微结构特征对微结构零件注射成型流场均匀性的影响

在Navier-Stokes方程基础上,配合适当边界条件,借助计算流体力学软件CFD-ACE实现了单侧分布矩形微结构、梯形微结构和双侧分布矩形微结构零件模型的流场仿真,得到了三种零件的速度场和剪切速率场.结果表明,单侧矩形微结构零件各微结构截面的速度和剪切速率都有较大差异;单侧梯形微结构零件各微结构截面的剪切速率分布一致,速度分布不一致;双侧矩形微结构零件三个微结构截面的速度和剪切速率都一致.单侧分布梯形微结构零件流场均匀性好于单侧分布矩形微结构零件流场均匀性,双侧分布的微结构零件流场均匀性好于单侧布置的微结构零件流场均匀性.

Effects of Micro Structure Characters on Field Uniformity of Injection Molded Parts with Micro Structures

Numeric simulation of rectangle,trapezoid micro-features on one side and rectangle micro-features on both sides were realized by CFD-ACE software based on Navier-Stokes equations and appropriate boundary conditions.Velocity and shear rate fields of three parts were obtained.Results show that the velocity and shear rate in different cross sections of part with rectangle micro-features on one side are difference.The shear rate in different cross sections of part with trapezoid micro-features on one side is the same,but the velocity is difference.The velocity and shear rate in different cross sections of part with rectangle micro-features on both sides are the same.The field uniformity of part with trapezoid micro-features on one side is better than that of part with rectangle micro-features on one side,and field uniformity of part with micro-features on both sides is better than that of part with micro-features on one side.