Is a laminar or turbulent boundary layer better for heat transfer from the surface to the environment?

Mechanical Engineering Heat Transfer
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Turbulent flow (High Reynold’s Number) makes the thermal boundary layer small which allows for better (faster cooling). Laminar flow (Low Reynolds #) has thick thermal & hydrodynamic boundary layer which is bad for cooling

Definitions:

  • Thermal Boundary Layer: Fluid through which the velocity varies from zero at the surface to a finite value u_∞ associated with the flow.