Boundary-element method simulation of the impact of bounding walls on the dynamics of a particle group freely moving in a wide-gap Couette flow

• Published in: Applied energy 2006-07, Vol.83 (7), p.669-680
• Main Authors: Lin, Wenxian, Yi, Jidong, Graham, A.L., Liu, Tao, Xia, Chaofeng, Ingber, M.S., Leggoe, J.W., Abbott, J.R.
• Format: Article
• Language: English
• Subjects: Applied sciences; Boundary-element method; Boundary-element method Particle migration Wide-gap Couette flow Bounding wall Inhomogeneous shear flow; Bounding wall; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Inhomogeneous shear flow; Particle migration; Theoretical studies. Data and constants. Metering; Thermodynamics, mechanics etc. For energy applications; Wide-gap Couette flow
• ISSN: 0306-2619; 1872-9118
• DOI: 10.1016/j.apenergy.2005.07.002

In this study, the impact of the bounding walls on the dynamics of a group of neutrally-buoyant identical rigid spheres freely moving at negligible Reynolds numbers in a wide-gap Couette flow, which is important for understanding the particle migrations presented in concentrated suspensions subjected to inhomogeneous shear flows, is simulated by a three-dimensional boundary-element method (BEM) code. The results show that the particle interactions very close to the bounding walls cause the particle group to migrate away from the walls. As the distance of the bounding walls from the group increases, the migration changes direction and the group then move towards the walls. As this distance continues to increase, the migration of the group decreases and beyond a specific distance from the bounding walls the migration of the group is negligible. In addition, the BEM simulations show that the extent and rate of the migration of the group increase as the inter-particle distance decreases.