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首页> 外文期刊>Journal of Applied Polymer Science >Effect of volume fraction and particle size on wall slip in flow of polymeric suspensions
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Effect of volume fraction and particle size on wall slip in flow of polymeric suspensions

机译：体积分数和粒径对聚合物悬浮液流动中壁滑的影响

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For especially highly concentrated suspensions, slip at the wall is the controlling phenomenon of their rheological behavior. Upon correction for slip at the wall, concentrated suspensions were observed to have non-Newtonian behavior. In this study, to determine the true rheological behavior of model concentrated suspensions, "multiple gap separation method" was applied using a parallel-disk rheometer. The model suspensions studied were polymethyl methacrylate particles having average particle sizes, in the range of 37-231 mu m, in hydroxyl terminated polybutadiene. The effects of particle size and solid particle volume fraction on the wall slip and the true viscosity of model concentrated suspensions were investigated. It is observed that, as the volume fraction of particles increased, the wall slip velocity and the viscosity corrected for slip effects also increased. In addition, for model suspensions in which the solid volume fraction was >= 81% of the maximum packing fraction, non-Newtonian behavior was observed upon wall slip correction. On the other hand, as the particle size increased, the wall slip velocity was observed to increase and the true viscosity was observed to decrease. (c) 2005 Wiley Periodicals, Inc.
机译：对于特别高浓度的悬浮液，壁面打滑是其流变行为的控制现象。校正壁面的滑移后，观察到浓缩的悬浮液具有非牛顿行为。在这项研究中，为确定模型浓缩悬浮液的真实流变行为，使用平行盘流变仪应用“多间隙分离法”。研究的模型悬浮液是在羟基封端的聚丁二烯中的平均粒径在37-231微米范围内的聚甲基丙烯酸甲酯颗粒。研究了粒径和固体颗粒体积分数对模型浓缩悬浮液的壁滑和真实粘度的影响。观察到，随着颗粒的体积分数增加，壁滑移速度和针对滑移效应校正的粘度也增加。另外，对于固体体积分数> =最大填充分数的81％的模型悬浮液，在壁滑校正后观察到非牛顿行为。另一方面，随着粒径的增加，观察到壁滑速度增加并且观察到真实粘度降低。 （c）2005年Wiley Periodicals，Inc.

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