Department
Bioengineering
Document Type
Article
Publication Title
Physical review. E, Statistical, nonlinear, and soft matter physics
ISSN
1550-2376
Volume
78
Issue
3
DOI
10.1103/PhysRevE.78.036314.
First Page
1
Last Page
5
Publication Date
Fall 1-1-2008
Abstract
Secondary flows that are absent in Newtonian flows are found for semidilute λ-DNA solutions in abrupt planar 90° microbends at modest levels of elasticity. Flow visualization and microparticle image velocimetry experiments show that a vortex, which is present in the inner, upstream corner of the bend, grows with increasing Reynolds and Weissenberg number (9.9 × 10 −7 < Re < 3.1 × 10 −2, 0.41 < Wi < 126).The vortex growth is quantified as a function of elasticity; at high elasticity, the vortex occupies a significant fraction of the upstream channel and distorts the primary flow. The presence of elastic vortices, in which molecules can become trapped for long times, has implications for the design of microdevices for the processing of biological macromolecules.
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Gulati, S.,
Liepmann, D.,
&
Muller, S.
(2008).
Elastic secondary flows of semidilute DNA solutions in abrupt 90° microbends.
Physical review. E, Statistical, nonlinear, and soft matter physics, 78(3), 1–5.
DOI: 10.1103/PhysRevE.78.036314.
https://scholarlycommons.pacific.edu/soecs-facarticles/151
