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Article
Elastic secondary flows in sharp 90 degree micro-bends: a comparison of PEO and DNA solutions
Journal of Rheology
  • Shelly Gulati, University of California, Berkeley
  • C. S. Dutcher, University of California, Berkeley
  • Dorian Liepmann, University of California, Berkeley
  • Susan J. Muller, University of California, Berkeley
Document Type
Article
DOI
10.1122/1.3308643
Publication Date
3-1-2010
Abstract
The growth or absence of elastic secondary flows is documented for flows of dilute and semi-dilute polymer solutions in sharp 90° micro-bends in channels of rectangular cross-section; secondary flows are not present for Newtonian flows under similar conditions. Flow visualization shows that a vortex is present in the inner, upstream corner of the bend and grows with increasing Reynolds (Re) and Weissenberg (Wi) numbers for flows of shear-thinning, semi-dilute polymeric solutions containing λ-DNAλ-DNA (9.9×10−7−2, 0.42−4−33.5×10−4−3, 1.8−4−23.3×10−4−2, 1.1
Citation Information
Shelly Gulati, C. S. Dutcher, Dorian Liepmann and Susan J. Muller. "Elastic secondary flows in sharp 90 degree micro-bends: a comparison of PEO and DNA solutions" Journal of Rheology Vol. 54 Iss. 2 (2010) p. 375 - 392 ISSN: 0148-6055
Available at: http://works.bepress.com/shelly-gulati/52/