하방비등조건에서 두 개의 가열면에서 형성되는 슬러그 기포가 비등열전달 계수에 미치는 영향
Effect on Heat Transfer Coefficients of two Adjacent Heaters by Interaction of Slug Bubbles on Downward-Facing Nucleate Boiling
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초록
Double slug interaction in downward-facing nucleate boiling was studied to investigate its effect on boiling performance. Two heating surfaces were individually controlled to apply heat flux while their boiling performance were measured. A slug generated from upper heater affect on lower heater to make convectional flow by suction following departure of slug. Moreover, it showed to reduce hovering time of slug bubble on lower heater because it could help bubble departure on lower heater. Meanwhile, a slug generated from lower heater affected on upper heater to make convectional flow by sweeping. However, it showed to increase hovering time of slug bubble on upper heater, because they collapsed to each other. So, the slugs from lower heater enhanced the boiling performance of upper heater with low heat flux condition, but reduced the performance of it with high heat flux condition.
Abstract
Double slug interaction in downward-facing nucleate boiling was studied to investigate its effect on boiling performance. Two heating surfaces were individually controlled to apply heat flux while their boiling performance were measured. A slug generated from upper heater affect on lower heater to make convectional flow by suction following departure of slug. Moreover, it showed to reduce hovering time of slug bubble on lower heater because it could help bubble departure on lower heater. Meanwhile, a slug generated from lower heater affected on upper heater to make convectional flow by sweeping. However, it showed to increase hovering time of slug bubble on upper heater, because they collapsed to each other. So, the slugs from lower heater enhanced the boiling performance of upper heater with low heat flux condition, but reduced the performance of it with high heat flux condition.
참고문헌 (9)
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