Dynamics and outcomes of binary collisions of equi-diameter picolitre droplets with identical viscosities.
Dynamics and outcomes of binary collisions of equi-diameter picolitre droplets with identical viscosities.
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具有相同粘度的等直径皮升液滴的二元碰撞的动力学和结果。
DOI：
10.1039/d2cp02613a
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
McCarthy LP
中科院分区：
文献类型：
--
作者：
McCarthy LP
实验研究了具有相同粘度、不同撞击速度和撞击角度的等直径皮升液滴的二元碰撞动力学，并与碰撞结果预测模型进行了比较。研究了粘度为0.89 mPa s的纯水滴对和粘度为5.17 mPa s的水-蔗糖（40% w/w）水滴对之间的碰撞。碰撞液滴的直径为~ 38 μm，比之前研究粘度对二元液滴碰撞结果的影响时所研究的液滴直径小约10倍。不同的碰撞速度和角度导致不同的碰撞结果，包括合并、反射分离和拉伸分离。碰撞结果绘制在两个粘度相关的状态图上。在高粘度和低粘度的情况下，状态边界通常与早期文献一致。对于这两种流体，实验和理论之间的一致性，使我们对这里测试的模型更有信心，来预测这种大小和这种粘度的液滴的碰撞结果。
The dynamics of binary collisions of equi-diameter picolitre droplets with identical viscosities, varying impact speeds and impact angles have been investigated experimentally and compared to collision outcome prediction models. Collisions between pairs of pure water droplets with a viscosity of 0.89 mPa s and pairs of aqueous-sucrose (40% w/w) droplets with a viscosity of 5.17 mPa s were examined. The colliding droplets were ∼38 μm in diameter, which is around ten times smaller than those previously investigated when examining the effect of viscosity on the outcome of binary droplet collisions. Varying the impact speed and angle resulted in different collision outcomes, including coalescence, reflexive separation and stretching separation. The collision outcomes were plotted on two viscosity dependent regime maps. The regime boundaries are generally in agreement with earlier literature for both high and low viscosity cases. The agreement between experiment and theory, for both fluids, gives more confidence in the models tested here to predict collision outcomes for droplets of this size and these viscosities.