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It is desire to flash-mix some chemicals with incoming wastewater that is to be treated. Mixing is to be accomplished using a flat-paddle mixer 500 mm in diameter having six blades. Is the temperature of the coming water is 10 μC and the mixing chamber power number is 1.70, determine:

(a) the speed of rotation when the Reynolds number is approximately 100,00

(b) what it is desirable to have a high Reynolds number in most mixing operations?

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