Question

A rapid mix tank has been designed for a flow of 1 MGD. It has a...

A rapid mix tank has been designed for a flow of 1 MGD. It has a detention time of 30 seconds. The water temperature is 50°F (µ = 2.73 x 10-5 lb-s/ft2). The value of the velocity gradient is to be 850 s-1. The impeller is a turbine type with six curved blades (KT = 4.80) and the diameter is 18 in. What will be the speed of the impeller in rpm?

Engineering   Civil-Engineering   
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Answer #1

The equation for power imparted by rapid mixing tank is given by-

The impeller speed is given by the following equation-

where

Thus, the speed of the impeller is 227.8 rpm.

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