Experimental study of oblique impact of particles on wet surfaces

Abstract

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Effect of Grain Size and Surface Roughness on the Normal Coefficient of Restitution of Single Grains

“…Greater magnitude of oblique rebound angles during collisions are most likely to be the result of morphology influence in terms of particle shape rather than roughness (i.e., meso-scale morphology expressed by particle shape is more crucial compared with micro-to-nano scale morphology expressed with roughness to cause no vertical rebound of the grains). However, oblique rebound angles can also be observed if the experiments were conducted at an impact angle (for example: Sommerfeld and Huber [47], Cruger et al [48], Tang et al [24]).…”

Numerical investigation of collision dynamics of wet particles via force balance

“…For experimental validation mainly results of our previous works (Crüger et al, 2016a;Crüger et al, 2016b;Buck et al, 2017) were used. Additionally, some new experiments were conducted.…”

“…in normal direction by Barnocky and Davis (1988), Hogekamp et al (1994), Davis et al (2002), Kantak et al (2005), Antonyuk et al (2009), Sutkar et al (2015), Gollwitzer et al (2012), Fu et al (2004) as well as in Crüger et al (2016a). Wet oblique collision experiments with thin liquid layers were exemplary conducted by Kantak and Davis (2004), Ma et al (2013Ma et al ( , 2015Ma et al ( , 2016, Crüger et al (2016b), Buck et al (2017). In comparison to collisions immersed in liquid, in the case of thin layers the layer thickness has additionally to be taken into account.…”

“…Contact forces and gravitational force are considered as well as viscous and capillary forces to represent the dissipation of energy in the liquid layer. Previous experimental results of our group Crüger et al (2016a), Crüger et al (2016b) and Buck et al (2017) are used to validate the force balance model for a large range of parameters.…”

Interface‐resolved simulations of normal collisions of spheres on a wet surface

“…Regarding the importance of liquid layer thickness, it was found that the e wet in the normal direction decreases significantly with increasing layer thickness . Conversely, increasing layer thickness has no further effect on the e wet in the tangential direction rather than causing less friction . With respect to the influence of impact velocity, the wet restitution coefficient was found to increase with the impact velocity (beyond a critical value) before leveling out to reach a plateau .…”