Q 47. The ratios of the laminar hydrodynamic boundary layer thickness to thermal
boundary layer thickness of flows of two fluids P and Q on a flat plate are 1/2
and 2 respectively. The Reynolds number based on the plate length for both the
flows is 
. The Prandtl and Nusselt numbers for P are 1/8 and 35 respectively.
The Prandtl and Nusselt numbers for Q are respectively
(A) 8 and 140
(B) 8 and 70
(C) 4 and 40
(D) 4 and 35
Answer: (A)
Explanation:
