Experimental and simulation investigation on diffusion and deposition of transient high-temperature dust in a vertical tee duct

Abstract

In this study, both experiments and computational fluid dynamics simulations were performed to investigate the transport characteristics of transient high-temperature dust in a tee duct. The experimental results showed that there is a cavity downstream of the main duct. The simulation results showed that the second flow was generated downstream, and the high-temperature dust moved to the top of the main duct owing to thermal expansion and buoyancy. The temperature change in the particles depended on the site, and the temperature of the particles in the center was higher than that of the surrounding particles. The thermal expansion and buoyancy of high-temperature fluids affected the particle motion through the drag force. The deposition of particles was wing-like and was mainly present on both sides of the tee duct, which was five times the diameter of the main duct. This study provides theoretical guidance for the development of industrial ventilation systems.