Deposition model of corrosion particles with multi-mechanism coupling in flowing LBE

The accumulation of corrosion products on pipe walls can degrade thermal and flow performance in lead-cooled fast reactor. The objective of this paper is to predict the deposition rates of corrosion products in lead–bismuth eutectic (LBE) using Eulerian deposition model. The model takes into account Brownian diffusion, turbulent diffusion, thermophoresis deposition and convective deposition with acceleration, turbophoresis and steady-state viscous drag. The model also considers the virtual mass force and buoyancy acting on the particles in the high density LBE. Based on the modified model, this paper analyses the mechanism of corrosion particles deposition and investigates the effects of various factors on the deposition rate in detail. Results indicate that diffusion is the primary deposition mechanism of small particles. Both wall roughness and thermophoresis significantly influence particle deposition rate of small particles on the wall. Buoyancy and LBE flow rate also have a significant impact on the particle deposition rate.