疑似二次元空間における沸騰構造の研究 : (自然対流沸騰系における高熱流束核沸騰)

概要

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In this study, observation of boiling phenomena in a quasi-two-dimensional space is attempted to attain a good understanding of the bubble structure in high-heat-flux nucleate boiling. A horizontal ribbon heater is sandwiched by two vertical glass plates to realize the two-dimensional boiling space, and the boiling phenomena are observed through the glass plate. The experimental parameters are the ribbon width and glass plate height. First, it is concluded that the boiling phenomena observed in this experiment are similar to those in conventional three-dimensional space, because both the nucleate boiling curve and the critical heat flux are in good agreement with the respective conventional correlations. Experimental results indicate that filmwise coalescent bubbles appear in high-heat-flux nucleate boiling and a liquid subfilm with vapor domes exists between the boiling surface and the filmwise coalescent bubble. Interfacial waves, whose wavelengths are nearly equal to the most dangerous wavelength of the Rayleigh-Taylor instability, are observed at the upper interfaces of filmwise coalescent bubbles, and this result indicates that the bubble departure process in high-heat-flux nucleate boiling is dominated by the interfacial instability.
1997-02-25