液-液荷电液体界面的不稳定性分析OA

The ethanol was used as the dispersed phase liquid with soybean oil as the continuous phase liquid for a liquid-liquid system.Based on the interfacial wave instability theory,the dimensionless dispersion equation under the action of a needle-plate electrode was established and numerical calcula-tions were performed.Combined with the experimental measurement results,the interface wave charac-teristics that dominate the deformation and fragmentation of the discrete phase liquid,and the changing rule of the swing angle were analyzed.The results show that in the oscillating droplet mode,both axi-symmetric interfacial waves and non-axisymmetric interfacial waves coexist.Among them,the axisym-metric interfacial waves dominate the deformation and fragmentation of the discrete phase liquid.The maximum growth rate of the interface waves increases from 0.326 10 to 0.602 50,and the optimal wave numbers increase from 0.758 60 to 1.361 60 as the applied voltage increases from 1.34 kV to 2.88 kV.Meanwhile,the non-axisymmetric interfacial waves influence the motion trajectory of the charged drop-lets,so that the droplets generated successively are distributed on the left and right sides of the capil-lary axis.Within the same applied voltage range,the maximum growth rate of the interface waves for the non-axisymmetric waves increases from 0.020 27 to 0.493 50,and the optimal wave numbers in-creases from 0.065 80 to 0.937 50.The angle between the lines connecting the centers of the droplets,the swing angle,increases with applied voltage.The wave inclination angle is used to characterize the droplet swing angle,and the average result calculated by the ratio method and the substitution method is adopted as the theoretical value.The calculated results deviate from the experimental values by less than 6%,accurately reflecting the actual trajectory of the droplets.