What is the diameter of droplets in Schiller and Naumann model for fluidfluid drag?
For fluidfluid exchange coefficient, the default is the Schiller and Naumann. In this model, there is a parameter named dp. dp is the diameter of the bubbles or droplets of dispersed phase. but, what is the dp? several mm or determined by a formula?
thanks! 
i think u can give a estimated value, in my case i set the diameter of bubbles in euler mutiphase method 0.001m.

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