{"id":36554,"date":"2019-07-15T09:37:55","date_gmt":"2019-07-15T09:37:55","guid":{"rendered":"\/forum\/forums\/topic\/problems-of-heat-source-and-coefficient-of-free-convection\/"},"modified":"2019-07-15T09:37:55","modified_gmt":"2019-07-15T09:37:55","slug":"problems-of-heat-source-and-coefficient-of-free-convection","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/problems-of-heat-source-and-coefficient-of-free-convection\/","title":{"rendered":"Problems of Heat Source and Coefficient of Free Convection"},"content":{"rendered":"<p>Hi everyone,<\/p>\n<p><\/p>\n<p>I was trying to solve a steady-state&nbsp;temperature distribution&nbsp;problem in ANSYS Workbench 17.2.&nbsp;<\/p>\n<p><\/p>\n<p>However, there are some confusing definitions that I am facing:<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>1. Assume <strong>heat flow =&nbsp;Q (W)<\/strong> and the subjected <strong>area = A (m^2)<\/strong><\/p>\n<p><\/p>\n<p>I was wondering what&#8217;s the difference between applying a &#8220;Heat flow (Q)&#8221; and applying a &#8220;Heat flux (Q\/A)&#8221; on the same surface since I found that the temperature distribution by applying the two method above were different.<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>2. If a body part was heated uniformly by a external heat source, how can I apply this kind of boundary condition?<\/p>\n<p><\/p>\n<p>I&#8217;ve tried to use the internal heat generation option but the result was not even close to the theoretical solution.<\/p>\n<p><\/p>\n<p>The way I applied the heat generation is taking the heat flow value over the volume of subjected body.<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>3. As I realized, the <strong>coefficient of free convection in air<\/strong> surrounding,h (W\/m^2-C) ,can be obtained by using empirical formula.<\/p>\n<p><\/p>\n<p>If the result from simulation of free convection is not as good as expectation, is that reasonable to enlarge the value of h?<\/p>\n<p><\/p>\n<p>If so, what&#8217;s the limitation of increment ( like h should be lower than 25 or something)?<\/p>\n<p><\/p>\n<p>&nbsp;<\/p>\n<p><\/p>\n<p>Any suggestion would be appreciated, thank you!<\/p>\n","protected":false},"template":"","class_list":["post-36554","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["8726"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0","0"],"_btv_view_count":["471"],"_bbp_subscription":["240992"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["36554"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","166324"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["90140"],"_bbp_last_active_id":["90140"],"_bbp_last_active_time":["2019-07-22 11:12:57"]},"test":"annayang"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/36554","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\/36554\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=36554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}