Electrorheological Fluids in Squeeze under AC and DC Excitation
Electrorheological Fluids in Squeeze under AC and DC Excitation
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交流和直流激励下挤压的电流变流体
DOI：
10.1142/s0217979299001892
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发表时间：
1999
影响因子：
1.7
通讯作者：
R. Stanway
中科院分区：
文献类型：
--
作者：
J. Sproston;A. K. E. Wahed;R. Stanway
本文对一种电流变流体在振荡挤压流动中的性能进行了实验研究，并将结果与准稳态理论模型预测的结果进行了比较。在准稳态理论模型中，假定流体的流变行为遵循双粘性剪切应力/剪切速率特征。流体被夹在两个平行的平面电极之间，上面的电极是静止的，下面的电极与它的平面垂直振荡。特别令人感兴趣的是，通过流体传递的力随振荡频率和振幅以及施加的交流和直流电压水平的变化而发生的时间变化。在交流情况下，传递力的大小不仅是施加电压的函数，而且是输入波形形状和电激励频率的函数。在所有情况下，这些力都比在相应的直流情况下所见的力小。
This paper is concerned with an experimental investigation of the performance of an ER fluid in oscillatory squeeze-flow and a comparison of the results with those predicted by a quasi-steady theoretical model in which the rheological behaviour of the fluid is assumed to follow a bi-viscous shears stress/shear rate characteristic. The fluid is sandwiched between two parallel plane electrodes, the upper one stationary and the lower one oscillating normal to its plane. Of particular interest is the temporal variation in the force transmitted through the fluid in response to changes in the oscillation frequency and amplitude and the level of applied AC and DC voltages. The magnitude of the transmitted forces in the AC case is seen to be not only a function of the applied voltage but also of the shape of the input waveform and the electrical excitation frequency. In all cases these forces are found to be smaller than those seen in the corresponding DC case.