Modeling of polymer melting, drop deformation, and breakup under shear flow
Modeling of polymer melting, drop deformation, and breakup under shear flow
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DOI：
10.1002/pen.20121
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发表时间：
2004-07
影响因子：
3.2
通讯作者：
Hongbing Chen;U. Sundararaj;K. Nandakumar
中科院分区：
文献类型：
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作者：
Hongbing Chen;U. Sundararaj;K. Nandakumar
采用数值模拟的方法研究了聚乙烯（PE）和聚碳酸酯（PC）液滴在剪切流场中的变形和破碎机理。采用FIDAP中的VOF方法跟踪动态界面。建立了PE/PE系统和PE/PC系统两个模型。聚合物的性质，如比热容，粘度和导热系数的实验数据，被纳入模拟。对于PE/PE体系，基体PE和分散的PE使用温度依赖性粘度模型。对于PE/PC体系，PE和PC的广义粘度模型与时间相关的移动边界。在简单剪切流动下，PE熔体中PE和PC的变形和破裂与以前的实验中观察到的侵蚀机制相似。局部流动信息，如温度，剪切速率，粘度和剪切应力，从模拟结果中获得。无论是分散相还是基体相，界面处的剪切应力都远大于基体相的剪切应力，这可以解释冲蚀破碎的机理。Polym.工程科学44：1258-1266，2004.© 2004年塑料工程师协会。
Polyethylene (PE) or polycarbonate (PC) drop deformation and the breakup mechanism in a PE melt under shear flow were investigated using numerical simulations. The volume of fluid (VOF) method in FIDAP was used to track the dynamic interface. Two models were built for the investigation of a PE/PE system and a PE/PC system. Experimental data of polymer properties, such as specific heat capacity, viscosity, and heat conductivity, were incorporated in the simulations. For the PE/PE system, a temperature-dependent viscosity model was used for the matrix PE and the dispersed PE. For the PE/PC system, generalized viscosity models were used for PE and PC with time-dependent moving boundaries. An erosion mechanism similar to that observed in previous experiments was found for deformation and breakup of both PE and PC in the PE melt under simple shear flow. Local flow information, such as temperature, shear rate, viscosity, and shear stress, was obtained from the simulation results. The shear stress at the interface was much higher than the shear stress either in the dispersed phase or in the matrix phase, which could explain the erosion breakup mechanism. Polym. Eng. Sci. 44:1258–1266, 2004. © 2004 Society of Plastics Engineers.