The formula Np=\(\frac{P}{n^3Da^5\rho}\) denotes which number in impeller problems?
a) Weber number
b) Froude number
c) Power number
d) Euler Number
Answer: c
Explanation: Powernumber is the ratio of inertial force to viscous force. It is dimensionless and Buckingham’s Pi theorem is applied to it, thus giving the formula Np=\(\frac{P}{n^3Da^5\rho}\) , where P is the Pressure of the liquid, n is the rotation per minute of the impeller, D is the diameter and ρ is the density of the liquid.
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