High-frequency ultrasonic imaging : A spatio-temporal approach of rheology
High-frequency ultrasonic imaging : A spatio-temporal approach of rheology
复制标题
高频超声成像：流变学的时空方法
DOI：
10.1016/j.colsurfa.2005.06.003
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发表时间：
2005
期刊：
影响因子：
--
通讯作者：
A. Colin
中科院分区：
文献类型：
--
作者：
S. Manneville;L. Bécu;Pauline Grondin;A. Colin
我们描述了如何使用高频超声波来测量和跟踪复杂流体中的速度分布，这些流体在库埃特几何结构中剪切，间隙为0.5-1 mm。该技术提供了40 μm的空间分辨率，通常每秒可以记录速度剖面。这种超声波测速仪与标准流变仪相耦合。由此产生的“超声波流变仪”在各种复杂的流体上进行了测试，这些流体表现出不均匀的速度分布和剪切诱导转变附近的时间波动：层状相、三嵌段共聚物、浓乳液和有机凝胶。
We describe how high-frequency ultrasound can be used to measure and follow velocity profiles in complex fluids sheared in the Couette geometry with a 0.5–1 mm gap. The technique provides a spatial resolution of 40 μ m and velocity profiles can be recorded every second typically. Such ultrasonic velocimetry is coupled to a standard rheometer. The resulting “ultrasonic rheo-velocimeter” is tested on various complex fluids that display both inhomogeneous velocity profiles and temporal fluctuations close to a shear-induced transition: a lamellar phase, a triblock copolymer, a concentrated emulsion, and an organogel.