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P. #3: An engineer conducted pool boiling experiments on a commonly used industrial copper substrate and…
P. #3: An engineer conducted pool boiling experiments on a commonly used industrial copper substrate and obtained the following “Pool boiling Curve”. He identified four different boiling regimes: (1) natural or free convection, (2) nucleate boiling, (3) transition boiling, and (4) film boiling. You, as an R&D researcher, are asked to explain the results and improve the efficiency of the phase-change process. Note: Describe your answer concisely with minimal jargon. 10 Free Convection Nucleate Transition Film Inflection point Surface Heat Flux, W/m² Onset of boiling Isolated Jets and bubbles columns 5 10 30 120 Excess Temperature, °C 1000 P. #3-3: Superhydrophilic coating: You are asked to consider a superhydrophilic coating to improve the boiling process. The coated surface can be achieved by a simple chemical treatment process. (i) Explain whether temperature associated with point A (Onset of Nucleate Boiling, ONB) increases or decreases on the superhydrophilic coated surface. Why? (ii) What happens to slop of AB curve? What does this slope represent? (iii) Also, explain whether heat flux at point C increases or decreases? Why?
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