


{"id":357595,"date":"2024-03-18T11:54:07","date_gmt":"2024-03-18T11:54:07","guid":{"rendered":"\/forum\/forums\/topic\/under-low-velocity-there-is-difference-between-hand-calculation-and-simulation\/"},"modified":"2024-03-18T11:54:07","modified_gmt":"2024-03-18T11:54:07","slug":"under-low-velocity-there-is-difference-between-hand-calculation-and-simulation","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/under-low-velocity-there-is-difference-between-hand-calculation-and-simulation\/","title":{"rendered":"Under low velocity, there is difference between hand calculation and simulation"},"content":{"rendered":"<p>The simulation model is a simple jacketed tube model.<\/p>\n<p><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/18-03-2024-1710762554-mceclip0.png\"><\/p>\n<p>The flowing fluid is air, which is available in fluent by default, and the jacket material is aluminum which is modified the thermal conductivity of the initial aluminum to 1e-5 W\/m K.<\/p>\n<p>The inlet is set as mass flow inlet (4.02577e-9 kg\/s, 26.8 K) (velocity is about 4e-5 m\/s) and the outlet is pressure outlet.<\/p>\n<p>The boundary temperature of tube is set as 300 K.<\/p>\n<p>The flow state in the tube is laminar.<\/p>\n<p>The calculations all converged, but the gas heat absorption (m cp T), calculated from the temperature difference between the inlet and outlet, is in significant error(about 200%~300%) from that calculated from the intrusion of heat flux at the tube wall (q&#8221; A).<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"template":"","class_list":["post-357595","topic","type-topic","status-closed","hentry","topic-tag-fluent"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["341599","13659"],"_bbp_author_ip":["96.7.218.223"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["198"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["357595"],"_bbp_forum_id":["27792"],"_bbp_engagement":["13659","341599"],"_bbp_voice_count":["2"],"_bbp_reply_count":["3"],"_bbp_last_reply_id":["357641"],"_bbp_last_active_id":["357641"],"_bbp_last_active_time":["2024-03-18 13:51:17"]},"test":"zhuxianyou1999gmail-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/357595","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\/357595\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=357595"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}