Numerical Simulation of Polymeric Flow in Contraction Channels: Wall Slip and Channel Size Dependent Effects
Numerical Simulation of Polymeric Flow in Contraction Channels: Wall Slip and Channel Size Dependent Effects
复制标题
收缩通道中聚合物流动的数值模拟：壁滑移和通道尺寸相关效应
DOI：
10.1063/1.2204521
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
N. Mori
中科院分区：
文献类型：
--
作者：
A. Sunarso;Takehiro Yamamoto;N. Mori
通过数值模拟研究了壁滑移对宏观和微观收缩通道中聚合物流流动行为的影响。壁滑移为宏观和微观通道中的流动引入了不同的涡增长。随着平均剪切速率的变化，不同的滑移模型引入了不同的滑移速度，影响了收缩附近区域的流型，导致涡增长的趋势不同。壁滑移减少或增加涡流长度取决于滑移的强度和流体的流变特性。对速度和应力场的分析证实了尺度相关效应，例如壁剪切应力对通道尺寸的依赖性。
Numerical simulation has been performed to investigate the effects of wall slip on the flow behaviors of polymeric flows in the macro and micro contraction channels. The wall slip introduces different vortex growths for the flows in macro and micro channels. With the change in average shear rate, the various slip models introduce different slip velocities that affect the flow patterns in the region near the contraction, result in the different trends in vortex growth. The wall slip decreases or increases the vortex length depends on the strength of the slip and rheological properties of the fluid. The analyses on velocity and stress field confirm the scale dependent effects such as the dependence of wall shear stress on the size of channel.