STEADY AND TRANSIENT RESPONSES OF ELECTRORHEOLOGICAL SUSPENSION PASSING THROUGH A RECTANGULAR CHANNEL
STEADY AND TRANSIENT RESPONSES OF ELECTRORHEOLOGICAL SUSPENSION PASSING THROUGH A RECTANGULAR CHANNEL
复制标题
电流流悬浮液通过矩形通道的稳态和瞬态响应
DOI：
10.1142/s0217979296001409
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发表时间：
1996
影响因子：
1.7
通讯作者：
Y. Asako
中科院分区：
文献类型：
--
作者：
M. Nakano;Ryuji Aizawa;Y. Asako
通过确保通道内的压降（其中流体建立了泊肃叶流动几何形状），研究了含有磺化聚合物颗粒的电流变流体流过两个固定平行电极之间的矩形通道时电流变效应的稳态和瞬态响应。阐明了施加电场的类型和强度以及平均流速对稳态响应的影响，并与使用旋转流变仪的 Couette 流动几何形状进行比较，以研究 ER 效应对流动几何形状的依赖性。随着平均流速的增加，屈服应力在直流电压下呈指数下降，而在交流电压下，屈服应力逐渐增加并达到峰值，然后下降。相比之下，旋转流变仪测得的屈服应力在低剪切速率下突然下降，并达到几乎恒定的水平。也就是说，测量的屈服应力取决于流动几何形状和施加电场的类型。测得的对阶跃输入电压的压力响应可以通过一阶响应来近似，并且ER效应的上升时间常数取决于ER流体的成分，范围从5到40毫秒。
The steady and transient responses of ER effect of ER fluids containing sulfonated polymer particles, passing through a rectangular channel between two fixed parallel electrodes, were investigated by ensuring pressure drops across the channel in which the flow established a Poiseuille flow geometry. Effects of the types and the strength of applied electric field and the mean flow velocity on the steady response were clarified, and compared with those in a Couette flow geometry using a rotary rheometer in order to investigate the dependence of ER effects on the flow geometry. As the mean flow velocity increased, the yield stress decreased exponentially under DC voltage, while, in the case of AC voltage, gradually increased and reached a peak level and decreased thereafter. Contrastively, the yield stress measured by the rotary rheometer decreased suddenly at low shear rate, and reached almost constant level. That is, the measured yield stress depends on the flow geometry and the type of applied electric field. The measured pressure response to a step input voltage can be approximated by a first order response, and the rising time constant of ER effect depend on the compositions of ER fluids and range from 5 to 40 msec.