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

http://ir.library.oregonstate.edu/concern/articles/js956h70k

This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by The American Society of Mechanical Engineers (ASME) and can be found at:  http://fluidsengineering.asmedigitalcollection.asme.org/journal.aspx

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  • 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 predictions of the concave and convex back models were within 19% and 27% of the experimental measurements, respectively.
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  • Mohammadi, M., & Sharp, K. V. (2015). The Role of Contact Line (Pinning) Forces on Bubble Blockage in Microchannels. Journal of Fluids Engineering – Transactions of the ASME, 137(3), 031208. doi:10.1115/1.4029033.
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  • description.provenance : Approved for entry into archive by Deanne Bruner(deanne.bruner@oregonstate.edu) on 2015-10-14T18:27:00Z (GMT) No. of bitstreams: 1 MohammadiMahshidMechanicalIndustrialManufacturingEngineeringRoleContactLine(Pinning)Forces.pdf: 879070 bytes, checksum: 360fefd1c4f16ef437c501d5627ac27e (MD5)
  • description.provenance : Made available in DSpace on 2015-10-14T18:27:00Z (GMT). No. of bitstreams: 1 MohammadiMahshidMechanicalIndustrialManufacturingEngineeringRoleContactLine(Pinning)Forces.pdf: 879070 bytes, checksum: 360fefd1c4f16ef437c501d5627ac27e (MD5) Previous issue date: 2015-03-01
  • description.provenance : Submitted by Deanne Bruner (deanne.bruner@oregonstate.edu) on 2015-10-14T18:26:08Z No. of bitstreams: 1 MohammadiMahshidMechanicalIndustrialManufacturingEngineeringRoleContactLine(Pinning)Forces.pdf: 879070 bytes, checksum: 360fefd1c4f16ef437c501d5627ac27e (MD5)

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