Movement of dispersed droplets ofW/O emulsion in a uniform DC electrostatic field: Simulation on droplet coalescence

doi:10.1016/j.cjche.2015.07.007

›› 2015, Vol. 23 ›› Issue (9): 1453-1459.DOI: 10.1016/j.cjche.2015.07.007

Movement of dispersed droplets ofW/O emulsion in a uniform DC electrostatic field: Simulation on droplet coalescence

Jun Zhang^1,2

1 Cleaning Combustion and Energy Utilization Research Center of Fujian Province, China;
2 Fujian Province Key Lab of Energy Cleaning Utilization and Development, School of Mechanical Engineering, Jimei University, Xiamen 361021, China

收稿日期:2015-03-17 修回日期:2015-06-16 出版日期:2015-09-28 发布日期:2015-10-24
通讯作者: Jun Zhang
基金资助:
Supported by the Special Research Project of Fujian Province (JK2012027) and the Natural Science Foundation of Fujian Province (2014J01201).

Movement of dispersed droplets ofW/O emulsion in a uniform DC electrostatic field: Simulation on droplet coalescence

Jun Zhang^1,2

1 Cleaning Combustion and Energy Utilization Research Center of Fujian Province, China;
2 Fujian Province Key Lab of Energy Cleaning Utilization and Development, School of Mechanical Engineering, Jimei University, Xiamen 361021, China

Received:2015-03-17 Revised:2015-06-16 Online:2015-09-28 Published:2015-10-24
Supported by:
Supported by the Special Research Project of Fujian Province (JK2012027) and the Natural Science Foundation of Fujian Province (2014J01201).

摘要/Abstract

摘要： Considering the droplet coalescence, themotion of a group of dispersed droplets inW/O emulsion in a DC electric field is simulated. The simulation demonstrates the evolutions of droplet number, size as well as its distribution, local concentration distribution and droplet size-velocity relationwith the applied time of electric field. The simulated average droplet size is roughly consistent with the experimental value. The simulated variation of droplet number with time under several applied voltages shows that increasing voltage is more effective for raising the rate of droplet coalescence than extending exerting time. However, with the further raise of applied voltage, the improvement in droplet coalescence rate becomes less significant. The evolution of simulated droplet size- velocity relationship with time shows that the inter-droplet electric repulsion force is very strong due to larger electric charge on the droplet under higher applied voltage, so that the magnitude and the direction of droplet velocity become more random, which looks helpful to droplet coalescence.

关键词: DC electrostatic dehydration, Droplet coalescence, Droplet dynamics, Simulation

Abstract: Considering the droplet coalescence, themotion of a group of dispersed droplets inW/O emulsion in a DC electric field is simulated. The simulation demonstrates the evolutions of droplet number, size as well as its distribution, local concentration distribution and droplet size-velocity relationwith the applied time of electric field. The simulated average droplet size is roughly consistent with the experimental value. The simulated variation of droplet number with time under several applied voltages shows that increasing voltage is more effective for raising the rate of droplet coalescence than extending exerting time. However, with the further raise of applied voltage, the improvement in droplet coalescence rate becomes less significant. The evolution of simulated droplet size- velocity relationship with time shows that the inter-droplet electric repulsion force is very strong due to larger electric charge on the droplet under higher applied voltage, so that the magnitude and the direction of droplet velocity become more random, which looks helpful to droplet coalescence.

Key words: DC electrostatic dehydration, Droplet coalescence, Droplet dynamics, Simulation

Jun Zhang. Movement of dispersed droplets ofW/O emulsion in a uniform DC electrostatic field: Simulation on droplet coalescence[J]. , 2015, 23(9): 1453-1459.

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Movement of dispersed droplets ofW/O emulsion in a uniform DC electrostatic field: Simulation on droplet coalescence

Movement of dispersed droplets ofW/O emulsion in a uniform DC electrostatic field: Simulation on droplet coalescence

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