{"id":44996,"date":"2020-06-11T11:11:34","date_gmt":"2020-06-11T11:11:34","guid":{"rendered":"\/forum\/forums\/topic\/how-to-make-variants-of-surface-tension\/"},"modified":"2020-06-11T11:11:34","modified_gmt":"2020-06-11T11:11:34","slug":"how-to-make-variants-of-surface-tension","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/how-to-make-variants-of-surface-tension\/","title":{"rendered":"How to make variants of surface tension?"},"content":{"rendered":"

Hi I am using VOF method in ansys fluent. I have a dissertation project which is evaluating the effect of surfactants in the surface tension of a mixture between water and gas (methane in this case).   Since surfactants are not available in Ansys, I decided to only use water and methane (and air) mixture (three phases), and varying the surface tensions referring to some surface tension datas from past journals.   I modelled three scenarios which each has its own surface tensions, but all showed the same results<\/strong>\"?\" <\/p>\n

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(Note: gas in this case = methane)<\/p>\n

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Scenario 1; SFT water-gas = 73 mN\/m, SFT water-air = 73 mN\/m, SFT gas-air = none. I also include wall adhesion where as; air-gas = 90deg, water-air = 90deg, water-gas = 90 dec<\/p>\n

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Scenario 2; SFT water-gas = 30 mN\/m, SFT water-air = 30 mN\/m, SFT air-gas = none. Wall adhesion; air-gas = 90, water-gas = 150, water-air = 150 <\/p>\n

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Scenario 3; SFT water-gas = 0.01, SFT water-air = 0.01, SFT air-gas = none. Wall adhesion; water-gas = 180deg, water-air = 180deg, and air-gas = 90deg  <\/p>\n

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Please someone kindly help me to solve this because I have spent a week for nothing figuring all by myself.    <\/p>\n

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Also other datas such as:<\/p>\n

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Ansys fluent CFD Method: VOF 2D modelling<\/p>\n

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Geometry: rectangular with 3 ft tall and 0.333ft width. Has two inlets ( bottom right for gas(methane), bottom left for water) and one outlet at the top.<\/p>\n

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Explicit formulation, interface modelling sharp, interfacial anti-diffusion is activated, Model: continuum surface force, wall adhesion is activated (I want to activate jump adhesion but it says “jump adhesion is only supported with cell based smoothing”) <\/p>\n

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Velocity water inlet = 200 ft\/s, Velocity gas(methane) inlet = 190 ft\/s.   The meshing has element size of 5e-003 m which doesn’t include refinement adaption. I attached the meshing as a picture here.  <\/p>\n

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Once again, please someone help, I have spent a week without any progress\"?\"  <\/p>\n

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Sincerely, Stefano P  <\/p>\n

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  \"\"\"\"  <\/p>\n","protected":false},"template":"","class_list":["post-44996","topic","type-topic","status-closed","hentry"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_old_topic_id":["17177"],"_bbp_old_topic_author_name_id":["Anonymous"],"_bbp_old_is_topic_anonymous_id":["false"],"_bbp_old_closed_status_id":["publish"],"_bbp_author_ip":[null],"_bbp_old_sticky_status_id":["normal"],"_bbp_likes_count":["0"],"_btv_view_count":["1324"],"_bbp_subscription":["251865"],"_bbp_topic_status":["unanswered"],"_bbp_status":["publish"],"_bbp_topic_id":["44996"],"_bbp_forum_id":["27784"],"_bbp_engagement":["199","177724"],"_bbp_voice_count":["2"],"_bbp_reply_count":["4"],"_bbp_last_reply_id":["117484"],"_bbp_last_active_id":["117484"],"_bbp_last_active_time":["2020-06-12 10:02:58"]},"test":"stefanotepo0"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/44996","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\/44996\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=44996"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}