弹性-触变性流体的定态剪切粘度与瞬态应力响应

用四种不同级数的动力学方程以表示分散物系内结构单元的聚集与解聚速率,并导出相应的定态和瞬态结构参数式。设弹性模量 G 与结构参数的关系具有与粘度函数相同的形式,求解 Maxwell 方程获得瞬态应力响应。 两种乳浊液的实验证明本文提出的流变模型可以表征弹性-触变性流体的流变性。用n=m=2 的模型可对这些乳浊液作出最佳模拟。

STEADY-SHEAR VISCOSITY AND TRANSIENT STRESS RESPONSE FOR ELASTO-THIXOTROPIC FLUIDS

A phenomenological mode! for dispersed systems which exhibit complex theological behaviour such as shear and time-dependent viscosity, yield stress, and elastici'y is proposed. The model extends the Quemeda model to describe the viscosity function with a structural parameter A which varies according t'o different kinetic orders of particle aggregation and segregation. The transient stress response is obtained by solving on instantaneous Maxwell model with an assumed shear modulus function G of the same form as the viscosity function 7). Accuracy of theproposed model is verified experimentally with the results obtained for 2 oil (creosote)/water emulsions. The model that gives the best fit of experimental data appears to be the one with kinetic orders n=m=2.