Numerical simulation of a falling droplet surrounding by air under electric field using VOF method: A CFD study

doi:10.1016/j.cjche.2020.07.048

中国化学工程学报 ›› 2020, Vol. 28 ›› Issue (12): 2977-2984.DOI: 10.1016/j.cjche.2020.07.048

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

Numerical simulation of a falling droplet surrounding by air under electric field using VOF method: A CFD study

Mirollah Hosseini¹, Hossein Arasteh², Hamid Hassanzadeh Afrouzi³, Davood Toghraie⁴

1 Department of Mechanical Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Mazandaran, Iran;
2 Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran;
3 Babol Noshirvani University of Technology, Babol, Iran;
4 Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran

收稿日期:2019-12-06 修回日期:2020-07-05 出版日期:2020-12-28 发布日期:2021-01-11
通讯作者: Mirollah Hosseini, Davood Toghraie

Numerical simulation of a falling droplet surrounding by air under electric field using VOF method: A CFD study

Mirollah Hosseini¹, Hossein Arasteh², Hamid Hassanzadeh Afrouzi³, Davood Toghraie⁴

1 Department of Mechanical Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Mazandaran, Iran;
2 Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran;
3 Babol Noshirvani University of Technology, Babol, Iran;
4 Department of Mechanical Engineering, Khomeinishahr Branch, Islamic Azad University, Khomeinishahr, Iran

Received:2019-12-06 Revised:2020-07-05 Online:2020-12-28 Published:2021-01-11
Contact: Mirollah Hosseini, Davood Toghraie

摘要/Abstract

摘要： This is a numerical study of a falling droplet surrounding by air under the electric field modeled with finite volume method by means of CFD. The VOF method has been employed to model the two-phase flow of the present study. Various capillary numbers are investigated to analyze the effects of electric field intensity on the falling droplet deformation. Also, the effects of electric potential on the heat transfer coefficient have been examined. The obtained results showed that by applying the electric field at a capillary number of 0.2 the droplet tends to retain its primitive shape as time goes by, with a subtle deformation to an oblate form. Intensifying the electric field to a capillary number of 0.8 droplet deformation is almost insignificant with time progressing; however, further enhancement in capillary number to 2 causes the droplet to deform as a prolate shape and higher values of this number intensify the prolate form deformation of the droplet and result in pinch-off phenomenon. Ultimately, it is showed that as the electric potential augments the heat transfer coefficient increases in which for electric potential values higher than 2400 V the heat transfer coefficient enhances significantly.

关键词: Two-phase flow, VOF method, Falling droplet, Electric field, CFD study

Abstract: This is a numerical study of a falling droplet surrounding by air under the electric field modeled with finite volume method by means of CFD. The VOF method has been employed to model the two-phase flow of the present study. Various capillary numbers are investigated to analyze the effects of electric field intensity on the falling droplet deformation. Also, the effects of electric potential on the heat transfer coefficient have been examined. The obtained results showed that by applying the electric field at a capillary number of 0.2 the droplet tends to retain its primitive shape as time goes by, with a subtle deformation to an oblate form. Intensifying the electric field to a capillary number of 0.8 droplet deformation is almost insignificant with time progressing; however, further enhancement in capillary number to 2 causes the droplet to deform as a prolate shape and higher values of this number intensify the prolate form deformation of the droplet and result in pinch-off phenomenon. Ultimately, it is showed that as the electric potential augments the heat transfer coefficient increases in which for electric potential values higher than 2400 V the heat transfer coefficient enhances significantly.

Key words: Two-phase flow, VOF method, Falling droplet, Electric field, CFD study

Mirollah Hosseini, Hossein Arasteh, Hamid Hassanzadeh Afrouzi, Davood Toghraie. Numerical simulation of a falling droplet surrounding by air under electric field using VOF method: A CFD study[J]. 中国化学工程学报, 2020, 28(12): 2977-2984.

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Numerical simulation of a falling droplet surrounding by air under electric field using VOF method: A CFD study

Numerical simulation of a falling droplet surrounding by air under electric field using VOF method: A CFD study

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