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“Fluid bearing” effect of enclosed liquids in grooves on drag reduction in microchannels

Author(s): Chen, Haosheng; Gao, Yang; Stone, Howard A; Li, Jiang

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Abstract: We report details of the fluid motion formed within and above grooves when a laminar continuous phase fluid flows over a second immiscible fluid enclosed in a grooved microchannel. Vortical structures within the transverse grooves were caused by a slip velocity at the fluid-fluid interface and act as “fluid bearings” on the boundary to lubricate the flow of the continuous phase. We investigated the drag reduction in the laminar flow in the microchannel by measuring slip at the boundaries and calculating an effective slip length, taking into account the influence of the effect of the viscosity ratio of the two fluids on the effective slip length. The “fluid bearing” effect can be used to transport high viscosity fluids using low viscosity fluids trapped in cavities to reduce drag.
Publication Date: 2016
Citation: Chen, Haosheng, Yang Gao, Howard A. Stone, and Jiang Li. "“Fluid bearing” effect of enclosed liquids in grooves on drag reduction in microchannels." Physical Review Fluids 1, no. 8 (2016): pp. 083904. doi:10.1103/PhysRevFluids.1.083904
DOI: 10.1103/PhysRevFluids.1.083904
EISSN: 2469-990X
Pages: 083904
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review Fluids
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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