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Title: Inertio-elastic mixing in a straight microchannel with side wells

Mixing remains a challenging task in microfluidic channels because of their inherently small length scale. In this work, we propose an efficient microfluidic mixer based on the chaotic vortex dynamics of a viscoelastic flow in a straight channel with side wells. When the inertia and elasticity of a dilute polymer solution are balanced (i.e., the Reynolds number Re and Weissenberg number Wi are both on the order of 10{sup 1}), chaotic vortices appear in the side wells (inertio-elastic flow instability), enhancing the mixing of adjacent fluid streams. However, there is no chaotic vortex motion in Newtonian flows for any flow rate. Efficient mixing by such an inertio-elastic instability is found to be relevant for a wide range of Re values.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [1] ;  [4]
  1. Department of Energy Systems Research, Ajou University, Suwon 443-749 (Korea, Republic of)
  2. Tissue Engineering and Microfluidics Laboratory, The Australian Institute for Bioengineering and Nanotechnology, University of Queensland, St Lucia, 4072 QLD (Australia)
  3. (Australia)
  4. (Korea, Republic of)
Publication Date:
OSTI Identifier:
22489268
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 1; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; CHAOS THEORY; ELASTICITY; FLOW RATE; INSTABILITY; LENGTH; MATHEMATICAL SOLUTIONS; MIXING; MOMENT OF INERTIA; POLYMERS; REYNOLDS NUMBER