All analogy equations connecting friction factor and heat transfer co-efficient apply only to ___________________?
Correct answer: A. Wall or skin friction
- A. Wall or skin friction
- B. Form friction
- C. Both A. and B.
- D. Turbulent flow
Explanation
Heat-transfer and friction analogies relate wall shear stress to heat transfer at the fluid-solid interface, so they apply to skin or wall friction. Form friction arises from pressure drag and is not represented by these boundary-layer analogies.
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