In a shell and tube heat exchanger, the overall heat transfer co-efficient is proportional to the tube side (volumetric flow rate)0.8. This is valid, only when the ratio of the tube side film resistance to the total resistance is almost equal to____________________?
Correct answer: B. 1
- A. ∞
- B. 1
- C. 20.8
- D. 2
Explanation
Since tube-side film coefficient varies approximately as flow rate^0.8, the overall coefficient follows the same dependence only when tube-side resistance dominates the total resistance. Therefore, its fraction of the total resistance must be close to 1.
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