Rate of heat transfer by vaporisation from pools of water is affected by the ____________________?
Correct answer: D. All A., B. and C.
- A. Nature of heating surface and distribution of bubbles
- B. Surface tension of water
- C. Viscosity of water
- D. All A., B. and C.
Explanation
Pool-boiling heat transfer depends on bubble formation and departure, which are influenced by surface condition, surface tension and liquid viscosity. Thus all three listed effects can alter the vaporisation rate.
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