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首页> 外文期刊>Journal of Applied Polymer Science >Slip velocity and slip layer thickness in flow of concentrated suspensions
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Slip velocity and slip layer thickness in flow of concentrated suspensions

机译：浓缩悬浮液中的滑移速度和滑移层厚度

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The rheological characterization of highly filled suspensions consisting of a Newtonian matrix (hydroxyl-terminated polybutadiene), mixed with two different sizes of aluminum powder (30% and above by volume) and two different sizes of glass beads (50% and above by volume), was performed using a parallel disk rheometer with emphasis on the wall slip phenomenon. The effects of the solid content, particle size, type of solid particle material, and temperature on slip velocity and slip layer thickness were investigated. Suspensions of small particles of aluminum (mean diameter of 5.03 mu m) did not show slip at any concentration up to the maximum packing fraction. However, suspensions of the other particles exhibited slip at the wall, at concentrations close to their maximum packing fraction. In these suspensions, the slip velocity increased linearly with the shear stress, and at constant shear stress, the slip velocity increased with increasing temperature. The slip layer thickness increased proportionally with increasing size of the particles for the glass beads. Up to a certain value of (filler content/maximum packing fraction), phi/phi(m), the slip layer thickness divided by the particle diameter, delta/D-P, was 0, but it suddenly increased and reached a value that was independent of phi/phi(m) and the temperature. On average, the ratio of delta/D-P was 0.071 for aluminum and 0.037 for glass beads. (C) 1998 John Wiley & Sons, Inc. [References: 13]
机译：由牛顿基质（羟基封端的聚丁二烯），两种不同尺寸的铝粉（体积百分比为30％及以上）和两种不同尺寸的玻璃珠（体积百分比为50％以上）混合而成的高填充悬浮液的流变学特性使用平行盘流变仪进行，重点是壁滑现象。研究了固含量，粒度，固体颗粒材料的类型和温度对滑移速度和滑移层厚度的影响。铝的小颗粒（平均直径为5.03微米）的悬浮液在任何浓度下都不会显示滑移，直到最大填充分数。但是，其他颗粒的悬浮液在接近其最大堆积比的浓度下在壁上显示出滑移。在这些悬架中，滑移速度随切应力线性增加，在恒定切应力下，滑移速度随温度升高而增加。滑动层的厚度与玻璃珠的颗粒尺寸成比例地增加。直到（填料含量/最大填充分数）phi / phi（m）的某个值，滑移层厚度除以粒径delta / DP均为0，但突然增加并达到独立的值phi / phi（m）和温度的关系。平均而言，Δ/ D-P的比率对于铝是0.071，对于玻璃珠是0.037。 （C）1998 John Wiley＆Sons，Inc. [参考：13]

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