关键词: 传热, 能量守恒, 数值计算方法, 塑料熔体流动, 有限差分法

Abstract: The numerical simulation can help understanding the melt flow and heat transfer history while plastic processing process in the screw groove, and improve plasticizing performance and the product quality. According to the situation of molten plastic flow and heat transfer in the screw groove, combined with motion equations and constitutive equation, the energy conservation mathematical model is established in which multiple factors are taken into account. The joint action of the heat conduction, convection, and viscous dissipation in the model describes the heat transfer and the temperature distribution characteristics of dynamic process and stable state. Using finite difference method discrete partial differential equations, and construct linear equations. After the equations had been solved by numerical calculation method within the initial condition and boundary conditions, the temperature results of the three-dimensional flow field are worked out. Analysis of simulation results, get the distribution and change rules of temperature, heat convection, heat transfer, viscous dissipation of heat in screw groove plastic melt, thus can be more in-depth understanding of plasticizing process and its influencing factors. Comparison under the same conditions, the simulation results with the calculation results of commercial software is consistent, verified the validity of the proposed method.

Key words: Energy conservation, Finite difference method, Heat transfer, Molten plastic flow, Numerical methods of calculation