"fluid bearing" effect of enclosed liquids in grooves on drag reduction in microchannels

Haosheng Chen, Yang Gao, Howard A. Stone, Jiang Li

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


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.

Original languageEnglish (US)
Article number083904
JournalPhysical Review Fluids
Issue number8
StatePublished - Dec 2016

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Modeling and Simulation
  • Fluid Flow and Transfer Processes


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