{"id":349686,"date":"2024-02-07T14:30:23","date_gmt":"2024-02-07T14:30:23","guid":{"rendered":"\/forum\/forums\/topic\/facing-an-issue-with-the-discrete-population-balance-model-in-a-multiphase-flow\/"},"modified":"2024-02-07T14:30:23","modified_gmt":"2024-02-07T14:30:23","slug":"facing-an-issue-with-the-discrete-population-balance-model-in-a-multiphase-flow","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/facing-an-issue-with-the-discrete-population-balance-model-in-a-multiphase-flow\/","title":{"rendered":"Facing an issue with the discrete population balance model in a multiphase flow"},"content":{"rendered":"

I am working on a multiphase flow using population balance to track the development of a dispersed secondary phase, in a cylindrical pipe.<\/p>\n

The geometry is 2D. It’s a rectangle.<\/p>\n

The inlet is split into 2: a water inlet and an air inlet. The inlet velocities are such that the inlet volume fraction of air is 10%.<\/p>\n

I use the Eulerian multiphase model, and the Discrete population balance model.<\/p>\n

I set my minimum diameter as 8e-06 m, and my maximum diameter as 8e-03 m. I set the bin number to 30. I can then print the bin sizes, which I use in MATLAB to obtain the bin fractions as a normal distribution, as shown in Plot 1.<\/p>\n

\"\"<\/p>\n

I initialized the air inlet with these bin fractions.<\/p>\n

The pipe is 2-m long, and so I defined a line every 0.1 m starting at the inlet and ending at the outlet. At each line I defined a report file for the number densities of each bins.<\/p>\n

After running the simulation and processing the data, having the number densities of each bin at each line, I plot Number density vs Bin size, in Plot 2, at the whole inlet (the line at x=0).<\/p>\n

\"\"<\/p>\n

Plot 3 shows Number densities vs Bin sizes at the air inlet only.<\/p>\n

\"\"<\/p>\n

My issue is that the number densities, which are proportional to the bin fractions, should supposedly also show a normal distribution, since this is how I initialized them.<\/p>\n

Can anyone knowledgeable on the matter provide me with any insights please?<\/p>\n","protected":false},"template":"","class_list":["post-349686","topic","type-topic","status-closed","hentry","topic-tag-multiphase_models-1","topic-tag-population-balance-model"],"aioseo_notices":[],"acf":[],"custom_fields":[{"0":{"_bbp_subscription":["338700","199"],"_bbp_author_ip":["23.218.248.146"]," _bbp_last_reply_id":["0"]," _bbp_likes_count":["0"],"_btv_view_count":["343"],"_bbp_topic_status":["unanswered"],"_bbp_topic_id":["349686"],"_bbp_forum_id":["27792"],"_bbp_engagement":["199","338700"],"_bbp_voice_count":["2"],"_bbp_reply_count":["1"],"_bbp_last_reply_id":["349706"],"_bbp_last_active_id":["349706"],"_bbp_last_active_time":["2024-02-07 15:38:18"]},"test":"cgn08mail-aub-edu"}],"_links":{"self":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/topics\/349686","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\/349686\/revisions"}],"wp:attachment":[{"href":"https:\/\/innovationspace.ansys.com\/forum\/wp-json\/wp\/v2\/media?parent=349686"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}