The Sieder-Tate correlation for heat transfer in turbulent flow in pipe gives Nu α Re0.8, where, Nu is the Nusselt number and Re is the Reynolds number for the flow. Assuming that this relation is valid, the heat transfer co-efficient varies with the pipe diameter D. as _________________?
Correct answer: B. D-0.2
- A. D-1.8
- B. D-0.2
- C. D0.2
- D. D1.8
Explanation
Since Nu = hD/k and Nu is proportional to Re^0.8, while Re is proportional to D at fixed velocity and fluid properties, h is proportional to D^0.8/D = D^-0.2. Thus the coefficient decreases slightly as diameter increases.
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