{"id":46622,"date":"2019-10-22T20:21:18","date_gmt":"2019-10-22T19:21:18","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/quelle-est-la-correlation-de-lockhart-martinelli-definition\/"},"modified":"2020-03-02T13:06:22","modified_gmt":"2020-03-02T12:06:22","slug":"quelle-est-la-correlation-de-lockhart-martinelli-definition","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/fr\/quelle-est-la-correlation-de-lockhart-martinelli-definition\/","title":{"rendered":"Quelle est la corr\u00e9lation de Lockhart-Martinelli – D\u00e9finition"},"content":{"rendered":"
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Corr\u00e9lation de Lockhart-Martinelli.\u00a0La m\u00e9thode de Lockhart et Martinelli est la m\u00e9thode des flux s\u00e9par\u00e9s qui pr\u00e9dit la chute de pression par frottement \u00e0 deux phases.\u00a0G\u00e9nie thermique<\/div>\n<\/div>\n
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Corr\u00e9lation de Lockhart-Martinelli<\/h2>\n

Une autre approche pour calculer la\u00a0perte de charge en deux phases<\/a>\u00a0est\u00a0le mod\u00e8le des phases s\u00e9par\u00e9es.<\/strong><\/p>\n

Dans ce mod\u00e8le, les\u00a0phases<\/strong>\u00a0sont consid\u00e9r\u00e9es comme s\u2019\u00e9coulant\u00a0s\u00e9par\u00e9ment<\/strong>\u00a0dans le canal, chacune occupant une\u00a0fraction donn\u00e9e<\/strong>\u00a0de la section transversale du canal et ayant chacune une\u00a0vitesse donn\u00e9e<\/strong>\u00a0.\u00a0Il est \u00e9vident que la pr\u00e9vision de la\u00a0fraction de vide<\/strong><\/a>\u00a0est tr\u00e8s importante pour ces m\u00e9thodes.\u00a0De nombreuses m\u00e9thodes sont disponibles pour pr\u00e9dire la fraction de vide.<\/p>\n

La m\u00e9thode de\u00a0Lockhart et Martinelli<\/strong>\u00a0est la m\u00e9thode originale qui pr\u00e9dit la\u00a0perte<\/strong>\u00a0de charge par friction \u00e0\u00a0deux phases<\/strong>\u00a0sur la base d’un multiplicateur de friction pour la\u00a0phase liquide ou en phase vapeur<\/strong>\u00a0:<\/p>\n

Dp\u00a0Frict<\/sub>\u00a0= \u03a6\u00a0ltt\u00a0<\/sub>2<\/sup>\u00a0.\u00a0\u2206p\u00a0l<\/sub><\/strong>\u00a0(liquidp en phase liquide)<\/p>\n

Dp\u00a0Frict<\/sub>\u00a0= \u03a6\u00a0gtt\u00a0<\/sub>2<\/sup>\u00a0.\u00a0P\u00a0g<\/sub><\/strong>\u00a0(vaporp en phase vapeur)<\/p>\n

Les facteurs de friction monophas\u00e9s du liquide\u00a0f\u00a0l<\/sub><\/strong>et la vapeur\u00a0f\u00a0g<\/sub><\/strong>\u00a0sont\u00a0bas\u00e9s sur la seule phase<\/a>\u00a0circulant seul dans le canal, soit\u00a0laminaire visqueux<\/a>\u00a0(v) ou\u00a0turbulents<\/a>\u00a0r\u00e9gimes (t).<\/p>\n

\u2206p\u00a0l<\/sub><\/strong>\u00a0peut \u00eatre calcul\u00e9 de mani\u00e8re classique, mais avec l’application de\u00a0(1-x)\u00a02<\/sup><\/strong>\u00a0dans l’expression et\u00a0\u2206p\u00a0g<\/sub><\/strong>\u00a0avec l’application de la qualit\u00e9 de la vapeur\u00a0x\u00a02,<\/sup><\/strong>\u00a0respectivement.<\/p>\n

Les multiplicateurs \u00e0\u00a0deux phases\u00a0\u03a6\u00a0ltt\u00a0<\/sub>2<\/sup><\/strong>\u00a0et\u00a0\u03a6\u00a0gtt\u00a0<\/sub>2<\/sup><\/strong>sont \u00e9gaux \u00e0:<\/p>\n

\"Lockhart-Martinelli<\/a><\/p>\n

o\u00f9\u00a0X\u00a0tt<\/sub><\/strong>est le\u00a0param\u00e8tre de Martinelli<\/strong>\u00a0d\u00e9fini comme suit:<\/p>\n

\"Param\u00e8tre<\/a><\/p>\n

\"Lockhart-Martinelli<\/a>et la valeur de\u00a0C<\/strong>\u00a0dans ces \u00e9quations d\u00e9pend des\u00a0r\u00e9gimes d’\u00e9coulement<\/a>\u00a0du liquide et de la vapeur.\u00a0Ces valeurs sont dans le tableau suivant.<\/p>\n

La corr\u00e9lation de Lockhart-Martinelli<\/strong>\u00a0s\u2019est av\u00e9r\u00e9e ad\u00e9quate pour les \u00e9coulements diphasiques soumis \u00e0 des pressions faibles et mod\u00e9r\u00e9es.\u00a0Pour les applications \u00e0 des pressions plus \u00e9lev\u00e9es, les mod\u00e8les r\u00e9vis\u00e9s de Martinelli et Nelson (1948) et de Thom (1964) sont recommand\u00e9s.<\/p>\n<\/div>\n<\/div>\n

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\"mod\u00e8le<\/a><\/p>\n

Corr\u00e9lations pour la fraction de vide et la chute de pression de friction (Lockhart et Martinelli, 1949)<\/span><\/p>\n

……………………………………………………………………………………………………………………………….<\/p>\n

Cet article est bas\u00e9 sur la traduction automatique de l’article original en anglais. Pour plus d’informations, voir l’article en anglais. Pouvez vous nous aider Si vous souhaitez corriger la traduction, envoyez-la \u00e0 l’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":"

Corr\u00e9lation de Lockhart-Martinelli.\u00a0La m\u00e9thode de Lockhart et Martinelli est la m\u00e9thode des flux s\u00e9par\u00e9s qui pr\u00e9dit la chute de pression par frottement \u00e0 deux phases.\u00a0G\u00e9nie thermique Corr\u00e9lation de Lockhart-Martinelli Une autre approche pour calculer la\u00a0perte de charge en deux phases\u00a0est\u00a0le mod\u00e8le des phases s\u00e9par\u00e9es. Dans ce mod\u00e8le, les\u00a0phases\u00a0sont consid\u00e9r\u00e9es comme s\u2019\u00e9coulant\u00a0s\u00e9par\u00e9ment\u00a0dans le canal, chacune occupant … 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":"\nQuelle est la corr\u00e9lation de Lockhart-Martinelli - D\u00e9finition<\/title>\n<meta name=\"description\" content=\"Corr\u00e9lation de Lockhart-Martinelli. 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