Droplet impingement and wetting behavior on a chemically heterogeneous surface in the Beyond-Cassie-Baxter regime

Guina Yi; Ziqi Cai; Zhengming Gao; Zhichao Jiang; Xiongbin Huang; J. J. Derksen

doi:10.1002/aic.16263

Droplet impingement and wetting behavior on a chemically heterogeneous surface in the Beyond-Cassie-Baxter regime

Guina Yi, Ziqi Cai^*, Zhengming Gao^*, Zhichao Jiang, Xiongbin Huang, J. J. Derksen

^*Corresponding author for this work

Engineering

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

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Abstract

Droplet impingement and anisotropic wetting on chemically heterogeneous stripe-patterned surfaces is simulated by means of many-body dissipative particle dynamics (MDPD). The ratio of the stripe width and initial droplet diameter, defined as β, ranges from 0.5 to 1.0 so that the wetting process is in the Beyond-Cassie-Baxter regime and is highly anisotropic. At zero Weber number (that is, without considering droplet inertia) and with superhydrophobic stripes, β is the only factor affecting the droplet perpendicular contact angle and aspect ratio. For inertial droplets, β and the Weber number are found to have an effect on the eventual droplet morphology on multi-striped surfaces. These morphologies include elongated shape, split-off, and “butterfly” shape. A correlation for critical split-off conditions has been determined. An energy analysis of droplet impingement shows that the normalized surface energy of the droplet is independent of the Weber number if the droplet is elongated or butterfly-shaped.

Original language	English
Article number	e16263
Number of pages	13
Journal	AIChE Journal
Volume	66
Issue number	8
Early online date	9 Jun 2020
DOIs	https://doi.org/10.1002/aic.16263
Publication status	Published - Aug 2020

Keywords

Anisotropic wetting
droplet impingement
many-body dissipative particle dynamics
droplet evolution
surface energy
anisotropic wetting
SHAPES
TENSION
VISCOSITY
SIMULATION
ANISOTROPY
IMPACT
COALESCENCE
KINETICS
DYNAMICS

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Yi_et_al_AICHeJ_DropletImpingementandWetting_AAM
This is the peer reviewed version of the following article: Yi, G, Cai, Z, Gao, Z, Jiang, Z, Huang, X, Derksen, JJ. Droplet impingement and wetting behavior on a chemically heterogeneous surface in the Beyond–Cassie–Baxter regime. AIChE J. 2020; 66:e16263., which has been published in final form at https://doi.org/10.1002/aic.16263. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.
Accepted author manuscript, 3.81 MBLicence: Unspecified

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title = "Droplet impingement and wetting behavior on a chemically heterogeneous surface in the Beyond-Cassie-Baxter regime",

abstract = "Droplet impingement and anisotropic wetting on chemically heterogeneous stripe-patterned surfaces is simulated by means of many-body dissipative particle dynamics (MDPD). The ratio of the stripe width and initial droplet diameter, defined as β, ranges from 0.5 to 1.0 so that the wetting process is in the Beyond-Cassie-Baxter regime and is highly anisotropic. At zero Weber number (that is, without considering droplet inertia) and with superhydrophobic stripes, β is the only factor affecting the droplet perpendicular contact angle and aspect ratio. For inertial droplets, β and the Weber number are found to have an effect on the eventual droplet morphology on multi-striped surfaces. These morphologies include elongated shape, split-off, and “butterfly” shape. A correlation for critical split-off conditions has been determined. An energy analysis of droplet impingement shows that the normalized surface energy of the droplet is independent of the Weber number if the droplet is elongated or butterfly-shaped. ",

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author = "Guina Yi and Ziqi Cai and Zhengming Gao and Zhichao Jiang and Xiongbin Huang and Derksen, {J. J.}",

year = "2020",

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language = "English",

volume = "66",

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AU - Yi, Guina

AU - Cai, Ziqi

AU - Gao, Zhengming

AU - Jiang, Zhichao

AU - Huang, Xiongbin

AU - Derksen, J. J.

PY - 2020/8

Y1 - 2020/8

N2 - Droplet impingement and anisotropic wetting on chemically heterogeneous stripe-patterned surfaces is simulated by means of many-body dissipative particle dynamics (MDPD). The ratio of the stripe width and initial droplet diameter, defined as β, ranges from 0.5 to 1.0 so that the wetting process is in the Beyond-Cassie-Baxter regime and is highly anisotropic. At zero Weber number (that is, without considering droplet inertia) and with superhydrophobic stripes, β is the only factor affecting the droplet perpendicular contact angle and aspect ratio. For inertial droplets, β and the Weber number are found to have an effect on the eventual droplet morphology on multi-striped surfaces. These morphologies include elongated shape, split-off, and “butterfly” shape. A correlation for critical split-off conditions has been determined. An energy analysis of droplet impingement shows that the normalized surface energy of the droplet is independent of the Weber number if the droplet is elongated or butterfly-shaped.

AB - Droplet impingement and anisotropic wetting on chemically heterogeneous stripe-patterned surfaces is simulated by means of many-body dissipative particle dynamics (MDPD). The ratio of the stripe width and initial droplet diameter, defined as β, ranges from 0.5 to 1.0 so that the wetting process is in the Beyond-Cassie-Baxter regime and is highly anisotropic. At zero Weber number (that is, without considering droplet inertia) and with superhydrophobic stripes, β is the only factor affecting the droplet perpendicular contact angle and aspect ratio. For inertial droplets, β and the Weber number are found to have an effect on the eventual droplet morphology on multi-striped surfaces. These morphologies include elongated shape, split-off, and “butterfly” shape. A correlation for critical split-off conditions has been determined. An energy analysis of droplet impingement shows that the normalized surface energy of the droplet is independent of the Weber number if the droplet is elongated or butterfly-shaped.

KW - Anisotropic wetting

KW - droplet impingement

KW - many-body dissipative particle dynamics

KW - droplet evolution

KW - surface energy

KW - anisotropic wetting

KW - SHAPES

KW - TENSION

KW - VISCOSITY

KW - SIMULATION

KW - ANISOTROPY

KW - IMPACT

KW - COALESCENCE

KW - KINETICS

KW - DYNAMICS

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DO - 10.1002/aic.16263

M3 - Article

SN - 0001-1541

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JO - AIChE Journal

JF - AIChE Journal

IS - 8

M1 - e16263

ER -

Droplet impingement and wetting behavior on a chemically heterogeneous surface in the Beyond-Cassie-Baxter regime

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