{"id":161893,"date":"2023-01-25T07:17:14","date_gmt":"2023-01-25T07:17:14","guid":{"rendered":"\/knowledge\/forums\/topic\/how-can-i-convert-relative-humidity-into-a-mole-fraction-that-can-be-used-as-bc-value-at-inlet-boundary-in-fluent\/"},"modified":"2023-07-31T12:36:05","modified_gmt":"2023-07-31T12:36:05","slug":"how-can-i-convert-relative-humidity-into-a-mole-fraction-that-can-be-used-as-bc-value-at-inlet-boundary-in-fluent","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/how-can-i-convert-relative-humidity-into-a-mole-fraction-that-can-be-used-as-bc-value-at-inlet-boundary-in-fluent\/","title":{"rendered":"How can I convert relative humidity into a mole fraction that can be used as BC value at inlet boundary in Fluent?"},"content":{"rendered":"<p>The steps below explain how to convert relative humidity value into mole fraction, which can be entered as a boundary condition value  1) Relative humidity = 100 * Partial pressure of vapor in air \/ partial pressure of vapor in air at saturation 2) Partial pressure of vapor in air at saturation = saturation pressure of water at the cell temperature  3) Using 1) &#038; 2), you will get partial pressure of vapor in air   4) As per Dalton&#8217;s law of partial pressures, partial pressure of vapor in air \/ total pressure of air = mole fraction of vapor  5) Mole fraction can be specified as an input at the inlet BC in the species tab.<\/p>\n","protected":false},"template":"","class_list":["post-161893","topic","type-topic","status-publish","hentry","topic-tag-16-1","topic-tag-bcs-interfaces","topic-tag-fluent","topic-tag-fluid-dynamics","topic-tag-materials","topic-tag-reaction","topic-tag-species-reactions"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_wp_page_template":["default"],"_bbp_forum_id":["27784"],"_bbp_author_ip":["23.56.168.180"],"_bbp_last_active_time":["1-24-2023  20:20:30"],"_btv_view_count":["2768"],"siebel_km_number":["2036644"],"product_version":["16.1"],"km_published_date":["2014-03-20T13:17:36.000Z"],"family":["Fluid Dynamics"],"application_name":["FLUENT"]},"test":"articlesansys-com"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/topics\/161893","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\/161893\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/knowledge\/wp-json\/wp\/v2\/media?parent=161893"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}