关键词: 流动控制方程, 螺槽, 熔融塑料, 速度场, 应力场

Abstract: The status of molten polymer flow needs to be made clear when it is processed in the screw groove with action of various factors. The time based partial differential equations, includes continuity equation, momentum conservation equations and constitutive equation of molten polymer flow are deduced from physics principles of fluid movement. And physical model is established for screw processing considering the situation of force, movement of molten polymer flow. The partial differential equations are discretized to form algebraic equation set by finite difference method. On the basis of the equations and the physical model, the velocity isoline, velocity vector distribution, share stress distribution and pressure distribution of molten polymer flow in engineering practice are solved by applying the numerical calculation methods. The analysis of the results which worked out according to the actual screw parameters in industry reveals the rules of molten polymer flow in the screw groove. The rules includes: The velocity and shear stress are close to zero in the corner of left bottom and right bottom; The molten polymer move in a spiral track as a whole, and is acted by alterative shear stress and press. These rules are helpful for improving quality of plastic products and facility performance.

Key words: Flow control equation, Molten polymer, Screw groove, Stress field, Velocity field