Asymmetric Jetting during the Impact of Liquid Drops on Superhydrophobic Concave Surfaces

Chengmin Chen; Hongjun Zhong; Zhe Liu; Jianchun Wang; Jianmei Wang; Guangxia Liu; Yan Li; Pingan Zhu

doi:10.3390/mi13091521

Asymmetric Jetting during the Impact of Liquid Drops on Superhydrophobic Concave Surfaces

Chengmin Chen, Hongjun Zhong, Zhe Liu, Jianchun Wang, Jianmei Wang, Guangxia Liu, Yan Li, Pingan Zhu^*

^*Corresponding author for this work

Department of Mechanical Engineering

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

4 Citations (Scopus)

52 Downloads (CityUHK Scholars)

Abstract

The impact of liquid drops on superhydrophobic solid surfaces is ubiquitous and of practical importance in many industrial processes. Here, we study the impingement of droplets on superhydrophobic surfaces with a macroscopic dimple structure, during which the droplet exhibits asymmetric jetting. Systematic experimental investigations and numerical simulations provide insight into the dynamics and underlying mechanisms of the observed phenomenon. The observation is a result of the interaction between the spreading droplet and the dimple. An upward internal flow is induced by the dimple, which is then superimposed on the horizontal flow inside the spreading droplet. As such, an inclined jet is issued asymmetrically into the air. This work would be conducive to the development of an open-space microfluidic platform for droplet manipulation and generation.

Original language	English
Article number	1521
Journal	Micromachines
Volume	13
Issue number	9
Online published	14 Sept 2022
DOIs	https://doi.org/10.3390/mi13091521
Publication status	Published - Sept 2022

Funding

This research was funded by the Research Grants Council of Hong Kong (ECS 21213621), City University of Hong Kong (9610502 and 7005936), the Open Project of State Key Laboratory of Crystal Materials, Shandong University (KF2014), Key research and development plan in Shandong province (2019GHZ018), National Talent Program (G2022024003L) and Shandong Provincial Key Research and Development Program (Major Technological Innovation Project) (2021CXGC010515).

Research Keywords

asymmetric jetting
droplet impact
droplet manipulation
superhydrophobic surface

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This full text is made available under CC-BY 4.0. https://creativecommons.org/licenses/by/4.0/

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title = "Asymmetric Jetting during the Impact of Liquid Drops on Superhydrophobic Concave Surfaces",

abstract = "The impact of liquid drops on superhydrophobic solid surfaces is ubiquitous and of practical importance in many industrial processes. Here, we study the impingement of droplets on superhydrophobic surfaces with a macroscopic dimple structure, during which the droplet exhibits asymmetric jetting. Systematic experimental investigations and numerical simulations provide insight into the dynamics and underlying mechanisms of the observed phenomenon. The observation is a result of the interaction between the spreading droplet and the dimple. An upward internal flow is induced by the dimple, which is then superimposed on the horizontal flow inside the spreading droplet. As such, an inclined jet is issued asymmetrically into the air. This work would be conducive to the development of an open-space microfluidic platform for droplet manipulation and generation.",

keywords = "asymmetric jetting, droplet impact, droplet manipulation, superhydrophobic surface",

author = "Chengmin Chen and Hongjun Zhong and Zhe Liu and Jianchun Wang and Jianmei Wang and Guangxia Liu and Yan Li and Pingan Zhu",

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volume = "13",

journal = "Micromachines",

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TY - JOUR

T1 - Asymmetric Jetting during the Impact of Liquid Drops on Superhydrophobic Concave Surfaces

AU - Chen, Chengmin

AU - Zhong, Hongjun

AU - Liu, Zhe

AU - Wang, Jianchun

AU - Wang, Jianmei

AU - Liu, Guangxia

AU - Li, Yan

AU - Zhu, Pingan

PY - 2022/9

Y1 - 2022/9

N2 - The impact of liquid drops on superhydrophobic solid surfaces is ubiquitous and of practical importance in many industrial processes. Here, we study the impingement of droplets on superhydrophobic surfaces with a macroscopic dimple structure, during which the droplet exhibits asymmetric jetting. Systematic experimental investigations and numerical simulations provide insight into the dynamics and underlying mechanisms of the observed phenomenon. The observation is a result of the interaction between the spreading droplet and the dimple. An upward internal flow is induced by the dimple, which is then superimposed on the horizontal flow inside the spreading droplet. As such, an inclined jet is issued asymmetrically into the air. This work would be conducive to the development of an open-space microfluidic platform for droplet manipulation and generation.

AB - The impact of liquid drops on superhydrophobic solid surfaces is ubiquitous and of practical importance in many industrial processes. Here, we study the impingement of droplets on superhydrophobic surfaces with a macroscopic dimple structure, during which the droplet exhibits asymmetric jetting. Systematic experimental investigations and numerical simulations provide insight into the dynamics and underlying mechanisms of the observed phenomenon. The observation is a result of the interaction between the spreading droplet and the dimple. An upward internal flow is induced by the dimple, which is then superimposed on the horizontal flow inside the spreading droplet. As such, an inclined jet is issued asymmetrically into the air. This work would be conducive to the development of an open-space microfluidic platform for droplet manipulation and generation.

KW - asymmetric jetting

KW - droplet impact

KW - droplet manipulation

KW - superhydrophobic surface

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U2 - 10.3390/mi13091521

DO - 10.3390/mi13091521

M3 - RGC 21 - Publication in refereed journal

C2 - 36144146

SN - 2072-666X

VL - 13

JO - Micromachines

JF - Micromachines

IS - 9

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ER -

Asymmetric Jetting during the Impact of Liquid Drops on Superhydrophobic Concave Surfaces

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Research Keywords

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ECS: Bioinspired Soft Microactuators by Droplet Microfluidics

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Asymmetric Jetting during the Impact of Liquid Drops on Superhydrophobic Concave Surfaces

Abstract

Funding

Research Keywords

Publisher's Copyright Statement

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ECS: Bioinspired Soft Microactuators by Droplet Microfluidics

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