为探究圆柱绕流形成的尾涡对液滴聚并的影响,本文采用水平集方法,建立了W/O型乳状液在圆柱绕流场中的流动模型。通过分析圆柱直径、流速、电场强度变化而引起的分散相体积分数变化,研究了绕流场对水滴聚并的作用。对不同圆柱直径下的不...为探究圆柱绕流形成的尾涡对液滴聚并的影响,本文采用水平集方法,建立了W/O型乳状液在圆柱绕流场中的流动模型。通过分析圆柱直径、流速、电场强度变化而引起的分散相体积分数变化,研究了绕流场对水滴聚并的作用。对不同圆柱直径下的不同流速进行了研究,结果表明当流速为1 m/s时聚并效果最理想。在1 m/s速度下叠加不同的电场强度,当电场强度为6 k V/cm时液滴聚并效率最高。对比流场、静电场&流场、圆柱绕流、绕流场&静电场四种物理场下的最优工况,聚并效率从大到小的顺序为:联合场>圆柱绕流场>静电场>流场。展开更多
Ionic liquid electrospray(ILE) in an atmospheric environment is often accompanied by the gas discharge phenomenon. It interferes with the normal operation of the electrospray and the measurement of experimental parame...Ionic liquid electrospray(ILE) in an atmospheric environment is often accompanied by the gas discharge phenomenon. It interferes with the normal operation of the electrospray and the measurement of experimental parameters. In this study, electrospray experiments were conducted on the ionic liquid EMI-BF4. The observations revealed that the operating modes of the ionic liquid depend on the voltage polarity at high voltages. Additionally, a correspondence between the operating mode of ILE and the current signal in the circuit was established. The shape of the liquid cone formed at the needle tip bore a striking resemblance to the plume of corona discharge, suggesting that the motion trajectory of electrons influenced the curvature of the liquid cone. Steamer theory provided a clear explanation for the change in curvature as the voltage increased.展开更多
文摘为探究圆柱绕流形成的尾涡对液滴聚并的影响,本文采用水平集方法,建立了W/O型乳状液在圆柱绕流场中的流动模型。通过分析圆柱直径、流速、电场强度变化而引起的分散相体积分数变化,研究了绕流场对水滴聚并的作用。对不同圆柱直径下的不同流速进行了研究,结果表明当流速为1 m/s时聚并效果最理想。在1 m/s速度下叠加不同的电场强度,当电场强度为6 k V/cm时液滴聚并效率最高。对比流场、静电场&流场、圆柱绕流、绕流场&静电场四种物理场下的最优工况,聚并效率从大到小的顺序为:联合场>圆柱绕流场>静电场>流场。
基金supported by the National Key Research and Development Program of China(No.2020YFC2201004)National Natural Science Foundation of China(No.12172110)。
文摘Ionic liquid electrospray(ILE) in an atmospheric environment is often accompanied by the gas discharge phenomenon. It interferes with the normal operation of the electrospray and the measurement of experimental parameters. In this study, electrospray experiments were conducted on the ionic liquid EMI-BF4. The observations revealed that the operating modes of the ionic liquid depend on the voltage polarity at high voltages. Additionally, a correspondence between the operating mode of ILE and the current signal in the circuit was established. The shape of the liquid cone formed at the needle tip bore a striking resemblance to the plume of corona discharge, suggesting that the motion trajectory of electrons influenced the curvature of the liquid cone. Steamer theory provided a clear explanation for the change in curvature as the voltage increased.
