High-frequency ultrasonic speckle velocimetry in sheared complex fluids

被引:123
作者
Manneville, S [1 ]
Bécu, L [1 ]
Colin, A [1 ]
机构
[1] Ctr Rech Paul Pascal, F-33600 Pessac, France
关键词
D O I
10.1051/epjap:2004165
中图分类号
O59 [应用物理学];
学科分类号
摘要
High-frequency ultrasonic pulses at 36 MHz are used to measure velocity profiles in a complex fluid sheared in the Couette geometry. Our technique is based on time-domain cross-correlation of ultrasonic speckle signals backscattered by the moving medium. Post-processing of acoustic data allows us to record a velocity pro. le in 0.02 - 2 s with a spatial resolution of 40 mum over 1 mm. After a careful calibration using a Newtonian suspension, the technique is applied to a sheared lyotropic lamellar phase seeded with polystyrene spheres of diameter 3 - 10 mum. Time-averaged velocity profiles reveal the existence of inhomogeneous flows, with both wall slip and shear bands, in the vicinity of a shear-induced "layering" transition. Slow transient regimes and/or temporal fluctuations can also be resolved and exhibit complex spatio-temporal flow behaviors with sometimes more than two shear bands.
引用
收藏
页码:361 / 373
页数:13
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