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Unstable parallel flows triggered by a fast chemical reaction
Teodor Burghelea,Ian Frigaard +1 more
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In this paper, an experimental investigation of an instability triggered by a fast chemical reaction in a low inertia parallel flow in a small channel is presented, where two fluids evenly injected in a straight channel react creating a strongly stratified distribution of viscosity near their interface, which destabilizes the flow.Abstract:
We present an experimental investigation of an instability triggered by a fast chemical reaction in a low inertia parallel flow in a small channel. Two fluids evenly injected in a straight channel react creating a strongly stratified distribution of viscosity near their interface, which destabilizes the flow. Depending on the flow rates and the aspect ratio of the flow channel, several unstable regimes are observed: mixing regime, weakly stratified regime and a stable stratified regime. In channels of 1:1 aspect ratio we find most efficient mixing (and highest flow resistance) at an intermediate pressure drops, as the flow transitions between a fully 3D regime and more stratified regime. For channels of small aspect ratio the non-monotonicity is less evident: higher pressure drops lead to increased mixing.read more
Citations
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Effects of low and high viscous product on Kelvin–Helmholtz instability triggered by A+B→C type reaction
TL;DR: In this article , the dynamics of the Kelvin-Helmholtz (K-H) instability triggered by a non-linear second order A+B→C type reaction is analyzed through direct numerical simulations.
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Reconstruction by fluorescence imaging of the spatio-temporal evolution of the viscosity field in Hele-Shaw flows
TL;DR: In this article, the spatio-temporal evolution of the viscosity field during stable and unstable radial flows of glycerol-water solutions in a horizontal Hele-Shaw cell where a localized temperature gradient is imposed.
Journal ArticleDOI
Unpredictable Dynamics of Polymeric Reacting Flow by Comparison between Pre- and Post-Reaction Fluid Properties: Hydrodynamics Involving Molecular Diagnosis via ATR-FTIR Spectroscopy.
TL;DR: This study demonstrates the existence of a reacting flow in which examination of microscopic molecular structure is required to understand the macroscopic flow dynamics, and elucidated the underlying reaction mechanism, which involves a structural change in the side functional group in polyacrylamide at ultrahigh molecular weights with ultralow concentrations.
Journal ArticleDOI
Fibre-reinforced biocompatible hydrogel to replace single-use plastic tubing in the clinical setting
Jordan MacKenzie,Erika M. J. Siren,Masoud Daneshi,R. Melnick,T. Treskatis,Anthony Wachs,Jayachandran N. Kizhakkedathu,D.M. Martinez +7 more
TL;DR: In this article, a manufacturing process to produce hydrogel tubing for extracorporeal applications was examined and three different 3D-extrusion printers operating with speeds of up to 12 cm/s.
Characterising the non-ideal behaviour of a Carbopol gel flowing in thin conduits
TL;DR: In this article, the authors examined three problems related to the slow flow of viscoplastic fluid in a thin conduit in order to characterise unique effects of its complex rheology.
References
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Journal ArticleDOI
Chaotic Mixer for Microchannels
Abraham D. Stroock,Stephan K. W. Dertinger,Armand Ajdari,Igor Mezic,Howard A. Stone,George M. Whitesides +5 more
TL;DR: This work presents a passive method for mixing streams of steady pressure-driven flows in microchannels at low Reynolds number, and uses bas-relief structures on the floor of the channel that are easily fabricated with commonly used methods of planar lithography.
Journal ArticleDOI
Elastic turbulence in a polymer solution flow
Alex Groisman,Victor Steinberg +1 more
TL;DR: The low Reynolds number or ‘elastic’ turbulence that is observed is accompanied by significant stretching of the polymer molecules, resulting in an increase in the elastic stresses of up to two orders of magnitude.
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Advances in iterative multigrid PIV image processing
TL;DR: An image-processing technique that performs iterative interrogation of particle image velocimetry (PIV) recordings based on cross-correlation enhances the matching performances by means of a relative transformation between the interrogation areas, showing that a remarkable improvement can be obtained in terms of precision and dynamic range.
Journal ArticleDOI
Mud removal and cement placement during primary cementing of an oil well – Laminar non-Newtonian displacements in an eccentric annular Hele-Shaw cell
TL;DR: In this article, a two-dimensional model is derived of the displacement flows that occur during primary cementing of oil and gas wells, where the displacement geometry is a long narrow eccentric annulus, between the casing and the rock formation.
Journal ArticleDOI
Drag force on a sphere in steady motion through a yield- stress fluid
TL;DR: In this article, the authors studied the motion of spheres falling through yield-stress Carbopol gels and measured the velocity of the falling sphere as a function of time and sphere density.
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