The thermal boundary layer at NPr > 1 ?
Correct answer: C. Is thinner than hydrodynamic boundary layer
- A. Is thicker than hydrodynamic boundary layer
- B. And the hydrodynamic boundary layers are identical
- C. Is thinner than hydrodynamic boundary layer
- D. Disappears
Explanation
When Prandtl number exceeds one, momentum diffuses more rapidly than heat, so the velocity or hydrodynamic boundary layer is thicker. Hence the thermal boundary layer is thinner.
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