Effect of the Lagrangian integral time scale estimation on particle deposition

In a high temperature pebble-bed reactor, carbonaceous dust is conveyed by the cooling carrier phase and eventually deposits in the primary circuit of the reactor. In hypothetical severe accident, a dose of radioactive graphite dust may escape the system boundaries. The accurate prediction of transport and deposition of graphite particles is therefore a key primary safety issue.The numerical prediction of carbonaceous dust transport and deposition in turbulent flows is a key safety issue. Most particle tracking procedures make use of the Lagrangian integral time scale to reproduce the turbulent dispersion of the discrete phase. In the present Lagrangian particle tracking procedure, the effect of the Lagrangian integral time scale near the wall is thoroughly investigated.