Tripura Bitang Kwrung, Kumar Sonu, Anyam Vamsi Krishna Reddy, Reddy K Anki
Department of Chemical Engineering, Indian Institute of Technology, Guwahati 781039, Assam, India.
Phys Rev E. 2022 Jul;106(1-1):014901. doi: 10.1103/PhysRevE.106.014901.
The main aim of our work is to explore the effect of particle shape heterogeneity on the dynamics of an intruder moving through a two-dimensional mixture of dumbbells and disks. In spite of similar physical conditions (the mass of the dumbbell is the same as that of the disk) and the same area fraction, we noticed a significant difference in the drag experienced by the intruder as the mixture concentration varies. The propagation of stress from the intruder to the granular grains manifests in the form of force chains, and interestingly these force chains can vary significantly depending on the shape of the grains. These differences, however, appear to be suppressed in the frictionless case where the force chains cannot extend very far from the initial point of contact. Apart from particle shape, the effect of the area fraction of the system and the size of the intruder have also been explored. As the area fraction increases, the drag force on the intruder increases owing to the increase in the contact forces. Finally, we present the velocity and stress fields at different dumbbell fractions and for various intruder diameters to show the effect of the moving intruder on its surrounding particles.
我们工作的主要目的是探究颗粒形状异质性对穿过哑铃状颗粒和盘状颗粒二维混合物的侵入体动力学的影响。尽管物理条件相似（哑铃状颗粒的质量与盘状颗粒相同）且面积分数相同，但我们注意到随着混合物浓度的变化，侵入体所受的阻力存在显著差异。应力从侵入体向颗粒的传播以力链的形式表现出来，有趣的是，这些力链会因颗粒形状的不同而有很大差异。然而，在无摩擦的情况下，这些差异似乎会受到抑制，因为在这种情况下力链无法从初始接触点延伸很远。除了颗粒形状外，我们还探究了系统面积分数和侵入体尺寸的影响。随着面积分数的增加，由于接触力的增加，侵入体上的阻力也会增加。最后，我们给出了不同哑铃状颗粒分数和各种侵入体直径下的速度场和应力场，以展示移动的侵入体对其周围颗粒的影响。
