Thermal and spectral behavior of ultrasonically generated shear waves in a viscoelastic micellar fluid | Zendy

E. G. Sunethra K. Dayavansha | Zendy; Cecille Labuda | Zendy; Joel Mobley | Zendy

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Thermal and spectral behavior of ultrasonically generated shear waves in a viscoelastic micellar fluid

Author(s) -

E. G. Sunethra K. Dayavansha,

Cecille Labuda,

Joel Mobley

Publication year - 2017

Publication title -

proceedings of meetings on acoustics

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.15

H-Index - 16

ISSN - 1939-800X

DOI - 10.1121/2.0000732

Subject(s) - materials science , viscoelasticity , shear waves , shear (geology) , shear modulus , rheology , optics , composite material , physics

Wormlike micellar (WM) fluids, which flow when subjected to long term stresses, are mechanically viscoelastic over shorter durations. These fluids are birefringent under shear, allowing the study of shear wave propagation using both optical and acoustic modalities. In this work, the temperature and frequency dependent behavior of ultrasonically generated shear waves in a WM fluid is studied. A fluid consisting of hexadecyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSAL) combined in a 5:3 ratio is used in a 200 mM concentration. A high intensity focused ultrasound (HIFU) beam generates radiation pressure in the fluid and can induce shear waves of sufficient amplitude to be visualized optically when the beam is modulated. By pulsing the HIFU beam, a train of shear waves are generated which propagate laterally from the focal region. The temperature and frequency dependent behavior of the HIFU generated shear waves are correlated with the rheological and microstructural properties of the fluid. ...

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