Density contrast matters for drop fragmentation thresholds at low Ohnesorge number
Density contrast matters for drop fragmentation thresholds at low Ohnesorge number
复制标题
DOI：
10.1103/physrevfluids.4.103604
复制
发表时间：
2019-10-25
影响因子：
2.7
通讯作者：
Zaleski, Stephane
中科院分区：
文献类型：
--
作者：
Marcotte, Florence;Zaleski, Stephane
我们解决数值的变形和破碎动力学的一个单一的液滴受到脉冲加速的单向气流。液相和气相之间的密度比在10-2000范围内变化，并与最近的液滴破碎实验进行比较。我们表明，低Ohnesorge数的液-气密度对比显着修改的临界韦伯数的爆裂和剥离破碎制度之间的过渡，一方面，和下降破碎，另一方面。我们提出了一个简单的理论参数来预测过渡韦伯数作为密度对比度的函数，并表明小对比度的稳定影响可以解释为惯性效应在液滴拉伸和质心加速度之间的非线性耦合。
We address numerically the deformation and fragmentation dynamics of a single liquid drop subject to impulsive acceleration by a unidirectional gas stream. The density ratio between the liquid and gaseous phases is varied in the 10-2000 range and comparisons are made with recent drop breakup experiments. We show for low Ohnesorge numbers that the liquid-gas density contrast significantly modifies the critical Weber number for the transition between bursting and stripping fragmentation regimes, on the one hand, and for drop fragmentation, on the other hand. We suggest a simple theoretical argument to predict the transitional Weber number as a function of the density contrast and show that the stabilizing influence of small contrasts can be explained by inertial effects in the nonlinear coupling between drop stretching and centroid acceleration.