{"id":54247,"date":"2021-04-14T03:09:54","date_gmt":"2021-04-14T03:09:54","guid":{"rendered":"\/forum\/forums\/topic\/inaccurate-heat-transfer-between-fluids\/"},"modified":"2021-04-14T03:09:54","modified_gmt":"2021-04-14T03:09:54","slug":"inaccurate-heat-transfer-between-fluids","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/inaccurate-heat-transfer-between-fluids\/","title":{"rendered":"Inaccurate heat transfer between fluids"},"content":{"rendered":"<div class=\"Item-Body\">\n<div class=\"Message userContent\">\n<p>Hi, <\/p>\n<p>I am running a CFD simulation on the exhaust gas system for Micro CHP. The design I am working on functions mainly as the muffler for the exhaust gas, but also as a secondary heat exchanger. It consists of a double pipe, with exhaust gas flowing in the inner pipe and coolant-water-mixture flowing in the cavity between the inner pipe and outer pipe.<\/p>\n<p>My model is basically just 2 fluid domains in contact with each other, with coupled thin wall in between them. I am using realizable k-epsilon model with scalable wall function. Energy is on, species transport is also on, with default setting. I didnt change any of the properties of the material other than mixing the coolant-water-mixture in mixture template(leaving everything as default). I am using mass-flow-inlet for both the inlet and pressure outlet for both the outlet. Here are the screenshots of each inlet and outlet.<\/p>\n<div class=\"embedExternal embedImage\">\n<div class=\"embedExternal-content\">\n<a class=\"embedImage-link\" href=\"\/forum\/wp-content\/uploads\/forum-uploads\/929\/S3ZJBUUK237E.png\" rel=\"nofollow noopener\" target=\"_blank\"><br \/>\n<img decoding=\"async\" class=\"embedImage-img\" src=\"\/forum\/wp-content\/uploads\/forum-uploads\/929\/S3ZJBUUK237E.png\" alt=\"image.png\" \/><br \/>\n<\/a><\/p>\n","protected":false},"template":"","class_list":["post-54247","topic","type-topic","status-closed","hentry","topic-tag-boundary-conditions","topic-tag-fluent","topic-tag-heat-exchanger","topic-tag-mixture-of-material"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["26577"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["\u001f\u0011?\u001b"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1157"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["54247"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","187078"],"_bbp_voice_count":["3"],"_bbp_reply_count":["9"],"_bbp_last_reply_id":["149894"],"_bbp_last_active_id":["149894"],"_bbp_last_active_time":["2021-04-19 09:29:17"]},"test":"danielgkh"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/54247","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/54247\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=54247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}