phase inversion

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 December 11, 2005, 23:56 phase inversion #1 Rashmi Guest   Posts: n/a hi all iam trying to simulate phase inversion in horizontal pipe(two phase L-L flow)..using fluent how can i know where exactly the phase inversion is occuring? any body has any idea regarding this? i thought if i have the experimental values of the pressure and i know at what length of the pipe the phase inversion is occuring then i can create a plane at that point and monitor the pressure...but how do i get the other pressure values to plot the graph. can anyone help me out thanks Rashmi

 December 12, 2005, 11:29 Re: phase inversion #2 kp@dal.ca Guest   Posts: n/a Eulerian approach cannot handle phase inversion. And PBE implementation in FLUENT does not support VOF. That is the reason why I told you ealier you have to focus on bubbly flows only. And it is very hard to find papers in horizontal pipes that to for liquid-liquid in bubbly regime. In G-L there are a few such as those by Iskandrani et al. (1999). KP

 December 12, 2005, 11:36 Re: Follow up of phase inversion #3 kp@dal.ca Guest   Posts: n/a On top of it you cannot use 2D to solve horizontal pipes. U have to use 3D to get good and correct results. KP

 December 12, 2005, 20:59 Follow up of phase inversion #4 Rashmi Guest   Posts: n/a iam using 3d but how do i proceed for simulating phase inversion.which model i have to use if go for bubbly flow. Rashmi

 December 13, 2005, 04:37 Follow up of phase inversion #5 Rashmi Guest   Posts: n/a hi KP is there any udf where i can increase the vol fraction of oil after x iterations keeping the velocity of oil and water constant to get the phase inversion. at phase inversion point the effective viscosity of the mixture is greater then the mixture viscosity.so i write a udf for this will it work?? Rashmi

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