Impingement and Mixing Dynamics of Micro-Droplets on a Solid Surface

Guina Yi; Ziqi Cai; Zhengming Gao; J J Derksen

doi:10.1016/j.cjche.2021.11.001

Impingement and Mixing Dynamics of Micro-Droplets on a Solid Surface

Guina Yi, Ziqi Cai^* (Corresponding Author), Zhengming Gao, J J Derksen

^*Corresponding author for this work

Engineering

Beijing University of Chemical Technology

Research output: Contribution to journal › Article › peer-review

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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 (θi) 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 τm 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 τm hardly changes with We and Oh. Whereas, θi and surface wettability are found to have a significant effect on τm. We find that θi has no clear effect on τm on a hydrophobic surface, while on the hydrophilic surface, τm increase with the θi . Thus, reducing the impinging angle is a valid method to shorten the total mixing time.

Original language	English
Pages (from-to)	66-77
Number of pages	12
Journal	Chinese Journal of Chemical Engineering
Volume	52
Early online date	12 Nov 2021
DOIs	https://doi.org/10.1016/j.cjche.2021.11.001
Publication status	Published - 1 Dec 2022

Bibliographical note

Supported from National Natural Science Foundation of China (No.22078008) and the Fundamental Research Funds for the Central Universities (XK1802-1).

Acknowledgement
The authors gratefully acknowledge the financial support from National Natural Science Foundation of China (No.22078008) and the Fundamental Research Funds for the Central Universities (XK1802-1).

Keywords

droplets impingement
mixing behavior
mixing time
concentration distribution
many-body dissipative particle dynamics

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title = "Impingement and Mixing Dynamics of Micro-Droplets on a Solid Surface",

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 (θi) 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 τm 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 τm hardly changes with We and Oh. Whereas, θi and surface wettability are found to have a significant effect on τm. We find that θi has no clear effect on τm on a hydrophobic surface, while on the hydrophilic surface, τm increase with the θi . Thus, reducing the impinging angle is a valid method to shorten the total mixing time.",

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author = "Guina Yi and Ziqi Cai and Zhengming Gao and Derksen, {J J}",

note = "Supported from National Natural Science Foundation of China (No.22078008) and the Fundamental Research Funds for the Central Universities (XK1802-1). Acknowledgement The authors gratefully acknowledge the financial support from National Natural Science Foundation of China (No.22078008) and the Fundamental Research Funds for the Central Universities (XK1802-1). ",

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AU - Yi, Guina

AU - Cai, Ziqi

AU - Gao, Zhengming

AU - Derksen, J J

N1 - Supported from National Natural Science Foundation of China (No.22078008) and the Fundamental Research Funds for the Central Universities (XK1802-1). Acknowledgement The authors gratefully acknowledge the financial support from National Natural Science Foundation of China (No.22078008) and the Fundamental Research Funds for the Central Universities (XK1802-1).

PY - 2022/12/1

Y1 - 2022/12/1

N2 - 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 (θi) 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 τm 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 τm hardly changes with We and Oh. Whereas, θi and surface wettability are found to have a significant effect on τm. We find that θi has no clear effect on τm on a hydrophobic surface, while on the hydrophilic surface, τm increase with the θi . Thus, reducing the impinging angle is a valid method to shorten the total mixing time.

AB - 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 (θi) 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 τm 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 τm hardly changes with We and Oh. Whereas, θi and surface wettability are found to have a significant effect on τm. We find that θi has no clear effect on τm on a hydrophobic surface, while on the hydrophilic surface, τm increase with the θi . Thus, reducing the impinging angle is a valid method to shorten the total mixing time.

KW - droplets impingement

KW - mixing behavior

KW - mixing time

KW - concentration distribution

KW - many-body dissipative particle dynamics

U2 - 10.1016/j.cjche.2021.11.001

DO - 10.1016/j.cjche.2021.11.001

M3 - Article

SN - 1004-9541

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SP - 66

EP - 77

JO - Chinese Journal of Chemical Engineering

JF - Chinese Journal of Chemical Engineering

ER -

Impingement and Mixing Dynamics of Micro-Droplets on a Solid Surface

Abstract

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Keywords

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