| 螺杆加工塑料时熔体流动的数值模拟 |
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| 引用本文： | 李凌丰,刘际轩,茅旭飞.螺杆加工塑料时熔体流动的数值模拟[J].机械工程学报,2011,47(24). |
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| 作者姓名： | 李凌丰 刘际轩 茅旭飞 |
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| 作者单位： | 浙江大学机械工程学系 杭州310027 |
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| 基金项目： | 国家科技支撑计划(2007BAF13B03); 浙江省自然科学基金(Y106655)资助项目 |
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| 摘 要： | 为了解螺杆加工塑料时多因素交变作用下熔融塑料在螺槽中的流动状况,结合塑化时熔融塑料在螺槽中的受力、运动情况建立物理模型,推导基于时间过程的控制熔融塑料流动的偏微分方程,包括连续性方程、动量方程、本构方程.利用有限差分法离散偏微分方程得到代数方程组,通过数值计算方法,求解得到加工低密度聚乙烯(Low density polyethylene,LDPE)时熔融塑料在螺槽中流动的速度分布、切应力分布、压力分布.以工程中实际应用的螺杆参数为例计算,分析计算结果发现以下规律:在螺槽左下角和右下角部位熔融塑料流动速度和切应力基本为0；熔融塑料在螺槽中作螺旋形的总体运动,并受不同方向的交变切应力、压力作用.这些规律为改善设备性能和提高塑料加工质量提供指导作用.
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| 关 键 词： | 螺槽 熔融塑料 流动控制方程 速度场 应力场 |
Study on Simulation of Molten Polymer Flow in the Screw Groove |
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| LI Lingfeng
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LIU Jixuan
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MAO Xufei.Study on Simulation of Molten Polymer Flow in the Screw Groove[J].Chinese Journal of Mechanical Engineering,2011,47(24). |
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| Authors: | LI Lingfeng LIU Jixuan MAO Xufei |
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| Affiliation: | LI Lingfeng LIU Jixuan MAO Xufei(Department of Mechanical Engineering,Zhejiang University,Hangzhou 310027) |
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| 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 ... |
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| Keywords: | Screw groove Molten polymer Flow control equation Velocity field Stress field |
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