\u00e9finie comme:<\/span><br \/>\n<a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/static-quality-definition.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14772 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/static-quality-definition.png\" alt=\"qualit\u00e9 statique - d\u00e9finition\" width=\"442\" height=\"97\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/static-quality-definition.png\" \/><\/a><\/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-spacer\"><\/div>\n<h2><span>Qualit\u00e9 du d\u00e9bit<\/span><\/h2>\n<p><span>Dans l&#8217;\u00e9coulement de fluide \u00e0 deux phases, il est pratique d&#8217;utiliser la\u00a0<\/span><strong><span>qualit\u00e9 de<\/span><\/strong><span>\u00a0l&#8217;\u00a0<strong>\u00e9coulement<\/strong>\u00a0au lieu de la qualit\u00e9 statique.\u00a0La qualit\u00e9 d&#8217;\u00e9coulement dans un \u00e9coulement de fluide diphasique est d\u00e9finie comme:<\/span><br \/>\n<a href=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-quality-definition.png\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-14773 lazy-loaded\" src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-quality-definition.png\" alt=\"qualit\u00e9 du flux - d\u00e9finition\" width=\"460\" height=\"102\" data-lazy-type=\"image\" data-src=\"https:\/\/thermal-engineering.org\/wp-content\/uploads\/2019\/05\/flow-quality-definition.png\" \/><\/a><\/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<\/span><\/figcaption><\/figure>\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\"><\/div>\n<div class=\"su-spoiler-title\" tabindex=\"0\" role=\"button\">\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","protected":false},"excerpt":{"rendered":"<p>La fraction massique de la vapeur dans une r\u00e9gion liquide-vapeur \u00e0 deux phases s&#8217;appelle la qualit\u00e9 de la vapeur (ou fraction de la siccit\u00e9) x, et est donn\u00e9e par une formule simple.\u00a0G\u00e9nie thermique Qualit\u00e9 de la vapeur &#8211; Fraction de s\u00e9cheresse Voir aussi:\u00a0Propri\u00e9t\u00e9s de Steam Comme le montre le\u00a0diagramme de phase de l&#8217;eau\u00a0, dans les &#8230; <a title=\"Qu&#8217;est-ce que la qualit\u00e9 de la vapeur &#8211; Fraction de s\u00e9cheresse &#8211; D\u00e9finition\" class=\"read-more\" href=\"https:\/\/www.thermal-engineering.org\/fr\/quest-ce-que-la-qualite-de-la-vapeur-fraction-de-secheresse-definition\/\" aria-label=\"En savoir plus sur Qu&#8217;est-ce que la qualit\u00e9 de la vapeur &#8211; Fraction de s\u00e9cheresse &#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 qualit\u00e9 de la vapeur - Fraction de s\u00e9cheresse - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"La fraction massique de la vapeur dans une r\u00e9gion liquide-vapeur \u00e0 deux phases s&#039;appelle la qualit\u00e9 de la vapeur (ou fraction de la siccit\u00e9) x, et est donn\u00e9e par une formule simple. 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