{"id":24642,"date":"2025-10-27T12:00:07","date_gmt":"2025-10-27T11:00:07","guid":{"rendered":"https:\/\/greth.fr\/?p=24642"},"modified":"2025-10-28T12:30:11","modified_gmt":"2025-10-28T11:30:11","slug":"analyse-des-mecanismes-dintensification-du-melange-et-des-transferts-thermiques-par-combinaison-de-methodes-passives-dans-des-ecoulements-internes-tubulaires-application-aux-reacteurs-chimi","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/analyse-des-mecanismes-dintensification-du-melange-et-des-transferts-thermiques-par-combinaison-de-methodes-passives-dans-des-ecoulements-internes-tubulaires-application-aux-reacteurs-chimi\/","title":{"rendered":"Analysis of mixing and heat transfer intensification mechanisms by combining passive methods in tubular internal flows : application continuous chemical reactors and solar collectors"},"content":{"rendered":"<strong><span style=\"text-decoration: underline;\">Summary:<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">The energy efficiency of thermal components and systems, as well as the improvement and development of new technologies, are major challenges today. In this general context, the work of this thesis is aimed at improving the thermal performance and mixing of multifunctional heat exchanger-reactors, which are more than ever key components. To achieve this goal, a passive intensification technique has been explored, involving the application of two types of macro-wall deformations on the walls of a laminar flow annular tube. The study initially focused on characterizing the secondary flows created by each of the deformations applied separately in order to enhance heat transfer.Subsequently, a combination of successive and alternating radial deformations on the outer wall, coupled with a geometry that induces swirl motion on the inner wall, significantly increased mixing by promoting chaotic advection within the flow. The understanding of the underlying physical mechanisms relied on numerical analysis of local thermal and hydraulic fields, identification of vortical structures, Poincar\u00e9 sections, as well as the determination of thermo-hydraulic and mixing performance at both global and local levels. An experimental evaluation of hydraulic behavior was also conducted using the residence time distribution method, partially validating the chosen numerical model in this study. Finally, the last part of the study was dedicated to the application of the intensification concepts studied to the case of a concentrated solar thermal collector.<\/p>\n<table border=\"1\" width=\"100%\">\n<tbody>\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Feriel YAHIAT<\/td>\n<\/tr>\n<tr>\n<td><strong>Date of presentation<\/strong><\/td>\n<\/tr>\n<tr>\n<td>2023, september 28th<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Improvement of mixing quality, Enhancement of thermo-hydraulic performance, Numerical simulations, Laminar flow, Wall macro-deformations<\/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\u2019efficacit\u00e9 \u00e9nerg\u00e9tique des composants et syst\u00e8mes thermiques, l\u2019am\u00e9lioration et le d\u00e9veloppement de nouvelles technologies sont des enjeux majeurs aujourd\u2019hui. Dans ce contexte g\u00e9n\u00e9ral, les travaux de cette th\u00e8se s\u2019inscrivent dans une perspective d\u2019am\u00e9lioration des performances thermiques et de m\u00e9lange d\u2019\u00e9changeurs-r\u00e9acteurs multifonctionnels qui, plus que jamais, sont des composants cl\u00e9s. Pour atteindre cet objectif, une technique d&#8217;intensification passive a \u00e9t\u00e9 explor\u00e9e.<\/p>","protected":false},"author":1,"featured_media":966,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[20,21],"tags":[6936,6937,6939,6938,6783],"class_list":["post-24642","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses","tag-amelioration-de-la-qualite-du-melange","tag-intensifiaction-des-performances-thermo-hydrauliques","tag-macro-deformations-parietales","tag-regime-laminaire","tag-simulations-numeriques"],"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>Analyse des m\u00e9canismes d\u2019intensification du m\u00e9lange et des transferts thermiques par combinaison de m\u00e9thodes passives dans des \u00e9coulements internes tubulaires : application aux r\u00e9acteurs chimiques continus et aux capteurs solaires - 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\/analyse-des-mecanismes-dintensification-du-melange-et-des-transferts-thermiques-par-combinaison-de-methodes-passives-dans-des-ecoulements-internes-tubulaires-application-aux-reacteurs-chimi\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Analyse des m\u00e9canismes d\u2019intensification du m\u00e9lange et des transferts thermiques par combinaison de m\u00e9thodes passives dans des \u00e9coulements internes tubulaires : application aux r\u00e9acteurs chimiques continus et aux capteurs solaires\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : L\u2019efficacit\u00e9 \u00e9nerg\u00e9tique des composants et syst\u00e8mes thermiques, l\u2019am\u00e9lioration et le d\u00e9veloppement de nouvelles technologies sont des enjeux majeurs aujourd\u2019hui. Dans ce contexte g\u00e9n\u00e9ral, les travaux de cette th\u00e8se s\u2019inscrivent dans une perspective d\u2019am\u00e9lioration des performances thermiques et de m\u00e9lange d\u2019\u00e9changeurs-r\u00e9acteurs multifonctionnels qui, plus que jamais, sont des composants cl\u00e9s. Pour atteindre cet objectif, une technique d&#039;intensification passive a \u00e9t\u00e9 explor\u00e9e.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/greth.fr\/en\/analyse-des-mecanismes-dintensification-du-melange-et-des-transferts-thermiques-par-combinaison-de-methodes-passives-dans-des-ecoulements-internes-tubulaires-application-aux-reacteurs-chimi\/\" \/>\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=\"2025-10-27T11:00:07+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-28T11:30:11+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-10.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"424\" \/>\n\t<meta property=\"og:image:height\" content=\"283\" 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