gas hold up in bubble

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 November 13, 2006, 01:28 gas hold up in bubble #1 Shelly Guest   Posts: n/a Sponsored Links hi all i need some help regarding bubble column My gas hold up profile is not getting :::lz help I m following the paper of R.krishna(2001) Geometry: D-0.14m, initial liquid height: 0.9m Superficial gas velocity: 0.019m/s to 0.169 m/s U Transitional â€"0.034m/s Phases â€"small bubble â€"4 mm Large bubble â€"32mm Water Below U Transitional only small bubble phase consider Boundry condition : Inlet---velocity inlet Outlet----velocity inlet 2 I startes with course grid : tolal 9000 grids (slightly dence at diffuser and wall) Different Diffuser for small n large bubble (.00175mm edge ) small bubble diffuser is near to wall Large bubble diffuser is near to center I calculate inlet velocity ar diffueser =superficial velocity/volume fraction Outlet velocity is calculate by mass balance as V(inlet) * fraction*edge(i.e.velocity inlet area) *density = v(oulet) * fraction*edge(i.e.velocity inlet area) *density Currently I m simulating only for homogenious flow For this I m using : FLUENT Version: 2d, segregated, eulerian, ske, unsteady (2d, segregated, Eulerian, standard k-epsilon, unsteady) Release: 6.2.16 Quack ,1 st order coupling

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