{"id":168425,"date":"2022-04-12T21:33:00","date_gmt":"2022-04-12T21:33:00","guid":{"rendered":"\/forum\/forums\/topic\/multiphase-mixture-model-mass-conservation-not-obeyed\/"},"modified":"2022-04-25T07:15:16","modified_gmt":"2022-04-25T07:15:16","slug":"multiphase-mixture-model-mass-conservation-not-obeyed","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/multiphase-mixture-model-mass-conservation-not-obeyed\/","title":{"rendered":"Multiphase mixture model mass conservation not obeyed"},"content":{"rendered":"
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Hi All,<\/p>\n

I am modeling a two-phase problem with interfacial species mass transfer in a closed domain rectangular domain with impermeable BC & zero diffusive flux on all the walls. <\/p>\n

Model: Mixture model for two phase. Species mass transfer for mass transfer mechanism.<\/p>\n

Issues:<\/p>\n

The mass of Vapor co2 = 2.5e-7g and Liquid ethanol = 2.9e-7g. Initial total mass = 5.4e-7g<\/p>\n

Vapor co2 converts into liquid co2 via dissolution and goes into the liquid phase. So, in this system the total mass of the liquid increases while the vapor phase decreases. After I ran the simulation to steady-state I calculated the mass of the liquid, vapor and species to see if the mass was conserved. I expect the total mass to be the same (remember domain is closed). <\/p>\n

At steady state, Mass of liquid co2 = 1.3e-7g<\/strong>, mass of liquid etoh = 3.45e-7g<\/strong> and mass of vapor co2 is 2.45e-7g. Final total mass = 7.2e-7g. Not equal to 5.47g<\/strong><\/p>\n

Total mass in the system increased. Another strange observation is that the mass of liquid Etoh increased too. I expected that to remain the same because the only mass transfer in the system is due to dissolution of vapor co2. <\/p>\n

Please, what could be the reason behind this mass imbalance. Seems my system is gaining mass. Could I be doing something wrong. Any advise? asides from refining the mesh. <\/p>\n

@Rob<\/a> @DrAmine<\/a> @Kremella<\/a> <\/p>\n

Regards,<\/p>\n

Friday<\/p>\n","protected":false},"template":"","class_list":["post-168425","topic","type-topic","status-closed","hentry","topic-tag-fluent","topic-tag-massconservationcheck","topic-tag-mutiphase-1","topic-tag-species-mass-transfer-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_btv_view_count":["653"],"_bbp_likes_count":["0"],"_bbp_subscription":["73763"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["168425"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","22555","73763"],"_bbp_voice_count":["3"],"_bbp_reply_count":["9"],"_bbp_last_reply_id":["211637"],"_bbp_last_active_id":["211637"],"_bbp_last_active_time":["2022-04-25 07:15:16"]},"test":"friday-abolorunketufts-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/168425","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\/168425\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=168425"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}