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High-speed infrared thermographic investigation of water subcooled pool boiling on thin metal foils
Zupančič, Matevž, 1990- ...
In this study we investigate pool boiling of water at 0, 5, 10, and 20 K of subcooling and heat fluxes up to 250 kW/m2. The experiments are performed on smooth 6-[micro]m titanium foil whereas a ...high-speed infrared and video camera are used to measure spatio-temporal surface temperature variations and visualize growing/collapsing vapor bubbles. Results show partial overlaying of boiling curves, which means that a higher degree of subcooling does not necessarily result in a lower average wall temperature. In all cases the bubble activation temperatures in subcooled boiling are higher compared to activation temperatures in saturated boiling. Existing nucleation criteria confirm that phenomenon. This indicates that overlaying of boiling curves cannot be attributed only to some random events on the boiling surface or measurement uncertainties. Experimental data are also presented in the form of recent wall-temperature distributions. All the distributions in subcooled conditions exhibit lower skewness compared to the temperature data obtained in saturated boiling. Subcooled liquid requires larger bubble activation temperature and at the same time limits the local temperature increase. Therefore, the mass of each individual distribution is concentrated on the right side and exhibits negative skewness. This additionally confirms the usefulness of wall-temperature distributions for evaluation and comparison of pool boiling experimental data.
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