Question

If Stanton number is 0.5, Reynolds number is 39 and Nusselt number is 390, then the Prandtl number is:

• A. 1
• B. 10
• C. 2
• D. 20

Hint:

The Nusselt number, Reynolds number, and Prandtl number are all related in convective heat transfer, and the Prandtl number plays a key role in determining the heat transfer characteristics.

Answer 1

The Correct Option is C

The relation between the Nusselt number, Reynolds number, and Prandtl number is given by the empirical equation: \[ Nu = 0.332 \, Re^{1/2} \, Pr^{1/3} \] Substituting the given values: \[ 390 = 0.332 \, (39)^{1/2} \, Pr^{1/3} \] Solving for \( Pr \), we get \( Pr = 2 \).