A numerical study on slip correction factor of dust particle in HTGR

The movement of dust particle has important effects on the safe operation of HTGRs. Since most of the dust particle sizes in an HTGR are on the order of microns, the influence of the slip boundary on the particle movement needs to be considered. The present study uses computational fluid dynamics (CFD) models with a slip velocity to analyze the impacts of the velocity, pressure, temperature of helium and particle diameter on the slip correction factor in an HTGR. The results show that the slip correction factor is little affected by the flow velocity and it increases noticeably as the temperature increases, while it decreases when the pressure and diameter increase. The numerical simulation results are expressed as a simple polynomial correlation for 0.01 < Kn < 0.1 and compared with experimental result in the standard condition of helium. In addition, the effects of non-spherical particles on slip correction factors are discussed to demonstrate the applicability of the spherical hypothesis for the analysis of particle movement in an HTGR.