Determining the coefficient of friction by shear tester simulation
Document typeConference report
Rights accessOpen Access
The ﬂow behaviour of very dense particle regimes such as in a moving or ﬂuidized bed is highly dependent on the inter-particle friction, which can be characterized by the coeﬃcient of friction. Since only rough guide values for common material pairs are available in the literature, we determine the exact parameters by ﬁtting numerical simulations to experimental measurements of a simpliﬁed Jenike shear tester [1, 2]. The open-source discrete-element-method code LIGGGHTS  is used to model the shear cell, which is built of triangulated meshes. In order to preload the bulk solid in the shear cell with a constant principal stress, the movement of these walls is controlled by a prescribed load. A comprehensive sensitivity study shows that the results are nearly insensitive to the spatial dimensions of the shear tester as well as all other material properties. Therefore, this set-up is applicable to determine the coeﬃcient of friction. Furthermore, we calculate the coeﬃcient of friction of glass beads showing very good agreement with literature data and in-house experiments. Hence, this procedure can be used to deduce material parameters for the numerical simulation of dense granular ﬂows.
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