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 interface geometry. Therefore, establishing stable optimal crucial but rather challenging. Here we present unique microfluidic devices that allow presence controllable microbubbles at microchannels. We experimentally numerically examine effect...

In this study, we investigated inelastic non-Newtonian fluid flow over heterogeneously slippery surfaces. First, simulated the of aqueous xanthan gum solutions a bubble mattress, which is superhydrophobic surface consisting transversely positioned no-slip walls and no-shear gas bubbles. The results reveal that for shear-thinning fluids wall slip can be increased significantly, provided system operated in regime. For 0.2 wt% solution with power-law index n=0.4, numerical indicate enhanced 3.2...

This study reports a novel approach for separation of charged species using anion‐exchange hydrogel (AEH) and cation‐exchange (CEH) in microfluidic device. The capillary line pinning technique, which is applied this study, enables situ fabrication alternating AEH CEH that are placed confined compartments. Adjacent enriched depleted streams obtained continuous flow when potential difference over the stack. desalination performance microchip demonstrated at different salt concentrations (0.01...

In this study we investigate numerically how a partially slippery bubble mattress can be employed to enhance momentum and mass transport. The mattress, which is superhydrophobic surface, consists of an array gas bubbles with no-slip walls in between. We consider pressure-driven laminar flow over the solute being supplied from bubbles. results show that, because effective wall slip, transport enhanced significantly respect fully saturated wall. enhancement depends on interface geometry i.e....

Abstract Graetz and Nusselt studied heat transfer between a developed laminar fluid flow tube at constant wall temperature. Here, we extend the Graetz–Nusselt problem to dense flows with partial slip. Its limits correspond classical problems for no-slip no-shear flow. The amount of is expressed by local number $\mathit{Nu}_{x}$ , which defined as ratio convective conductive radial transfer. In thermally developing regime, scales position $\tilde{x}=x/L$ $\mathit{Gz}$ i.e....

A bumpy bubble mattress maximizes fluid flow over it. team of theorists explain this phenomenon by looking at the viscous dissipation distribution. For an increasing protrusion angle, decreases near corners, while it increases in bulk. These two antagonistic effects lead to optimum angle.

The Villermaux–Dushman method, one of the most extensively used test reaction systems for micromixing characterization, has been widely criticized years due to uncertainties regarding incomplete dissociation sulfuric acid and proposed kinetic study by Guichardon et al. In this work, a renewed kinetics iodide–iodate is presented, using perchloric avoid issues concerning dissociation. experimental results are in good agreement with fifth-order rate law reaction. coefficient strongly depends on...

The classical Graetz-Nusselt problem is extended to describe heat and mass transfer over heterogeneously slippery, superhydrophobic surfaces. cylindrical wall consists of segments with a constant temperature/concentration areas that are insulating/impermeable. Only in the case transport do locations hydrodynamic slip exchange coincide. This makes advection near exchanging larger than regions. Also direction radial fluid flow reversed for transport, which has an influence on location where...

The Villermaux-Dushman method, one of the most extensively used test reaction systems for micromixing characterization, has been widely criticized years due to uncertainties regarding incomplete dissociation sulfuric acid and proposed kinetic study by Guichardon et al. In this work, a renewed kinetics iodide-iodate is presented, using perchloric avoid issues concerning dissociation. experimental results are in good agreement with fifth order rate law reaction. coefficient strongly depends on...

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The Villermaux-Dushman method, one of the most extensively used test reaction systems for micromixing characterization, has been widely criticized years due to uncertainties regarding incomplete dissociation sulfuric acid and proposed kinetic study by Guichardon et al. In this work, a renewed kinetics iodide-iodate is presented, using perchloric avoid issues concerning dissociation. experimental results are in good agreement with fifth order rate law reaction. coefficient strongly depends on...

The Villermaux-Dushman method, one of the most extensively used test reaction systems for micromixing characterization, has been widely criticized years due to uncertainties regarding incomplete dissociation sulfuric acid and proposed kinetic study by Guichardon et al. In this work, a renewed kinetics iodide-iodate is presented, using perchloric avoid issues concerning dissociation. experimental results are in good agreement with fifth order rate law reaction. coefficient strongly depends on...