{"id":292987,"date":"2023-07-13T19:18:04","date_gmt":"2023-07-13T19:18:04","guid":{"rendered":"\/forum\/forums\/topic\/gas-liquid-mass-transfer-source-term-co2-transfer-from-gas-to-liquid-water\/"},"modified":"2023-07-14T06:40:10","modified_gmt":"2023-07-14T06:40:10","slug":"gas-liquid-mass-transfer-source-term-co2-transfer-from-gas-to-liquid-water","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/gas-liquid-mass-transfer-source-term-co2-transfer-from-gas-to-liquid-water\/","title":{"rendered":"Gas-Liquid Mass Transfer Source Term (CO2 transfer from gas to Liquid water)"},"content":{"rendered":"

Dear Experts,<\/p>\n

Your help is needed again<\/em> to clearify a doubt in unit of source term of gas-liquid mass transfer. Requesting your attention.<\/p>\n

\/*****Problem description*****\/           <\/strong><\/p>\n

Transfer of CO2 from gas mixture (CO2+O2+N2) to liquid mixture (CO2+H2O). <\/strong><\/p>\n

Species transport equation in multiphase flow (ref. fluent theory guide)<\/p>\n

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

Unit of first term in this equation<\/strong> <\/p>\n

 <\/a><\/p>\n

Therefore, Unit for every term in the species transport equation should be the same, i.e., mass of the transferring species per unit cell volume per unit time<\/em><\/p>\n

Now, Let’s look at the last term: From the literature it has the following form using Henry’s law:<\/strong><\/p>\n

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

In this k<\/em><\/strong> is mass transfer coefficient (m\/s), a<\/em><\/strong> is area density (1\/m) and He<\/em><\/strong> is unit less Henry’s constant.<\/p>\n

Therefore, the unit of mass transfer rate term can be computed as:<\/p>\n

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

Which is similar to <\/p>\n

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

My doubt<\/strong>– Unit of mass transfer rate, calculated in this way, is not simiilar to the unit of first term. In first term denominator has “cell volume” while in mass transfer rate “phase volume” appears in the denominator. <\/p>\n

Question:<\/strong> Can anyone tell me if the mass transfer rate calculated from the above formula is correct. Or should it involve phase volume fraction also ? For example, it should have a form like <\/p>\n

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

<\/p>\n

I have written the following two code line in the DEFINE_MASS_TRANSFER<\/strong> udf <\/p>\n

According to formula-1-><\/strong>   <\/p>\n

k*a*(He*C_R(cell,gas)*C_YI(cell,gas,0)-C_R(cell,liq)*C_YI(cell,liq,0));<\/p>\n

According to formula-2-><\/strong>  <\/p>\n

k*a*(He*C_R(cell,gas)*C_YI(cell,gas,0)*C_VOF(cell,gas)-C_R(cell,liq)*C_YI(cell,liq,0)*C_VOF(cell,liq));<\/p>\n

Kindly suggest which of the above code will give me correct gas-liquid mass transfer rate?<\/strong><\/p>\n","protected":false},"template":"","class_list":["post-292987","topic","type-topic","status-closed","hentry","topic-tag-fluent","topic-tag-Interphasemasstransfer-1","topic-tag-multiphase-eulerian","topic-tag-o2-mass-fraction-1","topic-tag-species-mass-transfer-2"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["184434","852","199"],"_bbp_author_ip":["23.223.149.206"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["1351"],"_edit_lock":["1689316813:69626"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["292987"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","852","184434"],"_bbp_voice_count":["3"],"_bbp_reply_count":["8"],"_bbp_last_reply_id":["296179"],"_bbp_last_active_id":["296179"],"_bbp_last_active_time":["2023-08-02 18:47:04"]},"test":"kavatar"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/292987","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\/292987\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=292987"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}