Question

what is boundary layer​

Answer 1

Boundary layer, in fluid mechanics, thin layer of a flowing gas or liquid in contact with a surface such as that of an airplane wing or of the inside of a pipe. ... The flow in such boundary layers is generally laminar at the leading or upstream portion and turbulent in the trailing or downstream portion.

Answer 2

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Boundary layer is a thin layer of flowing gas or liquid in contact with a surface.

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