At Pr > 1, conduction in an ordinary fluid flowing through a heated pipe is limited to the___________________?
Correct answer: D. Viscous sub-layer
- A. Buffer zone
- B. Turbulent core
- C. Both A. and B.
- D. Viscous sub-layer
Explanation
For Prandtl number greater than one, thermal diffusivity is lower than momentum diffusivity, so the thermal boundary layer lies inside the velocity boundary layer. Heat transfer through this region is therefore mainly by conduction across the viscous sub-layer.
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