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arXiv 0904.0671cond-mat.soft
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剪切增稠悬浮液的动态堵塞点

A dynamic jamming point for shear thickening suspensions

Eric Brown, Heinrich M. Jaeger

摘要:

我们报告的流变测量,以表征两个模型的剪切增稠悬浮液的临界行为:玉米淀粉在水中和玻璃球在油中。粘度曲线的剪切增稠部分的斜率随填充分数的增加而急剧增加,并在临界填充分数φ c处发散。粘度和屈服应力的大小也被发现有标度,发散在φ_c。只要屈服应力小于粘度最大值时的应力,我们就观察到剪切增稠。在该点以上,悬浮液转变为纯剪切稀化。基于这些数据,我们提出了一个动态堵塞相图悬浮液,并表明,剪切增稠的极限情况下对应于堵塞状态。

英文摘要:

We report on rheometry measurements to characterize critical behavior in two model shear thickening suspensions: cornstarch in water and glass spheres in oil. The slope of the shear thickening part of the viscosity curve is found to increase dramatically with packing fraction and diverge at a critical packing fraction phi_c. The magnitude of the viscosity and the yield stress are also found to have scalings that diverge at phi_c. We observe shear thickening as long as the yield stress is less than the stress at the viscosity maximum. Above this point the suspensions transition to purely shear thinning. Based on these data we present a dynamic jamming phase diagram for suspensions and show that a limiting case of shear thickening corresponds to a jammed state.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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