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Mechanical Engineering · Q119

Heat And Mass Transfer

Engineering and GATE · Mechanical Engineering · question 119

Q119

The thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

A.
Equal to one
Answer
B.
Greater than one
C.
Less than one
D.
Equal to Nusselt number

Answer: Option A

Solution

Answer: Option A
Solution:
If the Prandtl number (Pr) is 1, the two boundary layers (hydrodynamic and thermal) are the same thickness.
If the Pr > 1, the thermal boundary layer is thinner than the velocity boundary layer.
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