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arXiv 2307.05720physics.flu-dyn
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两个碰撞的不混溶液体液滴迎头分离后的液体分布

Liquid distribution after head-on separation of two colliding immiscible liquid droplets

Johanna Potyka, Kathrin Schulte, Carole Planchette

AI总结:

本文研究了两个不混溶液滴迎头碰撞分离后子液滴的三种液体分布类型,基于碰撞的径向延伸与弛豫两阶段推导出两个无量纲参数,其组合能准确预测液体分布类型且与实验和模拟结果高度吻合。

摘要:

两个不混溶液体液滴的迎头碰撞会形成一个碰撞复合体,该复合体可能以单个复合液滴的形式保持稳定,也可能碎裂成两个主要的子液滴。本文研究了在两个子液滴中形成的液体分布,该分布可分为三种类型。要么形成两个包覆液滴(单次反射分离),要么形成一个单一包覆液滴加上一个完全由包覆液体构成的液滴,后者既可以在撞击侧找到(反射分离),也可以在撞击对侧找到(交叉分离)。本文分析了涵盖部分和完全润湿条件,且 Weber 数和 Reynolds 数分别在 2-720 和 66-1100 范围内的大量实验和模拟数据。基于将碰撞分解为两个阶段:(i) 复合液滴径向延伸成液膜,以及 (ii) 其弛豫成拉长的圆柱形液滴,本文识别并描述了导致上述三种液体分布的条件。与这两个阶段相对应,推导出了两个无量纲参数,$Λ= {ρ_i/ρ_o} {{We_i}^{-1/2}}$ 和 $N = {ν_o/ν_i}~{σ_{o}/σ_{io}}$,它们仅基于内包覆液滴 (i) 和外液滴 (o) 的碰撞参数和液体性质构建。与所提出的解释一致,这两个参数的组合预测了液体分布的类型。发现该预测与实验和数值结果均非常吻合。

英文摘要:

Head-on collisions of two immiscible liquid droplets lead to a collision complex, which may either remain stable in the form of a single compound drop, or fragment into two main daughter droplets. This paper investigates the liquid distribution developing in the two daughter droplets and which can be of three types. Either two encapsulated droplets (single reflex separation) form, or a single encapsulated drop plus a droplet made solely of the encapsulating liquid, which can be found either on the impact side (reflexive separation) or opposite to it (crossing separation). A large number of experimental and simulation data covering collisions with partial and total wetting conditions and with Weber and Reynolds numbers in the ranges of 2 - 720 and 66 - 1100, respectively, is analyzed. The conditions leading to the three mentioned liquid distributions are identified and described based on the decomposition of the collision in two phases: (i) radial extension of the compound droplet into a lamella and (ii) its relaxation into an elongated cylindrical droplet. In accordance with these two phases, two dimensionless parameters, $Λ= {ρ_i/ρ_o} {{We_i}^{-1/2}}$ and $N = {ν_o/ν_i}~{σ_{o}/σ_{io}}$, are derived, which are built on the collision parameters and liquid properties of the encapsulated inner droplet (i) and the outer droplet (o) only. In agreement with the proposed interpretation, the combination of these two parameters predicts the type of liquid distribution. The predictions are found to be in very good agreement with both experimental and numerical results.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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