平板Couette流场中聚合物流变性质及分子构象的数值模拟

通过耦合Brown构形场的有限体积法,对基于FENE(Finite Extension Non-linear Elastic)殊一簧链分子模型的平板Couette流动进行了模拟.不但得到了流动过程中的速度、应力等宏观信息,还得到了分子链的位形、分子链的取向角以及拉伸量等微观信息.另外,还研究了弹簧的最大拉伸长度b和we...

Rheological Properties and Molecular Configuration of Polymer Solution in Planar Couette Flow

Brownian configuration field coupled with finite volume method was used to capture the most important features of dynamics of dilute polymer solution.The efficiency of numerical schemes was evaluated by performing FENE bead-spring chain models in transient planar Couette flow.The velocity and stress also the orientation and stretch of polymer molecule were captured.Additionally,the influences of the dimensionless finite extensibility parameter of spring b and Weissenberg number We on rheological properties and molecular configuration of dilute polymer solution were analyzed.The results of simulation show that the increment of b and We makes the first normal stress difference and the polymer molecular extension increase,but the orientation angle of polymer molecule decrease.However,considering the shear stress,the influence of b and We are opposite.Namely,the shear stress increases with increasing b,while the shear stress decreases with increasing We.