Flow properties of flexible fibers are poorly understood compared to those of rigid particles. In this study, a Schulze ring shear tester is used to measure the flow properties of fibers made of cut fishing wire and cut rubber cord, which have different levels of flexibility. For a comprehensive study, the discrete element method is employed to simulate flexible fiber flows. The simulations are validated by comparing with the experimental measurements. Studies show that an increase in fiber bending modulus leads to a reduction in the deformation and solid volume fraction, but it has no effect on the shear stress with the same normal stress. An increase in fiber‐fiber friction coefficient, below a critical value of 0.8, can augment the angle of internal friction. The contact stiffness, contact damping coefficient, and bond damping coefficient only have limited impact on the shear flow behavior in the ranges considered. © 2018 American Institute of Chemical Engineers AIChE J, 65: 64–74, 2019

中文翻译：

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正常应力固定剪切单元中柔性纤维流动的计算和实验研究

与刚性颗粒相比，人们对柔性纤维的流动性能了解甚少。在这项研究中，使用Schulze环形剪切测试仪来测量由切割的钓鱼线和切割的橡胶帘线制成的纤维的流动特性，这些纤维具有不同的柔韧性。为了进行全面的研究，采用离散元方法来模拟柔性纤维的流动。通过与实验测量值进行比较来验证仿真。研究表明，纤维弯曲模量的增加会导致变形和固体体积分数的减少，但对具有相同法向应力的剪切应力没有影响。纤维-纤维摩擦系数的增加（低于临界值0.8）会增加内部摩擦的角度。接触刚度，接触阻尼系数，在所考虑的范围内，粘结阻尼系数和粘结阻尼系数仅对剪切流动行为产生有限的影响。©2018美国化学工程师学会AIChE J，65：64–74，2019