Movement initiation of millimeter particles on a rotating rough surface:The role of adhesion

• 作者: Karina de los ángeles Valenzuela Aracena Rodolfo O. U?ac Irene Ippolito Ana M. Vidales
• 来源期刊: 颗粒学报（英文版）
• 年，卷（期）: 2020,（6）
• 页码范围: 92-99
• 页数: 8页
• 语种: 英文

摘要

We performed experiments to determine the critical moment for movement initiation of a millimeter bead on a rotating rough surface.The corresponding critical angular velocities were measured for glass and stainless-steel ball bearings over two different rough surfaces with glued glass beads.A basic the-oretical analysis was developed to explain the observed results.Although the expectation of a simple approach with the presence of the obstacles offered by a rough surface could be sufficient to describe the problem,we prove here that the sole consideration of these obstacles,and even friction,are insufficient to explain the results in the range of a few-millimeter glass particles.Where the thermodynamic work of adhesion between surfaces is significant,the adhesion forces must be considered in the force balance for particle detachment.This effect is a determinant for describing theoretically and numerically the dynamics of millimeter particles.