{"id":51691,"date":"2021-01-28T12:56:53","date_gmt":"2021-01-28T12:56:53","guid":{"rendered":"\/forum\/forums\/topic\/should-emissivity-and-diffuse-fraction-be-set-on-both-wall-and-wall-shadow-or-just-one-of-them\/"},"modified":"2021-01-28T12:56:53","modified_gmt":"2021-01-28T12:56:53","slug":"should-emissivity-and-diffuse-fraction-be-set-on-both-wall-and-wall-shadow-or-just-one-of-them","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/should-emissivity-and-diffuse-fraction-be-set-on-both-wall-and-wall-shadow-or-just-one-of-them\/","title":{"rendered":"Should emissivity and diffuse-fraction be set on both wall and wall-shadow or just one of them?"},"content":{"rendered":"<p>I am using Fluent DO radiation model to simulate an electric baking oven containing:nAn electric heater (radiation source)nA reflector (specular from one side and diffuse from the other with no coating)nA baking plate (opaque diffuse wall with no coating)nOven walls (opaque diffuse wall with no coating)nIt is not clear to me how should radiative properties be set on the wall and the wall-shadow:nShould both of them have the same emissivity and diffuse-fraction or different?nIf they should be the same, does that mean the energy from radiation will be absorbed\/reflected\/transmitted by both? nCould it happen for example that rays keep reflecting between the wall and its shadow? (which is not wanted here)nIf they should be different then how to know which wall to set because sometimes I find the momentum tab enabled for the wall and some other times it will be enabled for the wall-shadow, which again confuses me which one is the solid side and which one is the fluid side?nShould I make the fluid side transparent and the solid side opaque? if yes then how?nPlease advise.nThank you.n<\/p>\n","protected":false},"template":"","class_list":["post-51691","topic","type-topic","status-closed","hentry","topic-tag-do-radiation-model","topic-tag-emissivity","topic-tag-shadow","topic-tag-wall-boundary-condition","topic-tag-wall-shadow"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["23964"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":["%\u0004??"],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["2556"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["51691"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","165074"],"_bbp_voice_count":["2"],"_bbp_reply_count":["6"],"_bbp_last_reply_id":["140345"],"_bbp_last_active_id":["140345"],"_bbp_last_active_time":["2021-01-28 15:16:19"]},"test":"mmoataz"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/51691","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\/51691\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=51691"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}