非牛顿流体的非等温搅拌流动

NON - ISOTHERMAL AGITATED FLOW FIELDS OF NON - NEWTONIAN FLUIDS

采用流线迎风Petrov-Galerkin(SUPG)有限元解能量方程与一般Galerkin有限元解动量方程相结合的方法对Carreau流体的非等温搅拌流场进行了数值模拟。并与牛顿流体等温搅拌流动的相应结果作了比较,表明剪切变稀和温度效应对搅拌流动的流型、温度分布产生很大的影响。冷模试验结果应用于热模工况时会产生较大的误差。

In this paper, the streamline upwind Petrov - Galerkin (SUPG) F E M and Galerkin F E M are used to simulate the non - isothermal flow of the Carreau fluid in an agitated vessel induced by scraped -surface blades. The results show a great deviation from the isothermal Newtonian flow, and indicate that the power - law exponent n, temperature coefficient b, dimensionless groups Re, Pe, and Br have a distinct effect on the flow pattern. This work provides an effective numerical method for predicting the velocity profile, temperature, shear rate and shear stress distribution of non - isothermal, non - Newtonian -flow in an agitated vessel.