The Role of Contact Line (Pinning) Forces on Bubble Blockage in Microchannels

Journal of Fluids Engineering
Mahshid Mohammadi, Kendra V Sharp

Abstract

This paper highlights the influence of contact line (pinning) forces on the mobility of dry bubbles in microchannels. Bubbles moving at velocities less than the dewetting velocity of liquid on the surface are essentially dry, meaning that there is no thin liquid film around the bubbles. For these "dry" bubbles, contact line forces and a possible capillary pressure gradient induced by pinning act on the bubbles and resist motion. Without sufficient driving force (e.g., external pressure), a dry bubble is brought to stagnation. For the first time, a bipartite theoretical model that estimates the required pressure difference across the length of stagnant bubbles with concave and convex back interfaces to overcome the contact line forces and stimulate motion is proposed. To validate our theory, the pressure required to move a single dry bubble in square microchannels exhibiting contact angle hysteresis has been measured. The working fluid was deionized water. The experiments have been conducted on coated glass channels with different surface hydrophilicities that resulted in concave and convex back interfaces for the bubbles. The experimental results were in agreement with the model's predictions for square channels. The prediction...Continue Reading

References

Feb 11, 1991·Physical Review Letters·C RedonF Rondelez
Nov 18, 2005·Journal of Colloid and Interface Science·Ho-Young KimByung Ha Kang
Dec 5, 2006·Journal of Colloid and Interface Science·Hansang ChoTae Song Kim
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Citations

May 16, 2015·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Matthew CoblynGoran Jovanovic
Dec 17, 2016·Analytical Chemistry·Matthew K GelberRohit Bhargava
Feb 6, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Cong ChaoXianfeng Fan
Jun 6, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Hana Tarábková, Pavel Janda
Dec 8, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Cong ChaoXianfeng Fan

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