Question

For a steady two-dimensional flow, identify the boundary layer approximations.

A. The velocity component in the flow direction is much larger than that in the normal direction.
B. The temperature and velocity gradients normal to the flow are much greater than those along the flow direction.
C. The temperature and velocity gradients normal to the flow are much less than those along the flow direction.
D. The velocity component in the flow direction is much less than that in the normal direction.

Answer 1

• The velocity component in the flow direction is much larger than that in the normal direction ( A )
• The temperature and velocity gradients normal to the flow are much greater than those along the flow direction ( b )

Step-by-step explanation:

For a steady two-dimensional flow the boundary layer approximations are The velocity component in the flow direction is much larger than that in the normal direction and The temperature and velocity gradients normal to the flow are much greater than those along the flow direction

assuming Vx ⇒ V∞ ⇒ U and Vy ⇒ u from continuity equation we know that

Vy << Vx