Refer to Q7, Q8 and Q9, and determine Power Number from the appropriate correlation, and calculate the uncorrected Power required. (Gc = 32.2).(a) 5.3 Hp(b) 6.3 Hp(c) 5.6 Hp(d) 6.6 HpThe question was posed to me in an interview for internship.Enquiry is from Power Requirements for Mixing topic in chapter Fluid Flow and Mixing of Bioprocess Engineering

Refer to Q7, Q8 and Q9, and determine Power Number from the appropriat

1.	Refer to Q7, Q8 and Q9, and determine Power Number from the appropriate correlation, and calculate the uncorrected Power required. (Gc = 32.2).(a) 5.3 Hp(b) 6.3 Hp(c) 5.6 Hp(d) 6.6 HpThe question was posed to me in an interview for internship.Enquiry is from Power Requirements for Mixing topic in chapter Fluid Flow and Mixing of Bioprocess Engineering
Answer» Right answer is (a) 5.3 Hp For EXPLANATION: The correlations calculate the DELIVERED Power to the fluid. This must be corrected BACK to the agitator motor and account for efficiency LOSSES in the motor, gearbox, and bearings. PDelivered = (NP ρB * N^3 * DA^5) / GC PDelivered = 6 * 64 * 1^3 * 3^5 / 32.2 PDelivered = 2,898 ft-lb/sec or using 550 ft-lb/sec per Hp, PDelivered = 5.3 Hp.

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