When does the heat generated by fluid friction becomes appreciable compared to the heat transferred between the fluids ?
Correct answer: C. At high fluid velocity
- A. When fluid flows past a smooth surface
- B. At low velocity
- C. At high fluid velocity
- D. None of these
Explanation
Frictional heat generation increases strongly with fluid velocity because the pressure drop and viscous dissipation rise with flow rate. It becomes appreciable relative to heat transfer at high velocity.
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