GATE ME 2014 Set 1 — Question 24
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Fluid Mechanics → Convection → Boundary Layer Separation
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Question
Consider a two-dimensional laminar flow over a long cylinder as shown in the figure below. The free stream velocity is and the free stream temperature is lower than the cylinder surface temperature . The local heat transfer coefficient is minimum at point
Correct answer
(B) 2
Solution
For laminar flow over a cylinder, the local heat transfer coefficient () is highest at the front stagnation point (Point 1) and decreases as the boundary layer develops. The minimum value of occurs at the point of flow separation. For laminar flow, separation typically occurs at an angle of approximately to from the stagnation point. Point 2, located at , is the closest point to the separation region among the given options. Thus, the local heat transfer coefficient is minimum at point 2.
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