Extensional flows of polymer solutions in microfluidic converging/diverging geometries

被引：23
|
作者：
McKinley, Gareth H.
Rodd, Lucy E.
Oliverira, Monica S. N.
Cooper-White, Justin
机构：
[1] MIT, Dept Mech Engn, Hatsopoulos Microfluids Lab, Cambridge, MA 02139 USA
[2] Univ Melbourne, Dept Chem & Biomol Engn, Melbourne, Vic 3010, Australia
[3] Univ Queensland, Div Chem Engn, Brisbane, Qld 4072, Australia
来源：
JOURNAL OF CENTRAL SOUTH UNIVERSITY OF TECHNOLOGY | 2007年 / 14卷 / Suppl 1期
基金：
澳大利亚研究理事会; 美国国家科学基金会;
关键词：
extensional theology; microfluidic; extra pressure drop; PEO; Couette correction;
D O I：
10.1007/s11771-007-0202-1
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The effects of fluid elasticity in the flow of non-Newtonian fluids in microfluidic converging/diverging geometries are investigated. We investigate the structure and dynamics of inertio-elastic flow instabilities and elastic corner vortices which develop upstream of the contraction plane, and explore their dependence on the relative magnitudes of inertia and elastic stress generated by the high deformation rates in the contraction geometry. The results show that the shape, size and evolution of these flow structures varies with the elasticity number, which is independent of the flow kinematics and is only dependent on fluid properties (viscosity, density and polymer relaxation time) and the characteristic size of the channel.
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页码：6 / 9
页数：4
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