Boundary layer is defined as

1.	Boundary layer is defined as
A.	A thin layer at the surface where gradients of both velocity and temperature are small
B.	A thin layer at the surface where velocity and velocity gradients are large
C.	A thick layer at the surface where velocity and temperature gradients are large
D.	A thin layer at the surface where gradients of both velocity and temperature are large
Answer» E.

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Boundary layer is defined as

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