{"id":159263,"date":"2021-06-08T04:25:43","date_gmt":"2021-06-08T04:25:43","guid":{"rendered":"\/forum\/forums\/topic\/how-to-model-convective-heat-transfer-on-a-two-sided-wall\/"},"modified":"2021-06-09T13:51:12","modified_gmt":"2021-06-09T13:51:12","slug":"how-to-model-convective-heat-transfer-on-a-two-sided-wall","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-model-convective-heat-transfer-on-a-two-sided-wall\/","title":{"rendered":"How to model convective heat transfer on a two-sided wall"},"content":{"rendered":"
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Hi everyone.<\/p>\n

I am working on a simulation which involves a cold volume of liquid in a plastic container being placed in an ambient air environment, and the goal is to determine when the center of the liquid heats up to a certain degree. The plastic container is very thin, and I modeled it as a shell and applied shell conduction to it. Otherwise, the only method of heat transfer is by natural convection. <\/p>\n

My set-up involves a larger enclosure around the bag of liquid, which represents the ambient air. The volume of liquid is completely enclosed by the plastic container, which is an elliptical cylinder. <\/p>\n

I am having trouble figuring out how to properly apply convection to the volume of liquid. I have tried applying a convection boundary condition to the outer walls of the ambient environment, but the results remain the same no matter what I set the heat transfer coefficient as (I tried anywhere from 0.5 to 500 w\/m^2 K). Since the plastic container is a two-sided wall I cannot apply a convective boundary condition to it, so I have it set as a coupled wall. <\/p>\n

Another method I tried was by applying a temperature boundary condition to the walls of the ambient air enclosure, then using the "Patch" feature (in the initialization step) to set the enclosure at a constant temperature. In the material properties for the liquid that is inside the plastic container, I set the density as "boussinesq" since the overall temperature change I am dealing with is small (ambient environment is 23C, volume of liquid starts at 5C). I am unsure if this method actually simulates convection or not. Or, is there a better way to go about doing this?<\/p>\n

It is important to note that a physical experiment was performed, and my simulation is about 25-30% off from the physical experiment. <\/p>\n

<\/p>\n<\/p>\n

Thanks in advance!<\/p>\n","protected":false},"template":"","class_list":["post-159263","topic","type-topic","status-closed","hentry","topic-tag-fluent","topic-tag-natural-convection"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_author_ip":[""],"_bbp_old_reply_author_name_id":["Anonymous"],"_bbp_old_is_reply_anonymous_id":["false"],"_btv_view_count":["2028"],"_bbp_likes_count":["0"],"_bbp_subscription":["238209"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["159263"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","198222"],"_bbp_voice_count":["2"],"_bbp_reply_count":["7"],"_bbp_last_reply_id":["181399"],"_bbp_last_active_id":["181399"],"_bbp_last_active_time":["2021-06-09 13:51:12"]},"test":"dodonn4uic-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/159263","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\/159263\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=159263"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}