{"id":20555,"date":"2024-06-26T11:40:35","date_gmt":"2024-06-26T09:40:35","guid":{"rendered":"https:\/\/greth.fr\/?p=20555"},"modified":"2024-06-26T12:03:32","modified_gmt":"2024-06-26T10:03:32","slug":"etude-experimentale-et-modelisation-du-transfert-de-chaleur-de-lebullition-transitoire","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/etude-experimentale-et-modelisation-du-transfert-de-chaleur-de-lebullition-transitoire\/","title":{"rendered":"Experimental study of heat transfer during transient boiling"},"content":{"rendered":"<strong><span style=\"text-decoration: underline;\">Summary :<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">The study of rapid transient boiling is an important issue in the nuclear safety. Such a phenomenon may occur in the case of a RIA (Reactivity Initiated Accident) in the core of a nuclear reactor powerplant, where a power excursion can trigger the formation of a vapour film around the fuel rod, leading to an important rise of the rod temperature and a risk of failure. Some studies in reactor conditions provided transient boiling curves but the modeling lacks of reliability. In collaboration with the IRSN (Institut de Radioprotection et de S\u00fbret\u00e9 Nucl\u00e9aire), an experiment model was built at the Institute of Fluid Mechanics of Toulouse. It generates the flow of a refrigerant, HFE7000, in a semi-annular section channel, whose inner wall is made of a metal foil rapidly heated by Joule effect, simulating the heating of a fuel rod. Infrared thermography is used to measure the temperature of the metal foil, painted with a black paint to increase its emissivity, causing also an increase of the wall thermal resistance. The measurement accuracy of the interest temperature has been optimized according to the paint thickness and a correction on the energy balance takes account this parameter. These measurements are coupled with a high-speed camera that allows visualizing the boiling regimes and get bubble sizes using image processing algorithms. On a flux-temperature diagram, the heat transfers are represented both for steady and transient regimes. Each boiling regime is then reviewed : convection, onset of nucleate boiling, nucleate boiling, boiling crisis, film boiling and rewetting. Steady regimes are correctly modeled by usual correlations. Transient convection is characterized over the whole wall and its evolution is closed to the quasi-steady solution. It is shown that heat transfer during the transition to nucleate boiling are strongly related to the formation of a large vapor phase that spreads on the wall. A local study of this propagation is then necessary. In order to simulate and control transient temperature during nucleate boiling, a P.I.D. is implemented to impose a steady or ramps temperature (from 5 to 500 K.s 1 ). The results in nucleate boiling make it possible to recover the results of the literature in both steady and transient conditions. The experiment allows to study the heat transfer when a vapor film is formed and insulates the wall. The film boiling regime during heating or the cooling of the wall can thus be stabilized for several seconds with this system. The conditions for triggering of film boiling are thus characterized, as its spread dynamic and its transfers once established. Finally, the implementation of the physical characteristics of our experience in IRSN\u2019s SCANAIR code allows us to begin to calculate and compare our experimental results with numerical simulations. Unsteady conduction calculations are applied to the measured temperature to analyze our results during the convection regime and after the onset of boiling.<\/p>\n<table border=\"1\" width=\"100%\">\n<tbody>\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Valentin SCHEIFF<\/td>\n<\/tr>\n<tr>\n<td><strong>Date of presentation<\/strong><\/td>\n<\/tr>\n<tr>\n<td>2018, 13 december<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Reactivity Initiated Accident (RIA), Transient boiling, Convection, Onset of nucleate boiling (ONB), Nucleate boiling, Boiling crisis, Critical heat flux (CHF), Film boiling, Rewetting, Infrared thermography, SCANAIR<\/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 : L\u2019\u00e9tude de l\u2019\u00e9bullition transitoire est un enjeu important pour la suret\u00e9 nucl\u00e9aire. Un tel ph\u00e9nom\u00e8ne peut se produire lors d\u2019un accident de type RIA (Reactivity Initiated Accident)dans un r\u00e9acteur nucl\u00e9aire o\u00f9 le pic de puissance au niveau d\u2019un crayon de combustible peut d\u00e9clencher une \u00e9bullition transitoire conduisant \u00e0 une forte augmentation de la temp\u00e9rature de la gaine et \u00e0 un risque de rupture. Plusieurs \u00e9tudes en conditions r\u00e9acteurs ont permis d\u2019obtenir des courbes d\u2019\u00e9bullition transitoires mais la mod\u00e9lisation qui en d\u00e9coule manque encore de<\/p>","protected":false},"author":1,"featured_media":100,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[6784,6786,6788,6787,6789,6780,6785,6673,6790,6791,6478],"class_list":["post-20555","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses","tag-accident-dinsertion-de-reactivite-ria","tag-convection","tag-crise-debullition","tag-declenchement-de-lebullition","tag-ebullition-en-film","tag-ebullition-nucleee","tag-echanges-thermiques-transitoires","tag-flux-critique","tag-remouillage","tag-scanair","tag-thermographie-infrarouge"],"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 et mod\u00e9lisation du transfert de chaleur de l&#039;\u00e9bullition transitoire - 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-et-modelisation-du-transfert-de-chaleur-de-lebullition-transitoire\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00c9tude exp\u00e9rimentale et mod\u00e9lisation du transfert de chaleur de l&#039;\u00e9bullition transitoire\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : L\u2019\u00e9tude de l\u2019\u00e9bullition transitoire est un enjeu important pour la suret\u00e9 nucl\u00e9aire. Un tel ph\u00e9nom\u00e8ne peut se produire lors d\u2019un accident de type RIA (Reactivity Initiated Accident)dans un r\u00e9acteur nucl\u00e9aire o\u00f9 le pic de puissance au niveau d\u2019un crayon de combustible peut d\u00e9clencher une \u00e9bullition transitoire conduisant \u00e0 une forte augmentation de la temp\u00e9rature de la gaine et \u00e0 un risque de rupture. 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Plusieurs \u00e9tudes en conditions r\u00e9acteurs ont permis d\u2019obtenir des courbes d\u2019\u00e9bullition transitoires mais la mod\u00e9lisation qui en d\u00e9coule manque encore de","og_url":"https:\/\/greth.fr\/en\/etude-experimentale-et-modelisation-du-transfert-de-chaleur-de-lebullition-transitoire\/","og_site_name":"GRETh","article_publisher":"https:\/\/www.facebook.com\/grethfr\/","article_author":"https:\/\/www.facebook.com\/grethfr\/","article_published_time":"2024-06-26T09:40:35+00:00","article_modified_time":"2024-06-26T10:03:32+00:00","og_image":[{"width":424,"height":283,"url":"https:\/\/greth.fr\/wp-content\/uploads\/2015\/06\/offre-3.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":"7 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