You want to suspend solid pellets of sucrose (rho = 1500 kg/m^-3) with a mean di

Question

You want to suspend solid pellets of sucrose (rho = 1500 kg/m^-3) with a mean diameter of 1.2 cm in water (rho = 995 kg/m^-3, mu = 0.00002 Pa s). The tank diameter is 1.2 m, and the impeller is 0.3 m off the bottom of the tank. The motor for your impeller turns at a maximum speed of 300 rpm The height of the mixture in the tank is 12m and the total mass of the sucrose in the mixture is 101.8 kg. You have the choice of using two six-bladed turbines, one with a diameter of 0.3 m and one with a diameter of 0.4 m. Which one should you use? Justify your answer.

Explanation / Answer

Answer In the agitation and Mixing Dynamics the Mass transfer only depends upon on the Reynold No of Turbines.

Therefore it requires Higher Lift/Drag ratio. Therefore to obey this Turbine with lesser diameter should be used in order to have adequate amount of the mass transfer.

Impeller Vessel Diameter Ratio should also be less D/T for the correct choice of Turbine .Hence in this case the turbine with lesser diameter that is .3 m should be used.

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