{"id":1142,"date":"2005-08-10T16:40:59","date_gmt":"2005-08-10T14:40:59","guid":{"rendered":"http:\/\/greth.fr\/?p=1142"},"modified":"2023-02-24T10:08:24","modified_gmt":"2023-02-24T09:08:24","slug":"experimental-two-phase-fluid-flow-in-microchannels","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/experimental-two-phase-fluid-flow-in-microchannels\/","title":{"rendered":"Experimental two-phase fluid flow in microchannels"},"content":{"rendered":"<p><strong><span style=\"text-decoration: underline;\">Summary :<\/span><\/strong><br \/>\nLes micro ou mini dissipateurs thermiques sont utilis\u00e9s dans les micro technologies pour leurs tr\u00e8s hautes performances de refroidissement. Ces dissipateurs thermiques ne sont cependant as encore suffisamment \u00e9tudi\u00e9s. Pour cette raison, une \u00e9tude exp\u00e9rimentale des \u00e9coulements biphasiques a \u00e9t\u00e9 r\u00e9alis\u00e9e sur deux tubes \u00e0 section circulaire (D = 0.509 et 0.790 mm) et pour deux fluides diff\u00e9rents : R-134a et R-245fa.<\/p>\n<p>Une m\u00e9thode de mesure optique a \u00e9t\u00e9 appliqu\u00e9e afin de caract\u00e9riser les \u00e9coulements liquidevapeur en microtubes, en d\u00e9terminant la fr\u00e9quence des bulles quittant un micro \u00e9vaporateur, la vitesse de coalescence de ces bulles, leur longueur ainsi que leur vitesse moyenne. Quatre principaux r\u00e9gimes d'\u00e9coulement (\u00e9coulement \u00e0 bulles, \u00e9coulement \u00e0 bouchons, \u00e9coulement semi-annulaire et \u00e9coulement annulaire) avec leurs transitions (\u00e9coulement \u00e0 bulles\/bouchons et \u00e9coulement \u00e0 bouchons\/semi-annulaire) ont \u00e9t\u00e9 observ\u00e9s. Une nouvelle forme de carte d'\u00e9coulement a \u00e9t\u00e9 d\u00e9velopp\u00e9e. La premi\u00e8re zone correspond au r\u00e9gime d'\u00e9coulement \u00e0 bulles isol\u00e9es qui inclut l'\u00e9coulement \u00e0 bulles et\/ou l'\u00e9coulement \u00e0 bouchons. Ce r\u00e9gime est pr\u00e9sent jusqu'au d\u00e9but de la coalescence. La seconde zone est le r\u00e9gime de coalescence des bulles. Ce r\u00e9gime est pr\u00e9sent jusqu'\u00e0 la fin de la coalescence. La troisi\u00e8me zone est la zone annulaire, limit\u00e9e par la quatri\u00e8me zone qui est le d\u00e9but du flux de chaleur critique. Cette nouvelle carte d'\u00e9coulement peut \u00eatre utilis\u00e9e dans des mod\u00e8les de transfert de chaleur et pour le dimensionnement de micro \u00e9vaporateurs.<\/p>\n<p>La vitesse de la vapeur, ou indirectement le taux de vide, a \u00e9t\u00e9 mesur\u00e9e. Pour le R-134a, l'\u00e9coulement peut \u00eatre consid\u00e9r\u00e9 comme homog\u00e8ne (ou proche de l'homog\u00e8ne). Pour le R-245fa, des instabilit\u00e9s ont \u00e9t\u00e9 observ\u00e9es et les r\u00e9sultats ont montr\u00e9 des vitesses de bulles de vapeur inf\u00e9rieures \u00e0 celles d'un \u00e9coulement homog\u00e8ne.<\/p>\n<p>Les pertes de charge par frottements ont \u00e9t\u00e9 mesur\u00e9es pour un grand intervalle de conditions exp\u00e9rimentales, en consid\u00e9rant les deux dimensions de tubes et les deux fluides. La variation du coefficient de frottement biphasique en fonction du nombre de Reynolds biphasique permet de distinguer trois r\u00e9gimes: un r\u00e9gime laminaire pour ReTP < 2000, un r\u00e9gime de transition pour 2000 \u2264 ReTP \u2264 8000 et un r\u00e9gime turbulent pour ReTP \u2265 8000. La corr\u00e9lation de M\u00fcller-Steinhagen pr\u00e9dit correctement l'\u00e9coulement biphasique en r\u00e9gime turbulent. De nouvelles valeurs du flux de chaleur critique ont \u00e9t\u00e9 mesur\u00e9es avec le dispositif exp\u00e9rimental.\n\nUne nouvelle corr\u00e9lation bas\u00e9e sur celle de Katto-Ohno a \u00e9t\u00e9 d\u00e9velopp\u00e9e pour pr\u00e9dire le flux de chaleur critique en microtubes circulaires uniform\u00e9ment chauff\u00e9s. De plus, une nouvelle courbe de transition entre le r\u00e9gime annulaire et la zone d'ass\u00e8chement est propos\u00e9e.\n\nLes r\u00e9sultats obtenus peuvent \u00eatre directement utilis\u00e9s pour d\u00e9velopper un mod\u00e8le de transfert de chaleur et de pertes de charge en microcanaux ainsi que pour dimensionner les micro dissipateurs thermiques.\n\n\n\n<table width=\"100%\" border=\"1\">\n<tr>\n<td><strong>Auteur(s)<\/strong><\/td>\n<\/tr>\n<tr>\n<td>REVELLIN R\u00e9mi<\/td>\n<\/tr>\n<tr>\n<td><strong>Ann\u00e9e<\/strong><\/td>\n<\/tr>\n<tr>\n<td>2005<\/td>\n<\/tr>\n<\/table>\n\n&nbsp;<br \/>\n\n<div class=\"eds-animate edsanimate-sis-hidden\" data-eds-entry-animation=\"bounceIn\" data-eds-entry-delay=\"0\" data-eds-entry-duration=\"1\" data-eds-entry-timing=\"linear\" data-eds-exit-animation=\"\" data-eds-exit-delay=\"\" data-eds-exit-duration=\"\" data-eds-exit-timing=\"\" data-eds-repeat-count=\"1\" data-eds-keep=\"yes\" data-eds-animate-on=\"load\" data-eds-scroll-offset=\"\">\n\t\t<div class=\"box info\">\n\t\t\t<div class=\"box-inner-block\">\n\t\t\t\t<span class=\"fa tie-shortcode-boxicon\"><\/span>\n<p style=\"text-align: justify;\"><strong>&#x2666; The full version is only available for subscribers <a style=\"text-decoration: none;\" href=\"\/en\/offre-du-greth\/\"><span style=\"background-color: #3db2ea; color: #fff;\">\"ESSENTIEL\"<\/span><\/a> or <a style=\"text-decoration: none;\" href=\"\/en\/offre-du-greth\/\"><span style=\"background-color: #c6002c; color: #fff;\">\"PREMIUM\"<\/span><\/a> of GRETh!<\/strong><\/p>\n<p>&#x2666; If you are already a member \/ subscriber, you must identify yourself by <a href=\"\/wp-login.php\"><strong>clicking here<\/strong><\/a>.<br \/>\n&#x2666; If you are not a member, you can consult the offer proposed by GRETh by <a href=\"\/en\/offre-du-greth\/\"><strong>clicking here<\/strong><\/a> as well as the conditions of membership by <a href=\"\/en\/conditions-adhesion\/\"><strong>clicking here<\/strong><\/a>.\n\t\t\t<\/div>\n\t\t<\/div>\n\t<\/div>","protected":false},"excerpt":{"rendered":"<p>R\u00e9sum\u00e9 : Les micro ou mini dissipateurs thermiques sont utilis\u00e9s dans les micro technologies pour leurs tr\u00e8s hautes performances de refroidissement. Ces dissipateurs thermiques ne sont cependant as encore suffisamment \u00e9tudi\u00e9s. Pour cette raison, une \u00e9tude exp\u00e9rimentale des \u00e9coulements biphasiques a \u00e9t\u00e9 r\u00e9alis\u00e9e sur deux tubes \u00e0 section circulaire (D = 0.509 et 0.790 mm) &hellip;<\/p>","protected":false},"author":1,"featured_media":960,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[],"class_list":["post-1142","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.9 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Experimental two-phase fluid flow in microchannels - GRETh<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/greth.fr\/en\/experimental-two-phase-fluid-flow-in-microchannels\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Experimental two-phase fluid flow in microchannels\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : Les micro ou mini dissipateurs thermiques sont utilis\u00e9s dans les micro technologies pour leurs tr\u00e8s hautes performances de refroidissement. 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Pour cette raison, une \u00e9tude exp\u00e9rimentale des \u00e9coulements biphasiques a \u00e9t\u00e9 r\u00e9alis\u00e9e sur deux tubes \u00e0 section circulaire (D = 0.509 et 0.790 mm) &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/greth.fr\/en\/experimental-two-phase-fluid-flow-in-microchannels\/\" \/>\n<meta property=\"og:site_name\" content=\"GRETh\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/grethfr\/\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/grethfr\/\" \/>\n<meta property=\"article:published_time\" content=\"2005-08-10T14:40:59+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-02-24T09:08:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-4.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"416\" \/>\n\t<meta property=\"og:image:height\" content=\"288\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"GRETh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@grethfr\" \/>\n<meta name=\"twitter:site\" content=\"@grethfr\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"GRETh\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/greth.fr\\\/experimental-two-phase-fluid-flow-in-microchannels\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/experimental-two-phase-fluid-flow-in-microchannels\\\/\"},\"author\":{\"name\":\"GRETh\",\"@id\":\"https:\\\/\\\/greth.fr\\\/#\\\/schema\\\/person\\\/6e173032c4ce46c14339ff999b721f00\"},\"headline\":\"Experimental two-phase fluid flow in microchannels\",\"datePublished\":\"2005-08-10T14:40:59+00:00\",\"dateModified\":\"2023-02-24T09:08:24+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/experimental-two-phase-fluid-flow-in-microchannels\\\/\"},\"wordCount\":809,\"publisher\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/experimental-two-phase-fluid-flow-in-microchannels\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/greth.fr\\\/wp-content\\\/uploads\\\/2015\\\/08\\\/theses-4.jpg\",\"articleSection\":[\"Documents\",\"M\u00e9moires de th\u00e8ses\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/greth.fr\\\/experimental-two-phase-fluid-flow-in-microchannels\\\/\",\"url\":\"https:\\\/\\\/greth.fr\\\/experimental-two-phase-fluid-flow-in-microchannels\\\/\",\"name\":\"Experimental two-phase fluid flow in microchannels - 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