I have read in many papers that in a thin thermal boundary we have high local heat transfer coefficient, i.e better heat transfer by convection. what is the reason behind this?
Thank you in advance
A thick boundary layer acts as insulation so heat transfer is reduced. A thinner layer means less insulation and closer proximity to the moving fluid which takes the heat away. Remember we're interested in heat transfer, the heat transfer coefficient is a value used to compare systems.
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