This paper presents a current view of non-Brownian (non-colloidal) suspension rheology; experimental and computational works are compared where possible. The matrix fluids are either Newtonian or viscoelastic; the rigid particles are compact and close to spherical. Volume fractions of 0.5 and below are considered. It is important to move beyond steady simple shearing, so unsteady shearing and uniaxial extensional flows are discussed. Steady shearing is fairly well understood but the extensional flows are not prominent in the literature. In steady shearing with Newtonian matrices the role of friction and the estimation of the average friction coefficient, which reduces as the macroscopic shear stress (or shear rate) increases, is discussed. The ratio of the two normal stress differences to the shear stress is modelled well provided a reasonable value for the average friction coefficient is assumed. With viscoelastic matrices agreement between experiment and theory is less satisfactory. Unsteady and oscillatory flows are surveyed briefly; the prominent hysteresis in oscillatory flows appears to be a frictional effect. While progress has occurred it appears that satisfying agreement between computation and experiment is rare. More attention to rheological and frictional modelling is needed, and improved computational methods may need to be developed.

本文介绍了非布朗（非胶体）悬浮流变学的最新观点。比较实验和计算工作。基质流体是牛顿流体或粘弹性流体。刚性颗粒紧密且接近球形。体积分数在0.5以下。超越稳定的简单剪切非常重要，因此讨论了非恒定剪切和单轴拉伸流。稳态剪切是相当容易理解的，但是拉伸流动在文献中并不突出。在牛顿矩阵的稳态剪切中，讨论了摩擦的作用和平均摩擦系数的估计，该估计随着宏观剪切应力（或剪切速率）的增加而减小。如果假定平均摩擦系数的合理值，则可以很好地模拟两个法向应力差与切应力之比。对于粘弹性矩阵，实验和理论之间的一致性不太令人满意。简要调查了不稳定流量和振荡流量；振荡流动中的显着滞后似乎是摩擦效应。尽管已经取得了进展，但似乎很少有人能在计算和实验之间达成令人满意的协议。需要更多地关注流变和摩擦模型，并且可能需要开发改进的计算方法。振荡流动中的显着滞后似乎是摩擦效应。尽管已经取得了进展，但似乎很少有人能在计算和实验之间达成令人满意的协议。需要更多地关注流变和摩擦模型，并且可能需要开发改进的计算方法。振荡流动中的显着滞后似乎是摩擦效应。尽管已经取得了进展，但似乎很少有人能在计算和实验之间达成令人满意的协议。需要更多地关注流变和摩擦模型，并且可能需要开发改进的计算方法。