{"id":166220,"date":"2023-03-17T13:11:22","date_gmt":"2023-03-17T13:11:22","guid":{"rendered":"\/knowledge\/forums\/topic\/how-can-i-define-mass-exchange-between-phases-in-multi-phase-flow\/"},"modified":"2023-07-31T12:27:32","modified_gmt":"2023-07-31T12:27:32","slug":"how-can-i-define-mass-exchange-between-phases-in-multi-phase-flow","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-define-mass-exchange-between-phases-in-multi-phase-flow\/","title":{"rendered":"How can I define mass exchange between phases in multi-phase flow?"},"content":{"rendered":"<p>In the multi-phase flow model, it is possible to define the mass exchange between the phases by a constant or a UDF.  If you want to set in constant, click Interaction&#8230; in the Phases panel to open the Phase Interaction panel. Then, click on the Mass tab. Change Number of Mass Transfer Mechanisms to 1. Change Mechanism to constant-rate and set a numerical value.  If you want to use a UDF, use the DEFINE_MASS_TRANSFER or DEFINE_LINEARIZED_MASS_TRANSFER macro to define the mass exchange and use, then compile and load it. Then, select user-defined for the Mechanism in the Phase Interaction panel and import the UDF link.  In addition, you can also be set using the DEFINE_SOURCE macro. In this case, by the source set of Fluid panel, you need to link to each phase of the source term.   Note: DEFINE_LINEARIZED_MASS_TRANSFER macro is available from R14.0 and up.<\/p>\n<p>Attachments:<br \/>\n1. <a href=https:\/\/ansys13.ansys.com\/KnowledgeArticles\/Phase-1\/2043303\/2043303.pdf>2043303.pdf<\/a><\/p>\n","protected":false},"template":"","class_list":["post-166220","topic","type-topic","status-publish","hentry","topic-tag-14-5","topic-tag-fluent","topic-tag-fluid-dynamics","topic-tag-mp-eulerian-mp-flow","topic-tag-multiphase","topic-tag-phase-change"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_last_active_time":["3-15-2023  20:20:33"],"_bbp_forum_id":["27809"],"_bbp_author_ip":["23.56.168.180"],"_btv_view_count":["3318"],"siebel_km_number":["2043303"],"product_version":["14.5"],"km_published_date":["2016-09-20T00:10:16.000Z"],"family":["Fluid Dynamics"],"application_name":["FLUENT"]},"test":"solution"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/166220","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics"}],"about":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/types\/topic"}],"version-history":[{"count":0,"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/166220\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=166220"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}