A Method of Modeling Dynamic Viscosity Based on Viscous Dissipation

Abstract

Based on dissipation mechanism of shearing power,a new method of modeling dynamic viscosity of polymer melts in vibrating shear flows was proposed in this paper.And theoretical models were formulated.Using the method,the dynamic viscosity of Maxwell fluid in simple vibrating shear flow was found uniform with results using a traditional method.The result uniformity showed validity of the method.And the prediction ability of the method was discussed for vibrating shear flows superposed on steady flow.A deficiency of the model for the superposed flows was found and the causes were analyzed.Finally,Rheological experiments were carried out.The experimental investigation showed a good agreement with the theoretical prediction in a bound of small amplitude.