Investigation on fine particle deposition characteristics in narrow rectangular channel based on Eulerian-Lagrangian method

To investigate the deposition characteristics of particles within narrow rectangular channels, the deposition process of particles was conducted based on the Eulerian-Lagrangian method. The model incorporating particle rebound, deposition and removal was established to predict the particle deposition behavior. Particle deposition under diverse operating conditions, including inlet velocity, heat flux, particle concentration, particle type, and working fluid, were studied. The results indicated that the asymptotic values of deposition mass degraded significantly with increase of inlet velocity, and upgraded with particle concentration. The high temperature gradient induced high thermophoretic force, which slightly reduced the deposition mass for dp = 10 μm. Furthermore, it observed that the deposition mass of Al was significantly higher than SiO2 at dp = 5 μm, however, basically identical for dp = 10 μm and dp = 20 μm. Shear stress had a distinct effect on removal rate and deposition mass. Supercritical carbon dioxide (SC-CO2) had the largest deposition mass compared to other fluids at the same Reynolds number. This research could be applied to simulate the particle deposition process in narrow rectangular channels of plate fuel elements.