How to specify continuous phase (water) diameter in multiphaseEulerFoam or twophasee

sinhavivekananda318 · May 17, 2023, 14:14

Hi all,

Currently I am working on bubble column simulation in 2 D. I am using water and air as continuous and dispersed phases. I am a bit confused as I see the transport properties or phase properties file that the water diameter needs to be given. I understand that in eulerian approach diameter of the two phases has to be given , but as water is continuous and it never forms bubble in the practical experiment, so what value should I give in water diameter.

Should I keep it large like say, around 1 meter so that it becomes the continuous phase?
If you can throw some lights it will be very helpful.

Regards

humber11 · May 22, 2023, 14:38

That's correct, depending on the type defined in the blending, however if it is defined as none the continuous phase can be considered as 1. An example is the fluidizedbed tutorial. The openfoam in the bubble column case is linear type in blending, so the phases are not fully continuous or dispersed, so the particle diameter has to be specified.

I believe that the diameter to be specified is the diameter of the water particle. Which influences the interphase term of the momentum equation.

May 17, 2023, 14:14	How to specify continuous phase (water) diameter in multiphaseEulerFoam or twophasee	#1
sinhavivekananda318 New Member Vivekananda Join Date: May 2017 Location: Cardiff, UK Posts: 27 Rep Power: 9	Hi all, Currently I am working on bubble column simulation in 2 D. I am using water and air as continuous and dispersed phases. I am a bit confused as I see the transport properties or phase properties file that the water diameter needs to be given. I understand that in eulerian approach diameter of the two phases has to be given , but as water is continuous and it never forms bubble in the practical experiment, so what value should I give in water diameter. Should I keep it large like say, around 1 meter so that it becomes the continuous phase? If you can throw some lights it will be very helpful. Regards

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May 22, 2023, 14:38		#2
humber11 New Member Humberto Join Date: Mar 2021 Location: Brasil Posts: 24 Rep Power: 5	That's correct, depending on the type defined in the blending, however if it is defined as none the continuous phase can be considered as 1. An example is the fluidizedbed tutorial. The openfoam in the bubble column case is linear type in blending, so the phases are not fully continuous or dispersed, so the particle diameter has to be specified. I believe that the diameter to be specified is the diameter of the water particle. Which influences the interphase term of the momentum equation.