Question:-
Consider the following conditions for heat transfer (thickness of thermal boundary layer is dt, velocity of boundary layer is d and pradtl number is Pr)
1. dt(x) = d(x) if Pr = 1
2. dt(x) >> d(x) if Pr << 1
3. dt(x) << d(x) if Pr >> 1
Which of these conditions apply for convective heat transfer ?
Option (A)
1 and 2
Option (B)
2 and 3
Option(C)
1 and 3
Option(D)
1, 2 and 3
Correct Option:
(D)
Question Solution:
d = dt(Pr1/3) = hydrodynamic boundary thickness
dt = thermal boundary layer thickness

question-answer-faq-6089