{"id":27656,"date":"2026-05-19T11:00:29","date_gmt":"2026-05-19T09:00:29","guid":{"rendered":"https:\/\/greth.fr\/?p=27656"},"modified":"2026-05-19T11:25:25","modified_gmt":"2026-05-19T09:25:25","slug":"dosage-en-eau-pour-le-refroidissement-evaporatif-etude-du-bouchage-dechangeur-de-chaleur-et-de-la-mouillabilite-des-films-deau","status":"publish","type":"post","link":"https:\/\/greth.fr\/en\/dosage-en-eau-pour-le-refroidissement-evaporatif-etude-du-bouchage-dechangeur-de-chaleur-et-de-la-mouillabilite-des-films-deau\/","title":{"rendered":"Water dosage for evaporative cooling : study of heat exchanger clogging and wettability of water films"},"content":{"rendered":"<strong><span style=\"text-decoration: underline;\">Summary:<\/span><\/strong><\/p>\n<p style=\"text-align: justify;\">In the refrigeration sector, improving the energy efficiency of heat exchangers is a major challenge. Among the methods studied, spraying water directly onto the exchangers appears to be an effective strategy for enhancing heat transfer through evaporative cooling. However, when applied to complex geometries such as fins, the sprayed water does not evaporate instantly and instead accumulates locally by coalescence in the form of thick films. This clogging phenomenon blocks the gaps available for air circulation, which greatly degrades overall thermal performance. This thesis focuses specifically on these obstruction mechanisms as well as the effect of wettability properties on heat transfer, with the aim of identifying solutions that improve cooling performance while optimizing water consumption. The first part is devoted to the study of clogging. Experiments carried out with metallic grids placed in the spray cone showed that the mesh geometry plays a decisive role. Large meshes limit obstruction, whereas meshes smaller than the capillary length promote film spreading and the formation of water films that block air flow. Numerical simulations confirmed the progressive formation of interconnected films around the meshes, reproducing the clogging phenomenon. To better understand the physical mechanisms involved, a simplified study was then conducted on a single droplet confined between two fins, representing the post-coalescence state. Three main parameters were identified: the Bond number Bo, the aspect ratio L\/D between the channel width and the droplet diameter, and the contact angle. The results show that hydrophilic surfaces promote the entry of small droplets into the channels due to capillary forces but prevent their evacuation, increasing the risk of persistent obstruction. In contrast, hydrophobic surfaces prevent liquid entry but facilitate its removal. Large droplets with large Bo and small L\/D deform and break up at the channel entrance, which disrupts their transport and promotes blockage. Conversely, droplets of a size comparable to that of the channel do not fragment and are more easily evacuated. The second part deals with surface wettability and its role in cooling by liquid film under small spraying flow rates, in order to promote low water consumption. On hydrophobic surfaces, water forms isolated droplets that slide rapidly; liquid\/wall thermal contact is limited, and mainly convective heat transfer remains weak. On surfaces with intermediate wettability, droplets coalesce and form a continuous film, convective exchange increases, and cooling improves with water flow rate. On hydrophilic surfaces, the film is well spread and thin, especially in lateral areas, which intensifies evaporation and improves thermal efficiency even at small flow rates. However, part of the liquid may stagnate without actively participating in heat exchange. Two heat transfer regimes were identified: a predominantly evaporative regime at very small flow rates and a mixed convection\/evaporation regime when the flow rate increases. Water flow must therefore be sufficient to avoid surface drying and to promote evaporation. Measurements of film thickness, flow velocity and dissipated heat flux helped relate wettability to thermal efficiency, while providing reference data for the validation of numerical models of thin film flows.<\/p>\n<table border=\"1\" width=\"100%\">\n<tbody>\n<tr>\n<td><strong>Author<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Damien THOMAS<\/td>\n<\/tr>\n<tr>\n<td><strong>Date of presentation<\/strong><\/td>\n<\/tr>\n<tr>\n<td>2025, december 16th<\/td>\n<\/tr>\n<tr>\n<td><strong>Keywords<\/strong><\/td>\n<\/tr>\n<tr>\n<td>Water dosage, Volume Of Fluid (VOF) method, Channel clogging, Wettability, Droplets dynamic, Evaporative cooling of a heat source<\/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 : Dans le secteur de la r\u00e9frig\u00e9ration, l&#8217;am\u00e9lioration de l&#8217;efficacit\u00e9 \u00e9nerg\u00e9tique des \u00e9changeurs de chaleur constitue un enjeu majeur. Parmi les m\u00e9thodes \u00e9tudi\u00e9es, la pulv\u00e9risation d&#8217;eau directement sur les \u00e9changeurs appara\u00eet comme une strat\u00e9gie efficace pour renforcer les transferts thermiques gr\u00e2ce au refroidissement \u00e9vaporatif. Cependant, lorsqu&#8217;elle est appliqu\u00e9e sur des g\u00e9om\u00e9tries complexes comme les ailettes, l&#8217;eau pulv\u00e9ris\u00e9e ne s&#8217;\u00e9vapore pas instantan\u00e9ment et s&#8217;accumule par coalescence localement sous forme de films \u00e9pais. Ce ph\u00e9nom\u00e8ne de bouchage obstrue les interstices disponibles pour la circulation de l&#8217;air, ce qui d\u00e9grade fortement les performances thermiques globales. Cette th\u00e8se s&#8217;int\u00e9resse pr\u00e9cis\u00e9ment \u00e0 ces m\u00e9canismes d&#8217;obstruction ainsi qu&#8217;\u00e0 l&#8217;effet des propri\u00e9t\u00e9s de mouillabilit\u00e9 sur les transferts thermiques, afin d&#8217;identifier des solutions permettant d&#8217;am\u00e9liorer les performances de refroidissement tout en optimisant le dosage en eau. La premi\u00e8re partie est consacr\u00e9e \u00e0 l&#8217;\u00e9tude du bouchage.<\/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":[6980,6984,6981,6983,6982,6985],"class_list":["post-27656","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-documents","category-memoires-theses","tag-dosage-de-leau","tag-dynamique-de-gouttes","tag-methode-volume-of-fluid-vof","tag-mouillabilite","tag-obstruction-de-canaux","tag-refroidissement-evaporatif-dune-source-de-chaleur"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.9 (Yoast SEO v27.6) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Dosage en eau pour le refroidissement \u00e9vaporatif : \u00e9tude du bouchage d&#039;\u00e9changeur de chaleur et de la mouillabilit\u00e9 des films d&#039;eau - 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\/dosage-en-eau-pour-le-refroidissement-evaporatif-etude-du-bouchage-dechangeur-de-chaleur-et-de-la-mouillabilite-des-films-deau\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Dosage en eau pour le refroidissement \u00e9vaporatif : \u00e9tude du bouchage d&#039;\u00e9changeur de chaleur et de la mouillabilit\u00e9 des films d&#039;eau\" \/>\n<meta property=\"og:description\" content=\"R\u00e9sum\u00e9 : Dans le secteur de la r\u00e9frig\u00e9ration, l&#039;am\u00e9lioration de l&#039;efficacit\u00e9 \u00e9nerg\u00e9tique des \u00e9changeurs de chaleur constitue un enjeu majeur. Parmi les m\u00e9thodes \u00e9tudi\u00e9es, la pulv\u00e9risation d&#039;eau directement sur les \u00e9changeurs appara\u00eet comme une strat\u00e9gie efficace pour renforcer les transferts thermiques gr\u00e2ce au refroidissement \u00e9vaporatif. Cependant, lorsqu&#039;elle est appliqu\u00e9e sur des g\u00e9om\u00e9tries complexes comme les ailettes, l&#039;eau pulv\u00e9ris\u00e9e ne s&#039;\u00e9vapore pas instantan\u00e9ment et s&#039;accumule par coalescence localement sous forme de films \u00e9pais. Ce ph\u00e9nom\u00e8ne de bouchage obstrue les interstices disponibles pour la circulation de l&#039;air, ce qui d\u00e9grade fortement les performances thermiques globales. Cette th\u00e8se s&#039;int\u00e9resse pr\u00e9cis\u00e9ment \u00e0 ces m\u00e9canismes d&#039;obstruction ainsi qu&#039;\u00e0 l&#039;effet des propri\u00e9t\u00e9s de mouillabilit\u00e9 sur les transferts thermiques, afin d&#039;identifier des solutions permettant d&#039;am\u00e9liorer les performances de refroidissement tout en optimisant le dosage en eau. La premi\u00e8re partie est consacr\u00e9e \u00e0 l&#039;\u00e9tude du bouchage.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/greth.fr\/en\/dosage-en-eau-pour-le-refroidissement-evaporatif-etude-du-bouchage-dechangeur-de-chaleur-et-de-la-mouillabilite-des-films-deau\/\" \/>\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=\"2026-05-19T09:00:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-05-19T09:25:25+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/greth.fr\/wp-content\/uploads\/2015\/08\/theses-5.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"424\" \/>\n\t<meta property=\"og:image:height\" content=\"283\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" 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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\/dosage-en-eau-pour-le-refroidissement-evaporatif-etude-du-bouchage-dechangeur-de-chaleur-et-de-la-mouillabilite-des-films-deau\/","og_locale":"en_US","og_type":"article","og_title":"Dosage en eau pour le refroidissement \u00e9vaporatif : \u00e9tude du bouchage d'\u00e9changeur de chaleur et de la mouillabilit\u00e9 des films d'eau","og_description":"R\u00e9sum\u00e9 : Dans le secteur de la r\u00e9frig\u00e9ration, l'am\u00e9lioration de l'efficacit\u00e9 \u00e9nerg\u00e9tique des \u00e9changeurs de chaleur constitue un enjeu majeur. Parmi les m\u00e9thodes \u00e9tudi\u00e9es, la pulv\u00e9risation d'eau directement sur les \u00e9changeurs appara\u00eet comme une strat\u00e9gie efficace pour renforcer les transferts thermiques gr\u00e2ce au refroidissement \u00e9vaporatif. Cependant, lorsqu'elle est appliqu\u00e9e sur des g\u00e9om\u00e9tries complexes comme les ailettes, l'eau pulv\u00e9ris\u00e9e ne s'\u00e9vapore pas instantan\u00e9ment et s'accumule par coalescence localement sous forme de films \u00e9pais. Ce ph\u00e9nom\u00e8ne de bouchage obstrue les interstices disponibles pour la circulation de l'air, ce qui d\u00e9grade fortement les performances thermiques globales. Cette th\u00e8se s'int\u00e9resse pr\u00e9cis\u00e9ment \u00e0 ces m\u00e9canismes d'obstruction ainsi qu'\u00e0 l'effet des propri\u00e9t\u00e9s de mouillabilit\u00e9 sur les transferts thermiques, afin d'identifier des solutions permettant d'am\u00e9liorer les performances de refroidissement tout en optimisant le dosage en eau. 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