液体环轴对称抛撒首次破碎后期的实验研究

An investigation of later period of primary breakupin axisymmetric dissemination of liquid ring

液体抛撒、破碎和雾化过程中 ,首次破碎向二次破碎转化的过程是一个非常重要的阶段。笔者用纹影法对液体环轴对称抛撒首次破碎后期 ,即首次破碎向二次破碎转化的阶段进行了研究。实验结果表明 :首次破碎前期产生的液体块在空气阻力作用下 ,变形成树枝状 ,进而变细变长 ,最后在不稳定性的作用下 ,断裂成更小的液体珠串 ;无水乙醇较水破碎得更为迅速 ;在首次破碎后期中伴随有强烈的二次破碎。

In the process of dissemination, breakup and atomization of liquid, the transient period from primary breakup to secondary breakup is a very important phase. In this paper, an investigation of the later period of primary breakup in the axisymmetric dissemination of a liquid ring has been conducted by schlieren system. The experimental results show that the large liquid blocks formed in the first period of primary breakup were further broken into irregular liquid elements such as “ ligament ” and “ branches ” under the action of air resistance force, then capillary instability of these “ ligaments ” and “ branches ” along their axia direction occurs. Finally “ ligaments ” and “ branches ” were broken into liquid droplets with the deveolping of instability. Alcohol is broken faster than water.