Effects of electric fields on the rheology of non-aqueous concentrated suspensions
Effects of electric fields on the rheology of non-aqueous concentrated suspensions
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DOI：
10.1039/f19898502785
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
L. Marshall;C. Zukoski;J. W. Goodwin
中科院分区：
文献类型：
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作者：
L. Marshall;C. Zukoski;J. W. Goodwin
氯化烃中水合聚（甲基丙烯酸酯）颗粒的电流变响应已被表征为场强、剪切速率、体积分数和温度的函数。在低剪切速率下，带电悬浮液的粘度比未带电悬浮液的粘度增加了三个数量级，但在高剪切速率下降低至未带电悬浮液的值。通过考虑作用在颗粒上的基本力来分析观察到的响应，结果发现，在给定的体积分数下，相对粘度对剪切速率、场强和温度的所有依赖性都可以分解为梅森数 [ηc/2Iμ0Iμc(βE)2] 的单个函数。根据宾汉塑性本构方程对结果进行了进一步分析，该方程自然产生了临界梅森数，表征了悬架结构从极化到流体动力控制的转变。
The electrorheological response of hydrated poly(methacrylate) particles in a chlorinated hydrocarbon has been characterized as a function of field strength, shear rate, volume fraction and temperature. Viscosities of electrified suspensions are increased up to three orders of magnitude over the unelectrified suspension at low shear rates but decrease to the value of the unelectrified suspension at high shear rates. The observed response has been analysed by considering the fundamental forces acting on the particles and it is found that, at a given volume fraction, all of the dependencies of relative viscosity on shear rate, field strength and temperature can be collapsed into a single function of the Mason number [ηc/2Iµ0Iµc(βE)2]. The results have been further analysed in terms of a Bingham Plastic constitutive equation from which a critical Mason number naturally arises characterizing the transition from polarization to hydrodynamic control of suspension structure.