211 Study on Enhancement of Critical Heat Flux by Supplying Liquid-jets to Heating Surface : 2nd Report, Effect of Distance between Supplying Liquid-jets and Examination of Flow Pattern near Surface
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The establishment of high heat removable technology is required in future industrial field. In this study, as a proposal of the high heat removable technology, the enhancement of a critical heat flux -CHF- in pool boiling was investigated by supplying liquid- jets to the heating surface. The effect of distances between liquid-jets on the enhancement of CHF was examined focusing on flow pattern near the heating surface in the present report. Experiments were conducted using a pure copper block and saturated water for pool boiling at atmospheric condition. The distances between the jet-nozzles and the test section were 1, 6 and 15 mm. The adopted inner-diameter of the jet-nozzles was 0.9 or 0.51 mm. The number of the jet-nozzles were one, two and three : the distances between the supplying liquid-jets were infinity, 30 and 15 mm, respectively. The enhancement rate of the critical heat flux related to the flow rate of liquid-jets. These results suggested that the enhancement of critical heat flux was affected additional supplied liquid quantity to the macrolayer on the heating surface.
