AAAR 34th Annual Conference
October 12 - October 16, 2015
Hyatt Regency
Minneapolis, Minnesota, USA
Abstract View
The Micro-particle Capture by a Cylindrical Fiber in a Particulate Aerosol Channel Flow
MING DONG, Lin-ying Bai, Jun Xie, Su-fen Li, Dalian University of Technology
Abstract Number: 300 Working Group: Control Technology
Abstract A soft-sphere discrete element method(DEM) is used for three-dimensional simulations of micro-particle capture by an individual fiber in a laminar channel flow. An inlet-outlet boundary condition is introduced for the particles along the direction of flow and a periodic boundary condition is imposed in the other two directions. The paper foucus on understanding the complex dynamics of the near-fiber particle aggregates, which is observed to include collision of aggregates with the fiber, capture of colliding aggregates by fiber-attached aggregates, bending of fiber-attached aggregates in the direction of the flow, break-up of both fiber-attached and freely transported aggregates, and break-off and re-entrainment of fiber-attached aggregates. These various processes are observed over long time to achieve a state of balance. A dimensionless adhesion parameter is defined and shown to have a dominat effect on the predicted particle capture rate. Particle capture is enhanced by decrease in either fluid viscosity or velocity, such that change in flow Reynolds number can have pultiple effects depending on the variation of the other parameters.