In a shell and tube heat exchanger, the tube side heat transfer co-efficient just at the entrance of the tube is_________________?
Correct answer: A. Infinity
- A. Infinity
- B. Zero
- C. Same as average heat transfer co-efficient for tube side
- D. None of these
Explanation
At the tube entrance, the thermal boundary layer starts with essentially zero thickness, so the local temperature gradient and hence the local heat-transfer coefficient are theoretically infinite. The coefficient decreases downstream as the boundary layer develops.
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