CAJ | 학술논문

针对窄矩形通道内弹状流的气弹行为和阻力特性问题，以空气和水为工质，应用高速摄影仪，对3．25 mm×43 mm的竖直矩形通道进行了弹状流的可视化研究。实验共获得111组数据，气、液相雷诺数范围分别为55～2042和1115～22016。实验结果表明，气弹上升速度随两相折算速度线性增加；气弹长度随液相折算速度的增加而减小，随气相折算速度的增加近似线性增大；气弹区（1≤L*b ＜2），气弹宽度随气相流量的增大而显著增大，到达加长气弹区（L*b ≥2），气弹宽度基本稳定。基于两相折算速度的雷诺数对实验数据进行拟合，拟合关系式的误差为14．7％。
침대착구형통도내탄상류적기탄행위화조력특성문제，이공기화수위공질，응용고속섭영의，대3．25 mm×43 mm적수직구형통도진행료탄상류적가시화연구。실험공획득111조수거，기、액상뢰낙수범위분별위55～2042화1115～22016。실험결과표명，기탄상승속도수량상절산속도선성증가；기탄장도수액상절산속도적증가이감소，수기상절산속도적증가근사선성증대；기탄구（1≤L*b ＜2），기탄관도수기상류량적증대이현저증대，도체가장기탄구（L*b ≥2），기탄관도기본은정。기우량상절산속도적뢰낙수대실험수거진행의합，의합관계식적오차위14．7％。
Focused on the slug behaviors and resistance, a visualization study on slug flow in a vertical narrow rec-tangular duct (3.25 mm×43 mm) is carried out by using a high-speed camera. Air and water are used as the test medium in present study. The Reynolds numbers of air and water were 55~2 042 and 1 115~22 016 respectively, and 111 data points were obtained during the experiment. The results show that slug velocity increases linearly with the increase of two-phase superficial velocity. The slug length decreases as the liquid superficial velocity increases and it increases nearly linearly as the gas superficial velocity grows. The slug width increases dramatically as the gas superficial velocity increases in the slug region (1≤L*b < 2) , and it remains essentially the same in the elongated slug region ( L*b ≥2) . The correlation is proposed with a Reynolds number based on the two-phase superficial ve-locity and the deviation of the new correlation is 14.7%.