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      Heat and mass transfer over slippery, superhydrophobic surfaces

      1 , 1
      Physics of Fluids
      AIP Publishing

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          Flow boundary conditions from nano- to micro-scales

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            Microfluidics: The No-Slip Boundary Condition

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              Control of slippage with tunable bubble mattresses.

              Tailoring the hydrodynamic boundary condition is essential for both applied and fundamental aspects of drag reduction. Hydrodynamic friction on superhydrophobic substrates providing gas-liquid interfaces can potentially be optimized by controlling the interface geometry. Therefore, establishing stable and optimal interfaces is crucial but rather challenging. Here we present unique superhydrophobic microfluidic devices that allow the presence of stable and controllable microbubbles at the boundary of microchannels. We experimentally and numerically examine the effect of microbubble geometry on the slippage at high resolution. The effective slip length is obtained for a wide range of protrusion angles, θ, of the microbubbles into the flow, using a microparticle image velocimetry technique. Our numerical results reveal a maximum effective slip length, corresponding to a 23% drag reduction at an optimal θ ≈ 10°. In agreement with the simulation results, our measurements correspond to up to 21% drag reduction when θ is in the range of -2° to 12°. The experimental and numerical results reveal a decrease in slip length with increasing protrusion angles when >/~ 10°. Such microfluidic devices with tunable slippage are essential for the amplified interfacial transport of fluids and particles.
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                Author and article information

                Journal
                Physics of Fluids
                Physics of Fluids
                AIP Publishing
                1070-6631
                1089-7666
                April 2016
                April 2016
                : 28
                : 4
                : 042002
                Affiliations
                [1 ]Soft matter, Fluidics and Interfaces, Faculty of Science and Technology, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
                Article
                10.1063/1.4945656
                4fbf44fa-5650-4b70-8168-640e1078057d
                © 2016

                http://creativecommons.org/licenses/by/4.0/

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