Multiple choice

For the flow of viscous fluid over a flat plate, if the fluid temperature is the same as the plate temperature, the thermal boundary layer is

  1. thinner than the velocity boundary layer

  2. thicker than the velocity boundary layer

  3. of the same thickness as the velocity boundary layer

  4. not formed at all
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D Correct answer
Explanation

For the flow of viscous fluid over a flat plate, if the fluid temperature is the same as the plate temperature, the thermal boundary layer is not formed at all because boundary layer formation takes place if there is some difference in fluid property of no slip layer and the remaining fluid. As given here, fluid is viscous and flowing over a flat plate. Here, definitely a kinematic boundary layer will be formed, but as there is no temperature difference, so no formation of thermal boundary layer.

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