一种用于复杂流体中局部法向应力测量的新型压力传感器阵列
A new pressure sensor array for local normal stress measurement in complex fluids
AI总结：
本文提出一种置于扭转流变仪底板的5×5压电电容式聚合物泡沫压力传感器阵列，可局部映射复杂流体法向应力，并在聚合物溶液、负应力检测和玉米淀粉剪切增稠悬浮液中验证其高精度与表征能力。
摘要：
本文介绍了一种安装在标准扭转流变仪底板上的新型压力传感器阵列。它由一种独特的压电电容性聚合物泡沫制成，包含25个电容式压力传感器（每个表面积为4.5×4.5 mm²），共同构成5×5规则阵列。该传感器阵列用于获得复杂流体中法向应力的局部映射，从而显著扩展了流变仪的能力。我们通过三个示例对此进行了演示。首先，在聚合物溶液中重建压力分布，从而能够同时测量第一和第二法向应力差N₁和N₂，精度为2 Pa。在第二部分，我们表明负法向应力也可以被检测到。最后，我们关注在剪切增稠的玉米淀粉颗粒悬浮液中同时在空间和时间上扩展的法向应力波动。我们证明存在一种非常规则旋转的独特局部非均质性。除了低成本和高通用性之外，这些传感器还在此展示了其精细表征粘性测量流动中法向应力的潜力。
英文摘要：
A new pressure sensor array, positioned on the bottom plate of a standard torsional rheometer is presented. It is built from a unique piezo-capacitive polymeric foam, and consists of twenty-five capacitive pressure sensors (of surface 4.5$\times$4.5 mm$^2$ each) built together in a 5$\times$5 regular array. The sensor array is used to obtain a local mapping of the normal stresses in complex fluids, which dramatically extends the capability of the rheometer. We demonstrate this with three examples. First, the pressure profile is reconstructed in a polymer solution, which enable the simultaneous measurement of the first and the second normal stress differences $N_1$ and $N_2$, with a precision of 2 Pa. In a second part, we show that negative normal stresses can also be detected. Finally, we focus on the normal stress fluctuations that extend both spatially and temporally ina shear-thickening suspension of cornstarch particles. We evidence the presence of local a unique heterogeneity rotating very regularly. In addition to their low-cost and high versatility, the sensors show here their potential to finely characterize the normal stresses in viscosimetric flows.
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