Impingement and mixing dynamics of micro-droplets on a solid surface

doi:10.1016/j.cjche.2021.11.001

Chinese Journal of Chemical Engineering ›› 2022, Vol. 52 ›› Issue (12): 66-77.DOI: 10.1016/j.cjche.2021.11.001

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Impingement and mixing dynamics of micro-droplets on a solid surface

Guina Yi^1,2, Ziqi Cai^1,2, Zhengming Gao^1,2, J.J. Derksen³

1. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2. State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
3. School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK

Received:2021-07-30 Revised:2021-10-28 Online:2023-01-31 Published:2022-12-28
Contact: Ziqi Cai,E-mail:caiziqi@mail.buct.edu.cn;Zhengming Gao,E-mail:gaozm@mail.buct.edu.cn
Supported by:
The authors gratefully acknowledge the financial support from National Natural Science Foundation of China (22078008, 22178014) and the Fundamental Research Funds for the Central Universities (XK1802-1).

Impingement and mixing dynamics of micro-droplets on a solid surface

Guina Yi^1,2, Ziqi Cai^1,2, Zhengming Gao^1,2, J.J. Derksen³

1. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
2. State Key Laboratory of Chemical Resource Engineering, School of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China;
3. School of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK

通讯作者: Ziqi Cai,E-mail:caiziqi@mail.buct.edu.cn;Zhengming Gao,E-mail:gaozm@mail.buct.edu.cn
基金资助:
The authors gratefully acknowledge the financial support from National Natural Science Foundation of China (22078008, 22178014) and the Fundamental Research Funds for the Central Universities (XK1802-1).

Abstract

Abstract: The hydrodynamics and mixing during the nonaxisymmetry impingement of a micro-droplet and a sessile droplet of the same fluid are investigated by many-body dissipative particle dynamics (MDPD) simulation. In this work, the range of the impingement angle (θ_i) between the impinging droplet and the sessile droplet is 0°–60° and the contact angle is set as 45° or 124°. The droplets impingement and mixing behavior is analyzed based on the droplet internal flow field, the concentration distribution and the time scale of the decay of the kinetic energy of the impinging droplet. The dimensionless total mixing time (τ_m) is calculated by a modified mixing function. With the Weber number (We) ranging from 5.65 to 22.7 and the Ohnesorge number (Oh) ranging from 0.136 to 0.214, we find τ_m hardly changes with We and Oh. Whereas, θ_i and surface wettability are found to have a significant effect on τ_m. We find that θ_i has no clear effect on τ_m on a hydrophobic surface, while on the hydrophilic surface, τ_m increase with the θ_i. Thus, reducing the impinging angle is a valid method to shorten the τ_m.

Key words: Droplets impingement, Mixing behavior, Mixing time, Concentration distribution, Many-body dissipative particle dynamics

摘要： The hydrodynamics and mixing during the nonaxisymmetry impingement of a micro-droplet and a sessile droplet of the same fluid are investigated by many-body dissipative particle dynamics (MDPD) simulation. In this work, the range of the impingement angle (θ_i) between the impinging droplet and the sessile droplet is 0°–60° and the contact angle is set as 45° or 124°. The droplets impingement and mixing behavior is analyzed based on the droplet internal flow field, the concentration distribution and the time scale of the decay of the kinetic energy of the impinging droplet. The dimensionless total mixing time (τ_m) is calculated by a modified mixing function. With the Weber number (We) ranging from 5.65 to 22.7 and the Ohnesorge number (Oh) ranging from 0.136 to 0.214, we find τ_m hardly changes with We and Oh. Whereas, θ_i and surface wettability are found to have a significant effect on τ_m. We find that θ_i has no clear effect on τ_m on a hydrophobic surface, while on the hydrophilic surface, τ_m increase with the θ_i. Thus, reducing the impinging angle is a valid method to shorten the τ_m.

关键词: Droplets impingement, Mixing behavior, Mixing time, Concentration distribution, Many-body dissipative particle dynamics

Guina Yi, Ziqi Cai, Zhengming Gao, J.J. Derksen. Impingement and mixing dynamics of micro-droplets on a solid surface[J]. Chinese Journal of Chemical Engineering, 2022, 52(12): 66-77.

Guina Yi, Ziqi Cai, Zhengming Gao, J.J. Derksen. Impingement and mixing dynamics of micro-droplets on a solid surface[J]. 中国化学工程学报, 2022, 52(12): 66-77.

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Impingement and mixing dynamics of micro-droplets on a solid surface

Impingement and mixing dynamics of micro-droplets on a solid surface

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