# CFD-Simulation of a bubbly flow

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 March 2, 2000, 09:08 CFD-Simulation of a bubbly flow #1 Nicola Bundschuh Guest   Posts: n/a Hi all, I am working with effervescent atomizers, means there is a flow in a conentric tube, outside oil, inside pressured air, and near the exit orifice the air enters into the oil and forms a bubbly flow which passes through the exit orifice. By exiting the airbubbles are exploding and producing a fine spray. Has anybody an idea if it is possible to calculate the mixing and the two phase flow and also the resulting Spray with Fluent? Or is there a code with a population theory for this problem?

 March 6, 2000, 23:06 Re: CFD-Simulation of a bubbly flow #2 I. Jameel, Ph.D. Guest   Posts: n/a Please check with Dr. Jim Bugg at the U of Saskatchewan. He did his Ph.D. on the ejection of bubles from a large orifice into a submerged tank. This was ~10yrs ago. The code used was a Los-Alamos code SOLA-VOF where the VOF technique was pioneered. Now ther is a commercial version of this code called FLOW-3D. I would recommend you check with Dr. Hirt on the FLOW-3D code. Cheers, MIJ

 March 8, 2000, 06:21 Re: CFD-Simulation of a bubbly flow #3 Nicola Bundschuh Guest   Posts: n/a Dear all, in the firm I am working only fluent is used. Are there some experiences in simulating a bubbly flow with high velocity by using fluent? I will do it in 2-D, but 3-D would be better. Thanks, Nicola

 March 31, 2000, 17:52 Re: CFD-Simulation of a bubbly flow #4 David Schmidt Guest   Posts: n/a Hi, I tried using the Real Gas capability of Fluent to define an equation of state that describes bubbly flow. However, I could not get it to be stable with the exit boundary conditions for a nozzle calculation. As you know, bubbly flows have a very low speed of sound requiring trans-sonic numerics in the BC. Good luck, David

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