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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/48638
Measurement of a Structured Backflow in an Open Small Channel Induced by Surface-Tension Gradients
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We present experiments in which the laterally confined flow of a surfactant film driven by controlled surface tension gradients causes the subtended liquid layer to self-organize into an inner upstream microduct surrounded by the downstream flow. The anomalous interfacial flow profiles and the concomitant backflow are a result of the feedback between two-dimensional and three-dimensional microfluidics realized during flow in open microchannels. Bulk and surface particle image velocimetry data combined with an interfacial hydrodynamics model explain the dependence of the observed phenomena on channel geometry.
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PULIDO COMPANYS, Alba, et al. Measurement of a Structured Backflow in an Open Small Channel Induced by Surface-Tension Gradients. Physical Review Letters. 2013. Vol. 110, num. 214506-1-214506-5. ISSN 0031-9007. [consulted: 12 of August of 2026]. Available at: https://hdl.handle.net/2445/48638