{"id":24635,"date":"2025-10-18T11:00:55","date_gmt":"2025-10-18T09:00:55","guid":{"rendered":"https:\/\/greth.fr\/?p=24635"},"modified":"2025-10-28T11:14:33","modified_gmt":"2025-10-28T10:14:33","slug":"etude-experimentale-des-phenomenes-dynamiques-dans-les-thermosiphons-diphasiques","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/etude-experimentale-des-phenomenes-dynamiques-dans-les-thermosiphons-diphasiques\/","title":{"rendered":"Experimental study of the dynamics of passive thermosiphons"},"content":{"rendered":"<strong><span style=\"text-decoration: underline;\">Summary:<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">Two-phase thermosyphons allow the efficient and passive transfer of thermal energy from a hot source to a cold source. Their physical principle is based on the natural circulation induced by gravity without the need for so-called active means (such as pumps). They can operate in a closed circuit according to the heat transfer mechanisms of evaporation and condensation, with the main advantage of benefiting from a very high value of latent heat of phase change compared to sensible heat. They are used in many industrial applications involving heat exchangers: cooling of electronic components, cooling of rotating machinery, etc.In the context of work on new nuclear reactors, particular attention is being paid to passive systems to ensure safety functions based on two-phase thermosyphons. They are considered as a credible alternative to the essentially active systems present in the current and future EDF fleet. Active systems require an external energy input (electrical or mechanical) to operate, such as hydraulic pumps, control valves, etc.Passive systems, on the other hand, are defined by their activation and operation based on a natural balance between the driving forces available in the reactor during accident situations, generally of moderate intensity (pressure, temperature, density differences, etc.) and the desired low resistance forces (pressure drop in pipes or tubes, thermal resistance through heat exchangers, etc.). These systems do not require any external energy input, except possibly in the initial phase to activate, for example, an opening valve.The physical phenomena associated with passive systems are generally induced by time-varying potentials of moderate intensity, governed by complex and multiple heat transfer mechanisms (condensation, boiling), which can lead to poorly controlled phenomena such as priming and dynamic instabilities of the thermosyphon.This thesis consisted of the design, construction, instrumentation and operation of a new test facility, THEDI (Two-phase THermosiphon). The test campaign allowed-the analysis of the many physical phenomena that occur in a passive two-phase system, both at local and system scale-the evaluation of the performance of the thermosyphon in terms of energy extraction;-the study of transient phenomena: the establishment of fluid circulation and various instability phenomena.These different aspects have been studied for a wide range of operating conditions: heating power, pressure, subcooling, section restriction or presence of non-condensable gases. The database thus created allowed comparison with several predictive models of thermosyphon or two-phase system operation: prediction of flow rate, frequency or amplitude of oscillations, or instability maps. Most of these models are derived from the literature, but the comparison was also made with a one-dimensional model developed during the thesis.<\/p>\n<table border=\"1\" width=\"100%\">\n<tbody>\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Pierre BOYER<\/td>\n<\/tr>\n<tr>\n<td><strong>Date of presentation<\/strong><\/td>\n<\/tr>\n<tr>\n<td>2024, december 12th<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Two phase flow, Passive systems, Thermosiphons<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\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 thermosiphons diphasiques, ou caloducs \u00e0 boucle, permettent de transf\u00e9rer efficacement et de mani\u00e8re passive l\u2019\u00e9nergie thermique d\u2019une source chaude vers une source froide. Leur principe physique repose sur la circulation naturelle induite par la gravit\u00e9 sans avoir recours \u00e0 des moyens dits actifs (de type pompe). Ils peuvent fonctionner en cycle ferm\u00e9, selon les m\u00e9canismes de transfert thermique par \u00e9vaporation et condensation, avec comme principal int\u00e9r\u00eat de b\u00e9n\u00e9ficier d\u2019une valeur tr\u00e8s \u00e9lev\u00e9e de la chaleur latente de changement de phase compar\u00e9e \u00e0 la chaleur sensible. Ils sont utilis\u00e9s dans de nombreuses applications industrielles impliquant des \u00e9changeurs thermiques : refroidissement des composants \u00e9lectroniques, refroidissement de machines tournantes, etc.Dans le cadre des travaux sur les nouveaux r\u00e9acteurs nucl\u00e9aires, une attention particuli\u00e8re est port\u00e9e aux syst\u00e8mes passifs pour assurer les fonctions de s\u00fbret\u00e9, sur la base de thermosiphons diphasiques. Ils sont vus comme des options cr\u00e9dibles repr\u00e9sentant une alternative aux syst\u00e8mes essentiellement actifs pr\u00e9sents sur les centrales du parc EDF actuel et futur. Les syst\u00e8mes actifs requi\u00e8rent un apport d\u2019\u00e9nergie externe (\u00e9lectrique ou m\u00e9canique) afin de les mettre en fonctionnement, comme par exemple pour les pompes hydrauliques, les vannes r\u00e9glantes, etc.<\/p>","protected":false},"author":1,"featured_media":961,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[6380,6925,6926],"class_list":["post-24635","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses","tag-ecoulement-diphasique","tag-systemes-passifs","tag-thermosiphons"],"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>\u00c9tude exp\u00e9rimentale des ph\u00e9nom\u00e8nes dynamiques dans les thermosiphons diphasiques - 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\/etude-experimentale-des-phenomenes-dynamiques-dans-les-thermosiphons-diphasiques\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c9tude exp\u00e9rimentale des ph\u00e9nom\u00e8nes dynamiques dans les thermosiphons diphasiques\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : Les thermosiphons diphasiques, ou caloducs \u00e0 boucle, permettent de transf\u00e9rer efficacement et de mani\u00e8re passive l\u2019\u00e9nergie thermique d\u2019une source chaude vers une source froide. Leur principe physique repose sur la circulation naturelle induite par la gravit\u00e9 sans avoir recours \u00e0 des moyens dits actifs (de type pompe). Ils peuvent fonctionner en cycle ferm\u00e9, selon les m\u00e9canismes de transfert thermique par \u00e9vaporation et condensation, avec comme principal int\u00e9r\u00eat de b\u00e9n\u00e9ficier d\u2019une valeur tr\u00e8s \u00e9lev\u00e9e de la chaleur latente de changement de phase compar\u00e9e \u00e0 la chaleur sensible. Ils sont utilis\u00e9s dans de nombreuses applications industrielles impliquant des \u00e9changeurs thermiques : refroidissement des composants \u00e9lectroniques, refroidissement de machines tournantes, etc.Dans le cadre des travaux sur les nouveaux r\u00e9acteurs nucl\u00e9aires, une attention particuli\u00e8re est port\u00e9e aux syst\u00e8mes passifs pour assurer les fonctions de s\u00fbret\u00e9, sur la base de thermosiphons diphasiques. Ils sont vus comme des options cr\u00e9dibles repr\u00e9sentant une alternative aux syst\u00e8mes essentiellement actifs pr\u00e9sents sur les centrales du parc EDF actuel et futur. 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GRETh","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/greth.fr\/en\/etude-experimentale-des-phenomenes-dynamiques-dans-les-thermosiphons-diphasiques\/","og_locale":"en_US","og_type":"article","og_title":"\u00c9tude exp\u00e9rimentale des ph\u00e9nom\u00e8nes dynamiques dans les thermosiphons diphasiques","og_description":"R\u00e9sum\u00e9 : Les thermosiphons diphasiques, ou caloducs \u00e0 boucle, permettent de transf\u00e9rer efficacement et de mani\u00e8re passive l\u2019\u00e9nergie thermique d\u2019une source chaude vers une source froide. Leur principe physique repose sur la circulation naturelle induite par la gravit\u00e9 sans avoir recours \u00e0 des moyens dits actifs (de type pompe). Ils peuvent fonctionner en cycle ferm\u00e9, selon les m\u00e9canismes de transfert thermique par \u00e9vaporation et condensation, avec comme principal int\u00e9r\u00eat de b\u00e9n\u00e9ficier d\u2019une valeur tr\u00e8s \u00e9lev\u00e9e de la chaleur latente de changement de phase compar\u00e9e \u00e0 la chaleur sensible. Ils sont utilis\u00e9s dans de nombreuses applications industrielles impliquant des \u00e9changeurs thermiques : refroidissement des composants \u00e9lectroniques, refroidissement de machines tournantes, etc.Dans le cadre des travaux sur les nouveaux r\u00e9acteurs nucl\u00e9aires, une attention particuli\u00e8re est port\u00e9e aux syst\u00e8mes passifs pour assurer les fonctions de s\u00fbret\u00e9, sur la base de thermosiphons diphasiques. Ils sont vus comme des options cr\u00e9dibles repr\u00e9sentant une alternative aux syst\u00e8mes essentiellement actifs pr\u00e9sents sur les centrales du parc EDF actuel et futur. Les syst\u00e8mes actifs requi\u00e8rent un apport d\u2019\u00e9nergie externe (\u00e9lectrique ou m\u00e9canique) afin de les mettre en fonctionnement, comme par exemple pour les pompes hydrauliques, les vannes r\u00e9glantes, etc.","og_url":"https:\/\/greth.fr\/en\/etude-experimentale-des-phenomenes-dynamiques-dans-les-thermosiphons-diphasiques\/","og_site_name":"GRETh","article_publisher":"https:\/\/www.facebook.com\/grethfr\/","article_author":"https:\/\/www.facebook.com\/grethfr\/","article_published_time":"2025-10-18T09:00:55+00:00","article_modified_time":"2025-10-28T10:14:33+00:00","og_image":[{"width":424,"height":283,"url":"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-5.jpg","type":"image\/jpeg"}],"author":"GRETh","twitter_card":"summary_large_image","twitter_creator":"@grethfr","twitter_site":"@grethfr","twitter_misc":{"Written by":"GRETh","Est. reading time":"1 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