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Fabrication, Operation and Flow Visualization in Surface-acoustic-wave-driven Acoustic-counterflow Microfluidics

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Gas-liquid two-phase flow patterns in rectangular polymeric microchannels: effect of surface wetting properties.

D Huh¹, C-H Kuo, J B Grotberg

¹Department of Biomedical Engineering, University of Michigan, 2200 Bonisteel Blvd, Ann Arbor, MI 48109-2099, USA.

New Journal of Physics

|February 4, 2010

Summary

Surface wettability significantly impacts gas-liquid two-phase flow regimes in polymeric microchannels. Hydrophobic surfaces exhibit more flow patterns than hydrophilic ones, affecting fluid distribution.

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Area of Science:

Fluid dynamics
Microfluidics
Materials science

Background:

Understanding gas-liquid two-phase flow is crucial for microfluidic applications.
Polymeric microchannels offer tunable surface properties.
Surface wettability influences multiphase flow behavior.

Purpose of the Study:

To map and characterize gas-liquid two-phase flow regimes in polymeric microchannels.
To investigate the effect of surface wettability on flow patterns.
To compare flow regimes in hydrophobic and hydrophilic microchannels.

Main Methods:

Utilized video and confocal microscopy for flow visualization.
Employed parallel injection of air and water into a Y-shaped junction.
Fabricated microchannels from poly(dimethylsiloxane) (PDMS) with varying surface properties.

Main Results:

Observed seven distinct flow regimes in hydrophobic microchannels.
Identified only two flow patterns in hydrophilic microchannels.
Demonstrated a profound influence of surface wettability on spatial distribution of air and water.

Conclusions:

Surface wettability is a critical factor controlling gas-liquid flow regimes in microchannels.
Hydrophobic surfaces promote a wider variety of flow patterns compared to hydrophilic surfaces.
The findings have implications for designing and optimizing microfluidic devices.