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Polydimethylsiloxane-polycarbonate Microfluidic Devices for Cell Migration Studies Under Perpendicular Chemical and Oxygen Gradients

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A numerical study on viscoelastic droplet migration on a solid substrate due to wettability gradient.

Fan Bai¹, Yuke Li², Hongna Zhang³

¹School of Mechanical Engineering, Yeungnam University, Gyeongsan, South Korea.

Electrophoresis

|December 5, 2018

Summary

Viscoelastic droplet migration on wettability gradients is enhanced by elasticity. Higher elasticity increases droplet mobility and velocity, particularly during acceleration, with effects regulated by elastic instability.

Keywords:

Droplet manipulation OpenFOAM Viscoelastic droplets Wettability gradient

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Area of Science:

Fluid dynamics
Rheology
Surface science

Background:

Droplet migration on surfaces is crucial in various applications.
Understanding the influence of fluid properties on droplet behavior is essential.
Wettability gradients significantly impact interfacial phenomena.

Purpose of the Study:

To investigate the viscoelastic effects on droplet migration driven by a wettability gradient.
To quantify the impact of elasticity on droplet mobility and deformation.
To explore the role of the Oldroyd-B model in simulating viscoelastic droplet behavior.

Main Methods:

Numerical simulation using the volume-of-fluid method in OpenFOAM.
Employing the Oldroyd-B model to represent droplet rheological properties.
Systematically varying elasticity parameters and contact angles.

Main Results:

Viscoelastic droplets exhibit higher migration mobility than Newtonian droplets, especially during acceleration.
Droplet displacement and velocity increase with decreasing viscoelasticity parameter.
Velocity enhancement is linked to elastic instability at high Weissenberg numbers.
Droplet velocity shows significant changes between 130° and 60° contact angles.

Conclusions:

Elasticity plays a critical role in enhancing droplet migration on wettability gradients.
The Oldroyd-B model effectively captures viscoelastic effects influencing droplet dynamics.
Wettability gradient and elastic properties are key factors governing droplet behavior.