Experimental study on the rebound characteristics of oblique collision of ash particles and the influence of ammonium bisulfate. Issue 11 (29th September 2022) - Hu, Shihao
Abstract: The rebound characteristics of oblique collisions of ash particles in a tail flue environment were investigated experimentally. A high speed camera was used to conduct research on the microscopic scale in a temperature and airflow environment similar to the low-temperature region of boiler. Furthermore, this work focused on the influence of impact velocity, impact angle, gas temperature, and ammonium bisulfate on the restitution coefficient. The results indicated that, as the impact velocity increased from 0.4 to 3 m/s, the normal restitution coefficient increased gradually, the tangential restitution coefficient decreased, and the global restitution coefficient remained unchanged. As the impact angle increased from 15° to 75°, the normal restitution coefficient increased and then tended to be stable. The tangential restitution coefficient decreased, reached its minimum value at 60°, and then rose as the impact angle increased. The global restitution coefficient decreased monotonically with an increase of the impact angle. However, in the temperature range of this experiment (250–400 °C), the effect of temperature on the rebound characteristics was not significant. The critical velocity of the ash particles was 0.103 m/s, and the sliding friction coefficient between the ash particles and the target plane was determined to be 0.182. ABS reduced the rebound velocity and rebound angle of ash particles, and the influence of the ABS coating was greater than that of the ABS blending. The impact of ABS on the rebound characteristics of ash particles was mainly reflected in the reduction of normal rebound velocity rather than tangential rebound velocity. Copyright © 2022 American Association for Aerosol Research