Journal
PHYSICAL REVIEW FLUIDS
Volume 1, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevFluids.1.083904
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Funding
- National Natural Science Foundation of China [51275266, 51322501, 51275036]
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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.
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