I am injecting air over plate over which water is flowing(see domain attached), since vf = Qa/(Qa+Qw), Qw and vf are known through this Qa is calculated, and since air inlet dimension is known so velocity at inlet is calculated, but vf should i give at inlet in simulation in fluent, is it 1 or less than 1 or what value.
At the inlet boundary of air, only one phase is entering which is air and that is pure, so volume fraction of air should be equal to 1 at the boundary but when it enter in to the domain, volume fraction will reduce and will be calculated as per your formula.
Dear Mr. Aman,
From my experince, I think you should set the intensity of the air at the inlet of the water to 0.1air + 0.9 water (or 0.2air + 0.8 water). For the inlet of the air is 1.0 air + 0.0 water.
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