Consider a two-dimensional laminar flow over a long cylinder

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Consider a two-dimensional laminar flow over a long cylinder as shown in the figure below.

The free stream velocity is U_∞ and the freestream temperature T_∞ is lower than the cylinder surface temperature T_∞. The local heat transfer coefficient is minimum at point

1. 1
2. 2
3. 3
4. 4

Correct Option: B

For laminar flow, the heat transfer coefficient is minimum where the boundary layer thickness is maximum and vice versa. For turbulentregion boundary layer thickness is maximum at 3 but for laminar boundary layer thickness is maximum at 2 so minimum heat transfer coefficient.