A company producing detergents uses industrial minerals such as phosphate salts and silica in their formulations. The company treats silica particles with a special fluid in a 100 m³ tank before they can be used. What is the settling velocity of the spherical clay particles of diameter 50 µm if the volume fraction of the particles in the solvent is 0.4 and the only external force is the gravity? The density difference between the clay particles and solvent is 2400kg/m?; the density and viscosity of the solvent are 1100kg/m and 102 Pa.s, respectively. The exponential constant is 3 and CD=0.6.

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