Study on particle transport and deposition in a ventilated trapezoidal chamber

Abstract

Dust control in machining brittle materials is critical for ensuring safety in production, for which ventilation through pipes and chambers is an effective means. Although particle transport and deposition inside pipes have been widely explored, limited attention has been given to those in a chamber, especially for a trapezoidal one, and the transport and deposition of particles inside such a chamber remain elusive. This study aims to address this issue through numerical simulations. Specifically, a group of particles is initially distributed on the inlet cross-sectional surface of the chamber according to the local fluid velocity, and is released and blown into the chamber at a certain instant. Herein, one-way coupling between the fluid and particles is considered, and a particle transport and deposition-rebound model based on Johnson–Kendall–Roberts (JKR) theory is employed. The influences of inlet velocity and particle size on particle transport and deposition are explored. The results reveal that the particle deposition rate and escape rate increase with inlet velocity, resulting in shorter residence time for particles in the chamber. Smaller particles typically have higher escape rates and lower deposition rates. The effects of fluid dynamics on particle transport and deposition are also analyzed.