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 A. thinner than the velocity boundary layer B. thicker than the velocity boundary layer C. of the same thickness as the velocity boundary layer D. not formed at all
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Thermal Boundary Layer - GATE ME '15 S1
Thermal Boundary Layer - GATE ME '15 S1
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Correct Option is D.
The velocity boundary forms due to the presence of relative velocity difference between plate and flowing fluid.
Similarly, thermal boundary layer only forms if there is a difference between plate temperature and fluid temperature.