双液滴热毛细迁移的实验研究

EXPERIMENTAL INVESTIGATION OF THERMOCAPILLARY MIGRATION OF TWO DROPS

在地面实验中,研究在竖直向上温度梯度流场中,双液滴的热毛细迁移运动和它们间的相互作用.豆油和硅油分别作为实验系统的母液和液滴.液滴迁移轨迹被记录和分析.实验结果表明,大小液滴的实验迁移速度均小于理论迁移速度;两个液滴之间的相互作用对小液滴的影响更为明显,使之出现倾斜"8"字的迁移轨迹;两个液滴的运动速度都出现了振荡现象,小液滴可能出现短时反向迁移.实验结果与数值模拟结果较为相似,但尚有差异,需要进一步进行研究.

Experiments were performed on the migration and interaction of two drops under the action of an applied temperature gradient on the ground. Pure soybean oil and silicon oil were used as continuous medium and as experimental medium in drops respectively. Images of these experiments were recorded and later analyzed to obtain data on the trajectories and velocities of two drops. The results demonstrate that the effect of the larger drop on the motion of the smaller one becomes significant with the two drops approaching each other, while the effect of the smaller one on the larger remains weak. And the oscillation phenomenon of migration velocities of both drops is found during the approach. Even the smaller one moves backwards in a short time when two drops migrate side by side. They display the congruence and difference between the experimental results and numerical simulations.