arXiv 2106.050332021-06-09physics.flu-dyn

弹性液滴与薄圆柱体的碰撞

Collision of elastic drop with thin cylinder

Alla O. Rudenko, Alexey I. Fedyushkin, Aleksey N. Rozhkov

摘要：

研究了水和弹性液滴与圆柱（螺纹）的碰撞问题。液滴飞行轨迹与圆柱轴线相互垂直。注意力集中在水滴和弹性流体的水滴之间的碰撞的差异。在实验中，液滴直径为3 mm，水平不锈钢圆柱体的直径为0.4和0.8 mm。液滴是通过将液体缓慢泵送通过外径为0.8 mm的垂直不锈钢毛细管形成的，液滴在重力作用下从毛细管中周期性地脱离。碰撞前的液滴速度由毛细管切口和目标（圆柱体）之间的距离定义;在实验中，该距离约为5、10和20 mm。撞击前的液滴速度估计在0.2-0.5 m/s的范围内。碰撞过程通过帧速率为240和960 Hz的高速视频记录方法进行监测。测试液体是水和分子量为1100万且浓度为100和1000 ppm的聚丙烯酰胺（PAM-100和PAM-1 k）的水溶液。实验表明，根据液滴冲击高度和聚合物浓度，液滴与薄圆柱体碰撞的不同情况是可能的：液滴从障碍物的短期反冲，液滴在保持液滴连续性的同时围绕圆柱形障碍物流动，液滴分裂成两个次级液滴，其中一个可以继续飞行，另一个被圆柱体捕获，或者两个次级液滴继续飞行，液滴也可以被圆筒捕获，直到下一个液滴的冲击迫使积聚的液滴从圆筒分离。数值模拟令人满意地再现了实验中观察到的现象。

英文摘要：

The collision of water and elastic liquid drops with a thin cylinder (thread) is studied. The droplet flight trajectory and the cylinder axis are mutually perpendicular. Attention is focused on the difference between collisions of water drops and drops of elastic fluids. In the experiments, the drop diameter was 3 mm, the diameter of horizontal stainless steel cylinders was 0.4 and 0.8 mm. The drops were formed by slowly pumping liquid through a vertical stainless steel capillary with an outer diameter of 0.8 mm, from which droplets were periodically detached under the action of gravity. The droplet velocity before collision was defined by the distance between the capillary cut and the target (cylinder); in experiments, this distance was approximately 5, 10, and 20 mm. The drop velocities before impact are estimated in the range of 0.2-0.5 m/s. The collision process was monitored by high-speed video recording methods with a frame rate of 240 and 960 Hz. The test liquids were water and aqueous solutions of polyacrylamide of molecular weight 11 million and concentrations of 100 and 1000 ppm (PAM-100 and PAM-1k). Experiments have shown that, depending on the drop impact height and polymer concentration, different scenarios of a drop collision with a thin cylinder are possible: a short-term recoil of a drop from an obstacle, a drop flowing around a cylindrical obstacle while maintaining the continuity of the drop, the breakup of a drop into two secondary drops, one of which can continue flight and the other one is captured by the cylinder, or both secondary droplets continue to fly, the drop also can be captured by the cylinder, until the impact of the next drop(s) forces the accumulated drop detach from the cylinder. Numerical modeling satisfactorily reproduces the phenomena observed in the experiment.

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摘要：

英文摘要：

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