The inside heat transfer co-efficient in case of turbulent flow of liquid in the tube side in a 1-2 shell and tube heat exchanger is increased by ______________ times, when the number of tube passes is increased to 8?
Correct answer: B. 40.8
- A. 20.8
- B. 40.8
- C. 40.4
- D. 20.4
Explanation
For turbulent flow in a tube, the inside heat-transfer coefficient varies approximately as velocity^0.8. Increasing tube passes from 2 to 8 quadruples the velocity, so the increase is 4^0.8, represented by option b.
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