乳状液液滴在高压直流电场中的变形与破裂分析

Numerical analysis of deformation and break-up of aqueous drop of water-in-oil emulsion in high voltage D.C. fields

新型电脱水技术利用高压电场对乳状液中液滴的变形、聚合具有一定的影响,其中电场参数的选择对液滴变形和聚合效率具有显著影响。适度的液滴变形将促进液滴聚合,过度的变形则可能使液滴破裂成更多的小液滴而增加乳状液分离的难度。本文引入光滑粒子流体动力学方法,对电场强度的变化对液滴变形和破裂过程的影响进行了数值模拟分析。结果表明:电场强度一定程度的增大能提高液滴变形速度并加速其聚合,如果场强过高则液滴破裂;在同一电场强度作用下,粒径较小的液滴比粒径较大的液滴变形困难。

A new type of electric dehydration technology attracts many researchers' attention because it makes use of the influence of high pressure electric field on the droplet deformation and polymerization in the emulsion.The choice of the electric field parameter has a significant effect on the droplet deformation and polymerization efficiency.Moderate droplet deformation will promote droplet polymerization,excessive deformation may make droplet break into smaller droplet and increase the difficulty of the emulsion separation.In this paper the smooth particle of hydrodynamics method is introduced,the influence of electric intensity on droplet deformation is simulated and compared.Results show that the increasing of the strength of electric field to a certain extent can improve the droplet deformation velocity,and accelerate polymerization.If the field strength is too high,droplet will rupture.For the same electric field intensity,the droplets with smaller diameter are more difficult to deform than the one with large diameter.