{"id":20550,"date":"2024-06-24T16:30:03","date_gmt":"2024-06-24T14:30:03","guid":{"rendered":"https:\/\/greth.fr\/?p=20550"},"modified":"2024-06-24T16:49:53","modified_gmt":"2024-06-24T14:49:53","slug":"direct-numerical-simulation-of-nucleate-boiling-in-microgravity","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\/","title":{"rendered":"Direct Numerical Simulation of Nucleate Boiling in Microgravity"},"content":{"rendered":"<strong><span style=\"text-decoration: underline;\">Summary :<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">Prediction of heat transfer in nucleate boiling remains an open problem. CFD allows to perform simulations at industrial scales, but requires to model the wall heat transfer. The most advanced models are based on the heat flux partitioning between the latent heat due to the bubble vaporization and the sensible heat directly transferred to the liquid. They require a good prediction of the bubble growth rate, detachment diameter, which can be obtained with DNS. This thesis focus on such simulations. The solver DIVA has been developed at the IMFT and provides accurate simulations of bubble growth in contact line and micro-layer regimes. However, the contact line, which is the bubble interface in contact with the wall, requires a specific attention. This region is subject of significant heat flux and large variation of the contact angle. Several models have been developed to account for it. Yet to our knowledge, no clear coupling methodology between DNS and micro-region model has been proposed in the past. In this work, a coupling between these different scales is proposed. An implicit coupling has been developed between the micro-region model and the DNS, and required a deep computational work. This coupling is presented in a generic manner and can be done regardless of the chosen micro-region model. The convergence of the results is demonstrated in comparison with the RUBI experiment, developed for the study of boiling on an isolated site in microgravity, on board of the International Space Station. The configuration setup allows the measurement of wall temperatures and local heat fluxes through infrared thermography. These measurements are synchronized with bubble growth visualizations by high-speed camera. The coupling, along with the appropriate micro-region model, has significantly improved bubble growth predictions. Afterwards, a study of heat transfer between a superheated wall and a fluid in microgravity has been conducted. Without buoyancy, the bubble stays attached to the wall and thus the investigation is easier. Therefore, the study enables a better understanding of the parameters involved in the micro-region model. The prediction of bubble growth rates has been improved, and the physics at stake at the contact line is better apprehended.<\/p>\n<table border=\"1\" width=\"100%\">\n<tbody>\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Loric TORRES<\/td>\n<\/tr>\n<tr>\n<td><strong>Date of presentation<\/strong><\/td>\n<\/tr>\n<tr>\n<td>2023, 7 december<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Direct Numerical Simulation, Nucleate Boiling, Microgravity<\/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 : La pr\u00e9diction des transferts de chaleur en \u00e9bullition nucl\u00e9\u00e9e est un probl\u00e8me ouvert. La CFD permet des simulations a \u00e9chelle industrielle, mais n\u00e9cessite des mod\u00e9lisations de ces transferts. Aujourd\u2019hui, les mod\u00e8les les plus \u00e9labor\u00e9s sont bas\u00e9s sur une partition du flux de chaleur entre chaleur latente due \u00e0 la vaporisation des bulles et chaleur sensible due au transfert direct de la chaleur vers la phase liquide. Ils n\u00e9cessitent cependant une bonne pr\u00e9diction des taux de croissance des bulles et de leur diam\u00e8tre de d\u00e9tachement, qui peut \u00eatre obtenue par simulation DNS. C\u2019est ce que l\u2019on propose de faire dans cette th\u00e8se. En DNS, les co\u00fbts de calculs pour des simulations \u00e0<\/p>","protected":false},"author":1,"featured_media":963,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[6780,6507,6779],"class_list":["post-20550","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses","tag-ebullition-nucleee","tag-microgravite","tag-simulation-numerique-directe"],"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>Direct Numerical Simulation of Nucleate Boiling in Microgravity - 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\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Direct Numerical Simulation of Nucleate Boiling in Microgravity\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : La pr\u00e9diction des transferts de chaleur en \u00e9bullition nucl\u00e9\u00e9e est un probl\u00e8me ouvert. La CFD permet des simulations a \u00e9chelle industrielle, mais n\u00e9cessite des mod\u00e9lisations de ces transferts. Aujourd\u2019hui, les mod\u00e8les les plus \u00e9labor\u00e9s sont bas\u00e9s sur une partition du flux de chaleur entre chaleur latente due \u00e0 la vaporisation des bulles et chaleur sensible due au transfert direct de la chaleur vers la phase liquide. Ils n\u00e9cessitent cependant une bonne pr\u00e9diction des taux de croissance des bulles et de leur diam\u00e8tre de d\u00e9tachement, qui peut \u00eatre obtenue par simulation DNS. C\u2019est ce que l\u2019on propose de faire dans cette th\u00e8se. En DNS, les co\u00fbts de calculs pour des simulations \u00e0\" \/>\n<meta property=\"og:url\" content=\"https:\/\/greth.fr\/en\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\/\" \/>\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=\"2024-06-24T14:30:03+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-06-24T14:49:53+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-7.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"435\" \/>\n\t<meta property=\"og:image:height\" content=\"276\" \/>\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=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/greth.fr\\\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\\\/\"},\"author\":{\"name\":\"GRETh\",\"@id\":\"https:\\\/\\\/greth.fr\\\/#\\\/schema\\\/person\\\/6e173032c4ce46c14339ff999b721f00\"},\"headline\":\"Direct Numerical Simulation of Nucleate Boiling in Microgravity\",\"datePublished\":\"2024-06-24T14:30:03+00:00\",\"dateModified\":\"2024-06-24T14:49:53+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\\\/\"},\"wordCount\":1250,\"publisher\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/greth.fr\\\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/greth.fr\\\/wp-content\\\/uploads\\\/2015\\\/08\\\/theses-7.jpg\",\"keywords\":[\"\u00c9bullition Nucl\u00e9\u00e9e\",\"microgravit\u00e9\",\"Simulation Num\u00e9rique Directe\"],\"articleSection\":[\"Documents\",\"M\u00e9moires de th\u00e8ses\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/greth.fr\\\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\\\/\",\"url\":\"https:\\\/\\\/greth.fr\\\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\\\/\",\"name\":\"Direct Numerical Simulation of Nucleate Boiling in Microgravity - 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La CFD permet des simulations a \u00e9chelle industrielle, mais n\u00e9cessite des mod\u00e9lisations de ces transferts. Aujourd\u2019hui, les mod\u00e8les les plus \u00e9labor\u00e9s sont bas\u00e9s sur une partition du flux de chaleur entre chaleur latente due \u00e0 la vaporisation des bulles et chaleur sensible due au transfert direct de la chaleur vers la phase liquide. Ils n\u00e9cessitent cependant une bonne pr\u00e9diction des taux de croissance des bulles et de leur diam\u00e8tre de d\u00e9tachement, qui peut \u00eatre obtenue par simulation DNS. C\u2019est ce que l\u2019on propose de faire dans cette th\u00e8se. En DNS, les co\u00fbts de calculs pour des simulations \u00e0","og_url":"https:\/\/greth.fr\/en\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\/","og_site_name":"GRETh","article_publisher":"https:\/\/www.facebook.com\/grethfr\/","article_author":"https:\/\/www.facebook.com\/grethfr\/","article_published_time":"2024-06-24T14:30:03+00:00","article_modified_time":"2024-06-24T14:49:53+00:00","og_image":[{"width":435,"height":276,"url":"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-7.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":"6 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Article","@id":"https:\/\/greth.fr\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\/#article","isPartOf":{"@id":"https:\/\/greth.fr\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\/"},"author":{"name":"GRETh","@id":"https:\/\/greth.fr\/#\/schema\/person\/6e173032c4ce46c14339ff999b721f00"},"headline":"Direct Numerical Simulation of Nucleate Boiling in Microgravity","datePublished":"2024-06-24T14:30:03+00:00","dateModified":"2024-06-24T14:49:53+00:00","mainEntityOfPage":{"@id":"https:\/\/greth.fr\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\/"},"wordCount":1250,"publisher":{"@id":"https:\/\/greth.fr\/#organization"},"image":{"@id":"https:\/\/greth.fr\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\/#primaryimage"},"thumbnailUrl":"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-7.jpg","keywords":["\u00c9bullition Nucl\u00e9\u00e9e","microgravit\u00e9","Simulation Num\u00e9rique Directe"],"articleSection":["Documents","M\u00e9moires de th\u00e8ses"],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/greth.fr\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\/","url":"https:\/\/greth.fr\/direct-numerical-simulation-of-nucleate-boiling-in-microgravity\/","name":"Direct Numerical Simulation of Nucleate Boiling in Microgravity - 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