title: Direct visualization of shear waves in viscoelastic fluid using microspheres.
abstract: Wormlike micellar fluids, being viscoelastic, support shear waves. Shear waves in 500 mM CTAB-NaSal micellar fluid were visualized by seeding the fluid with 212-250 μm diameter polyethylene microspheres. This method was compared to visualization through birefringence induced by shear stress in the fluid. Measured shear wave speeds were 733 and 722 mm/s, respectively, for each technique. Particle displacement was a sinusoidal function of time and displacement amplitude decreased quadratically with distance from the source. This supports the possibility of using particle amplitude measurements as a measure of attenuation even at low fluid concentration where birefringence visualization techniques fail.
authors.affiliation: Department of Physics and Astronomy, University of Mississippi, University, Mississippi 38677, USA cpembert@olemiss.edu, cmtierne@go.olemiss.edu, sdayavan@go.olemiss.edu, jgladden@olemiss.edu.
authors.forename: C
authors.initials: C
authors.lastname: Labuda
authors.affiliation: Department of Physics and Astronomy, University of Mississippi, University, Mississippi 38677, USA cpembert@olemiss.edu, cmtierne@go.olemiss.edu, sdayavan@go.olemiss.edu, jgladden@olemiss.edu.
authors.forename: C M
authors.initials: CM
authors.lastname: Tierney
authors.affiliation: Department of Physics and Astronomy, University of Mississippi, University, Mississippi 38677, USA cpembert@olemiss.edu, cmtierne@go.olemiss.edu, sdayavan@go.olemiss.edu, jgladden@olemiss.edu.
authors.forename: E G Sunethra K
authors.initials: EG
authors.lastname: Dayavansha
authors.affiliation: Department of Physics and Astronomy, University of Mississippi, University, Mississippi 38677, USA cpembert@olemiss.edu, cmtierne@go.olemiss.edu, sdayavan@go.olemiss.edu, jgladden@olemiss.edu.
authors.forename: J R
authors.initials: JR
authors.lastname: Gladden