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A modified model and algorithm for flow-enhanced crystallization - Application to fiber spinning

机译：改进的流动增强结晶模型和算法-在纤维纺丝中的应用

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A modified version of the two-phase flow-induced crystallization model of Doufas et al. (J Non-Newtonian Fluid Mech 2000, 92, 27) for melt spinning of polymeric fibers is presented to address three issues: (1) discontinuities generated due to the imposition of continuation conditions at the crystallization onset at T-m(o); (2) excessive strength of the flow enhancement component coupling the total extra stress tenser invariant to the crystallization kinetics; and (3) Avrami isotherms used. The modified model provides seamless, two-phase predictions for all-state variables in the fiber-spinning process and significantly reduces discontinuities. Moreover, a new component for the flow-induced crystallization rate and Avrami crystallization rate isotherms increase the predictive capability of the model. Quantitative prediction of the velocity, stress, temperature, density (or crystallinity), and birefringence profiles are demonstrated for Nylon 66 and PET melts for a variety of process conditions, including predictions of quenched-sample density profiles and the take-up speed dependence of asspun fiber density. The new algorithm, assisted by the coupling model, provides a more efficient and robust convergence of steady-state calculations and hash been tested to predict spinning phenomena up to spin speeds of 9000 m/min. (c) 2006 Wiley Periodicals, Inc.
机译：Doufas等人的两相流致结晶模型的改进版本。 （J Non-Newtonian Fluid Mech 2000，92，27）提出了用于聚合物纤维的熔融纺丝以解决三个问题：（1）由于在T-m（o）的结晶开始时施加连续条件而产生的不连续性; （2）流动增强组分的过强强度将总的额外应力张量与结晶动力学联系在一起; （3）使用了Avrami等温线。修改后的模型为光纤纺制过程中的所有状态变量提供了无缝的两阶段预测，并显着减少了不连续性。此外，流致结晶速率和Avrami结晶速率等温线的新组成部分提高了模型的预测能力。对尼龙66和PET熔体在各种工艺条件下的速度，应力，温度，密度（或结晶度）和双折射曲线进行了定量预测，包括对淬火样品密度曲线的预测以及对碳纳米管的吸收速度的依赖性。纤维密度新的算法在耦合模型的辅助下，提供了更高效，更稳健的稳态计算收敛性，并且对哈希进行了测试，以预测直至9000 m / min的旋转速度的旋转现象。 （c）2006年Wiley Periodicals，Inc.

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