{"id":10675,"date":"2019-01-17T16:40:26","date_gmt":"2019-01-17T15:40:26","guid":{"rendered":"https:\/\/greth.fr\/?p=10675"},"modified":"2023-03-02T16:16:05","modified_gmt":"2023-03-02T15:16:05","slug":"experimental-study-of-the-fundamental-phenomena-involved-in-pool-boiling-at-low-pressure","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/experimental-study-of-the-fundamental-phenomena-involved-in-pool-boiling-at-low-pressure\/","title":{"rendered":"Experimental study of the fundamental phenomena involved in pool boiling at low pressure"},"content":{"rendered":"<p><strong><span style=\"text-decoration: underline;\">Summary :<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">L\u2019\u00e9bullition est un mode de transfert de chaleur intervenant dans de nombreux syst\u00e8mes thermiques ou \u00e9nerg\u00e9tiques en raison de son efficacit\u00e9. Dans certains syst\u00e8mes \u2013 par exemple les \u00e9vaporateurs des machines frigorifiques \u00e0 sorption ou certains thermosiphons \u2013 l\u2019\u00e9bullition se produit sous de faibles pressions. Dans ces conditions, la pression statique induite par la colonne de liquide au-dessus de la surface o\u00f9 les bulles de vapeur se forment n\u2019est pas n\u00e9gligeable devant la pression de saturation pr\u00e9valant au niveau de la surface libre, la pression locale dans le liquide \u00e9tant alors la somme de la pression de saturation et de la pression statique. D\u00e8s lors, la pression et le sous-refroidissement induit par la pression ne peuvent plus \u00eatre consid\u00e9r\u00e9s comme homog\u00e8nes autour des bulles, ce qui conduit \u00e0 des inhomog\u00e9n\u00e9it\u00e9s des propri\u00e9t\u00e9s thermophysiques dans le fluide. En cons\u00e9quence, les influences relatives des diff\u00e9rentes forces s\u2019exer\u00e7ant sur une bulle lors de sa croissance ne sont plus les m\u00eames que dans des conditions de pressions normales ou hautes, ce qui implique une dynamique de bulles diff\u00e9rente : la taille, la forme ou encore la fr\u00e9quence des bulles sont modifi\u00e9es. Les transferts thermiques sont \u00e9galement affect\u00e9s par ces conditions particuli\u00e8res.<\/p>\n<p style=\"text-align: justify;\">Afin d\u2019observer l\u2019influence de la pression sur l\u2019\u00e9bullition en vase d\u2019un point de vue fondamental, ce travail s\u2019est restreint \u00e0 l\u2019\u00e9tude exp\u00e9rimentale de l\u2019\u00e9bullition en site unique en r\u00e9gime de bulles isol\u00e9es. D\u2019un point de vue pratique, ce r\u00e9gime est atteint \u2013 en orientation horizontale vers le haut \u2013 sur une surface en cuivre polie miroir au centre de laquelle une cavit\u00e9 conique a \u00e9t\u00e9 cr\u00e9\u00e9e. Une fois ce site de nucl\u00e9ation artificiel activ\u00e9, le flux impos\u00e9 est ajust\u00e9 de sorte \u00e0 ce que seul ce site reste actif. L\u2019eau a d\u2019abord \u00e9t\u00e9 test\u00e9e \u00e0 flux impos\u00e9 et hauteur de liquide constants pour une gamme de pression s\u2019\u00e9tendant de la pression atmosph\u00e9rique (Pv = 101,4 kPa (Tv = 100 \u00b0C)) jusqu\u2019\u00e0 Pv = 4,2 kPa (Tv = 30 \u00b0C). En termes de dynamique de bulles, quatre comportements ont pu \u00eatre identifi\u00e9s gr\u00e2ce \u00e0 la visualisation par cam\u00e9ra rapide. Ainsi, selon la pression impos\u00e9e, la forme des bulles change : quasi-sph\u00e9riques \u00e0 proximit\u00e9 de la pression atmosph\u00e9rique, elles prennent la forme de champignon et\/ou de colonne de vapeur puis uniquement de champignon et enfin de sph\u00e9ro\u00efde aplati au fur et \u00e0 mesure que la pression d\u00e9cro\u00eet. Pour certains de ces r\u00e9gimes, l\u2019emploi d\u2019un outil de traitement d\u2019images adapt\u00e9 \u2013 d\u00e9velopp\u00e9 sous l\u2019environnement MATLAB dans le cadre de cette th\u00e8se \u2013 a alors permis la quantification de plusieurs param\u00e8tres de la dynamique (temps de croissance, fr\u00e9quence de d\u00e9tachement, volume instantan\u00e9, etc.) \u00e0 partir de l\u2019exploitation des s\u00e9quences vid\u00e9o enregistr\u00e9es. Les \u00e9volutions de ces param\u00e8tres en fonction de la pression de travail (\u00e9valu\u00e9e au niveau de la surface chauff\u00e9e pour tenir compte de la pression induite par la colonne de liquide) ont donc pu \u00eatre \u00e9tudi\u00e9es. Afin de g\u00e9n\u00e9raliser le concept d\u2019\u00e9bullition en vase \u00e0 \u00ab basse pression \u00bb et de mieux en appr\u00e9hender les ph\u00e9nom\u00e8nes fondamentaux, de nouveaux essais ont \u00e9t\u00e9 ensuite r\u00e9alis\u00e9s avec un second fluide, le cyclohexane, choisi en respectant des crit\u00e8res de similitude thermodynamique vis-\u00e0-vis de l\u2019eau bouillant \u00e0 des pressions inf\u00e9rieures \u00e0 la pression atmosph\u00e9rique. Les conditions op\u00e9ratoires des tests en cyclohexane ont \u00e9t\u00e9 d\u00e9termin\u00e9es en consid\u00e9rant \u00e0 la fois les crit\u00e8res de similitude thermodynamique mentionn\u00e9s pr\u00e9c\u00e9demment et les limites exp\u00e9rimentales du banc d\u2019essais. Certains comportements d\u00e9j\u00e0 observ\u00e9s avec l\u2019eau ont \u00e9t\u00e9 retrouv\u00e9s avec le cyclohexane. Par la suite, l\u2019\u00e9tude comparative des comportements des deux fluides a permis d\u2019identifier un certain nombre de param\u00e8tres responsables des ph\u00e9nom\u00e8nes sp\u00e9cifiques de l\u2019\u00e9bullition \u00e0 basse pression.<\/p>\n<p style=\"text-align: justify;\">Au-del\u00e0 de ces r\u00e9sultats, le dispositif exp\u00e9rimental a \u00e9t\u00e9 am\u00e9lior\u00e9 afin de lui conf\u00e9rer de nouvelles fonctionnalit\u00e9s. En particulier, deux nouveaux \u00e9chantillons ont \u00e9t\u00e9 utilis\u00e9s comme \u00e9l\u00e9ments chauffants. Le premier, muni d\u2019un fluxm\u00e8tre thermique multizone utilis\u00e9 comme surface d\u2019\u00e9bullition, permet la mesure \u2013 synchrone avec l\u2019acquisition par cam\u00e9ra rapide \u2013 de la densit\u00e9 de flux transf\u00e9r\u00e9e localement sous une bulle au cours de sa croissance. Le d\u00e9placement de la ligne triple lors de la croissance d\u2019une bulle a alors pu \u00eatre suivi tant visuellement que thermiquement. Le second \u00e9chantillon permet quant \u00e0 lui l\u2019\u00e9tude de surfaces  structur\u00e9es. Ainsi, plusieurs g\u00e9om\u00e9tries de surface chauff\u00e9e telles que des agencements de tunnels perfor\u00e9s ont \u00e9t\u00e9 \u00e9tudi\u00e9es. Ces g\u00e9om\u00e9tries sont en effet suppos\u00e9es plus proches de celles rencontr\u00e9es dans les syst\u00e8mes r\u00e9els que la surface plane polie avec site artificiel pr\u00e9c\u00e9demment test\u00e9e. L\u2019influence de ces structurations de surface sur la ph\u00e9nom\u00e9nologie de l\u2019\u00e9bullition \u00e0 basse pression a alors pu \u00eatre analys\u00e9e. Les r\u00e9sultats obtenus ouvrent des perspectives encourageantes pour mieux analyser les comportements sp\u00e9cifiques de l\u2019\u00e9bullition \u00e0 basse pression afin de pouvoir les exploiter dans des applications pratiques.<\/p>\n<table width=\"100%\" border=\"1\">\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Sandra MICHAIE<\/td>\n<\/tr>\n<tr>\n<td><strong>Date de publication<\/strong><\/td>\n<\/tr>\n<tr>\n<td>30 novembre 2018<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>\u00c9bullition en vase, basse pression, essais exp\u00e9rimentaux, visualisation, dynamique de bulles, comparaison de fluides, similitude thermodynamique.<\/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 : L\u2019\u00e9bullition est un mode de transfert de chaleur intervenant dans de nombreux syst\u00e8mes thermiques ou \u00e9nerg\u00e9tiques en raison de son efficacit\u00e9. Dans certains syst\u00e8mes \u2013 par exemple les \u00e9vaporateurs des machines frigorifiques \u00e0 sorption ou certains thermosiphons \u2013 l\u2019\u00e9bullition se produit sous de faibles pressions. Dans ces conditions, la pression statique induite par &hellip;<\/p>","protected":false},"author":1,"featured_media":964,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[6596,6600,6599,6595,6597,6601,6598],"class_list":["post-10675","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses","tag-basse-pression","tag-comparaison-de-fluides","tag-dynamique-de-bulles","tag-ebullition-en-vase","tag-essais-experimentaux","tag-similitude-thermodynamique","tag-visualisation"],"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 study of the fundamental phenomena involved in pool boiling at low pressure - 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-study-of-the-fundamental-phenomena-involved-in-pool-boiling-at-low-pressure\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Experimental study of the fundamental phenomena involved in pool boiling at low pressure\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : L\u2019\u00e9bullition est un mode de transfert de chaleur intervenant dans de nombreux syst\u00e8mes thermiques ou \u00e9nerg\u00e9tiques en raison de son efficacit\u00e9. Dans certains syst\u00e8mes \u2013 par exemple les \u00e9vaporateurs des machines frigorifiques \u00e0 sorption ou certains thermosiphons \u2013 l\u2019\u00e9bullition se produit sous de faibles pressions. 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