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0 ft. Impeller Diameter (D) = 3.0 ft. Impeller type = Flat blade turbine. # of blades = 6 Blade width (W) =7 inches. Blade length (L) = 9 inches. Number of Baffles = 4; equally spaced. Baffle width (B) = 11 inches. Liquid Depth (H) = 9.0 feet. Impeller height above vessel bottom (Z) = 3 feet.(a) 2, 400 rph(b) 4, 500 rph(c) 3, 500 rph(d) 3, 600 rphThis question was posed to me by my school principal while I was bunking the class.The above asked question is from Power Requirements for Mixing in division Fluid Flow and Mixing of Bioprocess Engineering

Answer» RIGHT choice is (d) 3, 600 rph

For explanation: N = revolutions per hour (rph). The AGITATION speed is given in the example as 60 revolutions per minute, which when MULTIPLIED by 60 minutes/hr yields:

N = 60 RPM * 60 = 3,600 rph.


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