Volume 38, Number 5, May II 1997
|Page(s)||389 - 394|
|Section||Cross-disciplinary physics and related areas of science and technology|
|Published online||01 September 2002|
Inhomogeneous structure formation and shear-thickening in worm-like micellar solutions
Department of Chemical Engineering, University of California,
Santa Barbara, CA 93106, USA
2 Department of Mechanical Engineering, University of California, Santa Barbara, CA 93106, USA
3 Department of Materials, University of California - Santa Barbara, CA 93106, USA
Accepted: 1 April 1997
The time evolution of flow-induced structures in low-concentration worm-like micellar solutions is studied using direct visualization and rheological methods. The visualization measurements show growth of a new viscous shear-induced phase (SIP) starting on the inner wall of a Couette shear cell at a time t1 after the commencement of shear flow. The SIP continues to grow across the shear cell until it fills the entire gap at a time t2. Rheological measurements show that the time t1 corresponds to the induction time for the increase in stress and that t2 corresponds to the plateau time for the saturation of stress. These measurements provide convincing evidence that the increase of stress with time results from the inhomogeneous growth of a new shear-induced phase in the flow cell. The growth of the new phase across the cell is approximately linear in time.
PACS: 83.50.By – Transient deformation and flow; time-dependent properties: start-up, stress relaxation, creep, recovery, etc / 83.50.Qm – Thixotropy; thickening flows
© EDP Sciences, 1997
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