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• W1969691808 endingPage "4034" @default.
• W1969691808 startingPage "4028" @default.
• W1969691808 abstract "Flow instabilities are well known to occur in macroscopic flows when elastic fluids flow along curved streamlines. In this work we use flow visualization to study the mechanism underlying a purely elastic flow instability for Poiseuille flow in a micro (μ)channel having a zigzag path (curved streamlines) and quantitatively investigate its implications for fluid mixing (studied by fluorescence microscopy) in the μchannel. We find that the instability enhances mixing over the range of applied flow rates. For Newtonian streams, mixing occurs by molecular diffusion, and, as expected, mixing worsens with increasing flow rate because of decreasing residence time. However, for elastic fluid streams, we find substantial enhancement of mixing at sufficiently high throughputs, which indicates a strategy to counter the loss of diffusive mixing at high throughputs by exciting an elastic flow instability. Flow visualization is done using neutrally buoyant non-Brownian tracer particles added to the elastic fluids and also to the Newtonian fluids. In the Newtonian fluids, the tracer particles follow the streamlines. In the elastic fluids, the particles are radially displaced while flowing around bends in the zigzag μchannel, revealing the presence of secondary flow. This radial secondary flow, which promotes mixing between adjacent fluid streams, motivates us to draw an analogy between the instability observed here for the elastic fluids in the μchannel and the elastic instability that occurs in systems with curved streamlines, e.g., in the viscoelastic (non-inertial) Taylor–Couette, Dean, and Taylor–Dean instabilities." @default.
• W1969691808 created "2016-06-24" @default.
• W1969691808 creator A5016556108 @default.
• W1969691808 creator A5027494956 @default.
• W1969691808 creator A5068286254 @default.
• W1969691808 date "2004-11-01" @default.
• W1969691808 modified "2023-10-17" @default.
• W1969691808 title "Elastic flow instability, curved streamlines, and mixing in microfluidic flows" @default.
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• W1969691808 doi "https://doi.org/10.1063/1.1792011" @default.
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