Pr Christian Ruyer-Quil<\/a> sur l’instabilit\u00e9 interfaciale dans les \u00e9coulements de films minces, r\u00e9sultant des ondulations du substrat. L’\u00e9tude vise \u00e0 d\u00e9velopper un mod\u00e8le d’\u00e9coulement de film tombant sur une topographie, bas\u00e9 sur la m\u00e9thode des r\u00e9sidus pond\u00e9r\u00e9s (WRM), qui rendra compte de l’apparition de plaque s\u00e8ches dans des conditions de mouillage partiel. L’apparition de plaques s\u00e8ches est une limitation \u00e9vidente de l’efficacit\u00e9 des \u00e9changeurs de chaleur impliquant des films tombants. En outre, les h\u00e9t\u00e9rog\u00e9n\u00e9it\u00e9s chimiques ou la rugosit\u00e9 de la surface g\u00e9n\u00e8rent une hyst\u00e9r\u00e9sis de l’angle de contact et donc des forces d’adh\u00e9sion qui peuvent emp\u00eacher les petites gouttelettes de s’\u00e9couler et donc affecter la fraction de la paroi couverte par le film liquide. Les formulations en 1D et 2D seront r\u00e9solues sur une grille cart\u00e9sienne avec des conditions aux limites p\u00e9riodiques. La partie conservative des \u00e9quations sera trait\u00e9e \u00e0 l’aide de la m\u00e9thode des volumes finis, tandis que les termes de diffusion g\u00e9n\u00e9ralis\u00e9e de la tension de surface seront trait\u00e9s par diff\u00e9rences finies.<\/p>\nDr. Geetanjali Chattopadhyay is at LOCIE to carry out theoretical and numerical research work on the interfacial instability in thin film flows, resulting from the substrate undulations. The study aims to develop a model for falling film flow over topography based on the weighted residual method (WRM) which will account for the onset of dry patches in partial wetting conditions. The onset of dry patches is a clear limitation to the efficiency of heat exchangers involving falling films on plates. In addition, chemical heterogeneities, or surface roughness generates contact angle hysteresis and thus adhesion forces that may prevent small droplets from flowing and thus affect the fraction of the wall covered by the liquid film. Formulations in 1D and 2D will be solved on a Cartesian grid with periodic boundary conditions. The conservative part of the equations will be treated using the finite volume method, whereas surface tension generalized diffusion terms will be treated by finite differences.<\/em><\/p>\n <\/p>\n
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Dr Geetanjali Chattopadhyay est chercheuse invit\u00e9e au LOCIE de septembre 2023 \u00e0 mars 2024 dans le cadre de la bourse SERB International Research Experience (SIRE) du gouvernement indien. Dr. Geetanjali Chattopadhyay is visiting LOCIE from […]<\/p>\n","protected":false},"author":141,"featured_media":66,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_seopress_titles_title":"","_seopress_titles_desc":"","_seopress_robots_index":"","_seopress_robots_follow":"","_seopress_robots_imageindex":"","_seopress_robots_snippet":"","_seopress_robots_primary_cat":"none","_seopress_robots_breadcrumbs":"","_seopress_robots_freeze_modified_date":"","_seopress_robots_custom_modified_date":"","_seopress_robots_canonical":"","_seopress_social_fb_title":"","_seopress_social_fb_desc":"","_seopress_social_fb_img":"","_seopress_social_fb_img_attachment_id":0,"_seopress_social_fb_img_width":0,"_seopress_social_fb_img_height":0,"_seopress_social_twitter_title":"","_seopress_social_twitter_desc":"","_seopress_social_twitter_img":"","_seopress_social_twitter_img_attachment_id":0,"_seopress_social_twitter_img_width":0,"_seopress_social_twitter_img_height":0,"_seopress_redirections_value":"","_seopress_redirections_enabled":"","_seopress_redirections_enabled_regex":"","_seopress_redirections_logged_status":"both","_seopress_redirections_param":"","_seopress_redirections_type":301,"_seopress_analysis_target_kw":"","_seopress_news_disabled":"","_seopress_video_disabled":"","_seopress_video":[],"_seopress_pro_schemas_manual":[],"_seopress_pro_rich_snippets_disable_all":"","_seopress_pro_rich_snippets_disable":[],"_seopress_pro_schemas":[],"_relevanssi_hide_post":"","_relevanssi_hide_content":"","_relevanssi_pin_for_all":"","_relevanssi_pin_keywords":"","_relevanssi_unpin_keywords":"","_relevanssi_related_keywords":"","_relevanssi_related_include_ids":"","_relevanssi_related_exclude_ids":"","_relevanssi_related_no_append":"","_relevanssi_related_not_related":"","_relevanssi_related_posts":"","_relevanssi_noindex_reason":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[18,35,9],"tags":[],"class_list":["post-14859","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-a-la-une","category-evenements","category-non-classe-fr"],"acf":[],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/www.univ-smb.fr\/locie\/wp-content\/uploads\/sites\/72\/2018\/03\/eve.jpg","_links":{"self":[{"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/posts\/14859","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/users\/141"}],"replies":[{"embeddable":true,"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/comments?post=14859"}],"version-history":[{"count":5,"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/posts\/14859\/revisions"}],"predecessor-version":[{"id":14891,"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/posts\/14859\/revisions\/14891"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/media\/66"}],"wp:attachment":[{"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/media?parent=14859"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/categories?post=14859"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.univ-smb.fr\/locie\/wp-json\/wp\/v2\/tags?post=14859"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
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