In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is ?
Correct answer: A. Less
- A. Less
- B. More
- C. Equal
- D. Unpredictable
Explanation
For flow over a heated flat plate, Pr > 1 means momentum diffuses faster than heat, so the thermal boundary layer is thinner than the hydrodynamic boundary layer. Since Pr ≈ 6, option a follows.
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