楊馥菱 教授 (Dept. of Mechanical Engineering, NTU)

From collision of two fully-immersed solid particles to the dynamics of a wet granular flow

Abstract
A wet granular flow is the motion of a mixture composed of solid particulates and filling liquids. When the liquid has negligible effects on the mixture behavior, the bulk dynamics can be understood as a dry granular system, which topic has been widely studied for more than 20 years. With the presence of incompressible and viscous liquid, however, new mechanisms arise for bulk momentum transport and energy dissipation. Thus, our knowledge on a wet bulk behavior is still lacking as compared to the numerous existing models for dry granular systems. To understand the overall liquid effects on bulk dynamics, a careful investigation was conducted for collisions between fully-immersed solid particles, both experimentally and theoretically. The findings will be introduced in this presentation as well as its application to the development of a liquid-modified contact model. The proposed contact model has been implemented into a discrete-element simulation (DEM) for wet granular flow dynamics. A few recently obtained numerical results will be presented along with experimental measurements. The matching results help to draw qualitative conclusions of the liquid effects on modifying the dynamics of a granular mixture.

2009 年 3 月 27 日
14:30~15:30

RM 112, New Physics Building