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The Polyflow System Studies on the Effect of Flow Conditions on the Extrudate Swell

机译:多流系统研究流动条件对挤出物膨胀的影响

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The POLYFLOW techniques were applied to model the polymer stream (Barrus effect, the surface problem) that leaves the shaping channel, e.g., an exruder head, in an isothermal viscous and in a viscoelastic flow. the viscous Newtonian and generalized Newtonian (in terms of Bird-Carreau's model) flows and the viscoelastic flow were modeled, the latter by using the differential Maxwell and the integral Kaye-Bernstein-Kearsley-Zapas (KBKZ) models. Extrudate swell was studied in relation to polymer rate, shaping-channel geometry, and material model (Figs. 6-9). Results were in fair agreement with experiment tal data. The simple (two-parameter) Maxwell equation proved to be the most suitable rheological eequation to model the extrudate swell, except at high flow rates where some limitations arise.
机译:应用POLYFLOW技术对在等温粘性和粘弹性流中离开成形通道(例如挤出机头)的聚合物流(Barrus效应,表面问题)进行建模。对粘性牛顿流和广义牛顿流(就Bird-Carreau模型而言)和粘弹性流进行了建模,后者使用微分麦克斯韦和积分Kaye-Bernstein-Kearsley-Zapas(KBKZ)模型进行了建模。研究了与聚合物速率,成型通道的几何形状和材料模型有关的挤出物溶胀(图6-9)。结果与实验数据完全吻合。简单的(两参数)麦克斯韦方程被证明是模拟挤出物溶胀的最合适的流变方程,除非在高流速下会出现一些限制。

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