The boundary layer is that part of a moving fluid, in which the fluid velocity is_________________?
Correct answer: C. Affected by the presence of a solid boundary
- A. Affected by the fluid flow pressure
- B. Constant
- C. Affected by the presence of a solid boundary
- D. All A., B. and C.
Explanation
The boundary layer is the region next to a solid surface where viscous effects make the fluid velocity differ from the external-flow velocity. The defining feature is therefore the influence of the solid boundary, not constant velocity.
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