Giglio E, Rangama J, Guillous S, Le Cornu T
Centre de Recherche sur les Ions, les Matériaux et la Photonique, Université de Caen Normandie, ENSICAEN, CEA, CNRS, 14000 Caen, France.
Phys Rev E. 2020 Jan;101(1-1):013105. doi: 10.1103/PhysRevE.101.013105.
In this work, we model and simulate the shape evolution of critically charged droplets, from the initial spherical shape to the charge emission and back to the spherical shape. The shape deformation is described using the viscous correction for viscous potential flow model, which is a potential flow approximation of the Navier-Stokes equation for incompressible Newtonian fluids. The simulated shapes are compared to snapshots of experimentally observed drop deformations. We highlight the influence of the dimensionless viscosity and charge carrier mobility of the liquid on the shape evolution of droplets and discuss the observed trends. We give an explanation as to why the observed deformation pathways of positively and negatively charged pure water droplets differ and give a hint as to why negatively charged water droplets emit more charge during charge breakup than positively charged ones.
在这项工作中，我们对临界带电液滴的形状演变进行建模和模拟，从初始的球形开始，经历电荷发射，然后再回到球形。形状变形是使用粘性势流模型的粘性校正来描述的，该模型是不可压缩牛顿流体的纳维 - 斯托克斯方程的势流近似。将模拟形状与实验观察到的液滴变形的快照进行比较。我们强调了液体的无量纲粘度和电荷载流子迁移率对液滴形状演变的影响，并讨论了观察到的趋势。我们解释了为什么观察到的带正电和带负电的纯水液滴的变形路径不同，以及为什么带负电的水滴在电荷分裂过程中比带正电的水滴发射更多电荷。
