Heat flux increases with temperature drop beyond the Leiden frost point in the plot of heat flux vs. temperature drop for a boiling liquid, because___________________?
Correct answer: D. Radiation becomes important
- A. Convection becomes important
- B. Conduction becomes important
- C. Sub-cooled boiling occurs
- D. Radiation becomes important
Explanation
Beyond the Leidenfrost point, a stable vapour film separates the liquid from the hot surface, reducing direct conduction and convection. As the temperature difference grows, thermal radiation becomes increasingly significant and raises the heat flux.
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