Question

While \( \frac{DV\rho}{\mu} \) is the general expression for Reynolds number, for an agitator, it is:

• A. \( \frac{\rho}{\mu} 2^2 n D \)
• B. \( \frac{\rho}{\mu} 2 n D \)
• C. \( \frac{\rho}{\mu} 2 n D \)
• D. \( \frac{nD\rho}{\mu} \)

Hint:

Reynolds number for agitators depends on fluid density, viscosity, and the impeller's speed and diameter.

Answer 1

The Correct Option is D

Step 1: Understanding Reynolds Number for Agitators 
Reynolds number for agitators depends on the properties of the fluid and the agitator’s rotational speed. 
Step 2: Conclusion 
For agitators, Reynolds number is calculated as: \[ Re = \frac{\rho n D^2}{\mu} \] This matches option (D).