Wall slip quantification using the classical Mooney slip analysis has produced physically unreasonable results for many complex fluids. Over the past decades, the assumption that the slip velocity is solely dependent on the wall shear stress has therefore been questioned. In this contribution, the influence of the radius of cylindrical dies on the wall slip velocity of highly concentrated non-Brownian suspensions in a high-pressure capillary rheometer is re-examined, by varying the rheology of the liquid phase. Water- and oil-based suspensions (solid volume fraction ~ 0.60, D_4,3 ~ 5 µm) are made using liquid phases that have different flow indices (n = 0.22 – 1.00) and a variation in their thickener concentration (25 g/L – 350 g/L). All classical Mooney plots showed negative y-intercepts and the fit worsened with decreasing flow index. A modification to the Mooney analysis is proposed that includes a geometrical dependency of the slip velocity that scales with the flow index of the liquid phase. Proposed modified Mooney plots not only show positive y-intercepts, but also show a good fit (R² > 0.99) over the entire range of shear rates (10 – 640 s ^− 1) and corresponding wall shear stresses. The geometrical dependency is thought to arise from the shear stress gradient within the extrusion die.

对于许多复杂的流体，使用经典的门尼滑移分析进行壁滑定量的结果在物理上是不合理的。因此，在过去的几十年中，人们一直怀疑滑动速度仅取决于壁切应力。在这一贡献中，通过改变液相的流变性，重新检查了圆柱模具半径对高压毛细管流变仪中高度浓缩的非布朗悬液的壁滑速度的影响。水和油基悬浮液（固体体积分数〜0.60，D _4,3〜5 µm）是使用具有不同流动指数（n = 0.22 – 1.00）和增稠剂浓度的变化（25 g / L – 350 g / L）。所有经典的门尼曲线均显示负y轴截距，并且随着流动指数的降低，拟合度变差。提出了对门尼分析的一种修改，其中包括滑移速度的几何相关性，其随液相的流动指数成比例。拟议的经修改的门尼图不仅显示正y轴截距，而且在整个剪切速率范围（10 – 640 s ^{− 1}）和相应的壁面剪切应力范围内均显示出良好的拟合度（R ² > 0.99）  。几何依赖性被认为是由于挤出模头内的剪切应力梯度引起的。