bubble column
I am using inlet same condition for bubble column and with try and error I found that 0.3 is suitable for my case.can we share our information?

Hi OJ
I am working on some validation of bubble column simulations. against Becker 1994, 1999. I am actually using option 1 at the moment. I have a question about running a 2D case. Since there is no thickness of the bubble column, then how do you determine the inlet gas velocity in this case? The second question I have is whether it is okay to use 100% air at the inlet? Thanks 
What do you mean by determine the inlet gas velocity? What do you know about the case you are trying to simulate?
Whether 100% air is OK will depend on what you are trying to do and how you are modelling it. 
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Since I am using OpenFOAM twoPhaseEulerFoam for the calculation. If I would like to perform a 2D bubble column simulation, what is the inlet gas velocity I should impose at the inlet nozzle? Since OpenFOAM use 1 cell in the third dimension for the 2D case, the problem is whether the inlet gas velocity will be dependent on the length in third dimension, i.e. the depth of the bubble column? If it is not, then how the inlet gas velocity should be calculated for 2D bubble column? Thanks Jie 
Try the OpenFOAM forum. This is the CFX forum.

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I think this a general question, which is about how to calculate the correct inlet gas velocity that should be applied at the inlet nozzel for 2D bubble column based on the experimental superficial gas velocity. Thanks Jie 
I do not know how OpenFOAM has handled this so I cannot say in your case. But I would have thought it very easy to just try it and find out  can't you just try a velocity and see what it does?

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