In the present study, the impingement process of alginate droplet on an immiscible liquid is investigated using experimental and numerical approaches. The results reveal that the intensity of interaction between the two immiscible liquids leads to formation of different droplet shapes after impingement. The droplet yield stress, Ohnesorge number (Oh), and Weber number (We) were found to be the chief parameters which determine the droplet shape after impingement. Three discernible shapes of droplets could be identified from the present investigation: (i) spherical ball, (ii) spherical ball with a tail, and (iii) a toroidal shape. A detailed parameter regime map has been constructed which aids in identifying these three droplet shapes in well-defined range of Oh and We. Besides, the numerical investigations carried out also helped in deciphering the temporal evolution of the pressure, velocity and kinetic energy fields associated with the drop impingement process.

中文翻译：

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海藻酸钠液滴撞击不混溶深液表面的实验和CFD研究

在本研究中，使用实验和数值方法研究了海藻酸盐液滴对不混溶液体的撞击过程。结果表明，两种不混溶液体之间的相互作用强度导致碰撞后形成不同的液滴形状。发现液滴屈服应力、Ohnesorge 数 ( Oh ) 和 Weber 数 ( We ) 是确定撞击后液滴形状的主要参数。从目前的调查中可以确定三种可辨别的液滴形状：（i）球形，（ii）带尾巴的球形，和（iii）环形。已经构建了一个详细的参数状态图，有助于在Oh的明确定义范围内识别这三种液滴形状和我们。此外，所进行的数值研究还有助于破译与液滴撞击过程相关的压力、速度和动能场的时间演变。