3.6kg of solid particles with a density of 2590 kg/m^3 and a surface-volume average particle size of 748um is filled in a circular container with a diameter of 0.0757m to form a charging layer with a height of 0.475m. Water with a density of 1000 kg/m^3 and a viscosity of 0.001 Pa·s passes through the layer upward. Calculate the following:
(a) the pressure drop of the layer in the initial fluidization.
(b) the vacancy rate of the initial fluidization liquid.
3.6kg of solid particles with a density of 2590 kg/m^3 and a surface-volume average particle size of 748um is filled in
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