Numerical Simulation of Particle Flow Motion in a Two-Dimensional Modular Pebble-Bed Reactor with Discrete Element Method

Table 1

Properties of pebbles and simulation parameters [5, 8].

Simulation parameter	Value	Simulation parameter	Value
Density of fuel pebbles (kg/m^3)	1857	Density of graphite pebbles (kg/m^3)	1730
Diameter of fuel pebbles (m)	0.06	Diameter of graphite pebbles (m)	0.06
Normal stiffness of fuel pebbles (N/m)	6.86 × 10^6	Tangential stiffness of fuel pebbles (N/m)	1.96 × 10^6
Normal stiffness of graphite pebbles (N/m)	6.86 × 10^6	Tangential stiffness of graphite (N/m)	1.96 × 10^6
Normal stiffness of wall (N/m)	1 × 10^8	Tangential stiffness of wall (N/m)	2.86 × 10^7
Frictional coefficient between fuel pebbles	0.7	Frictional coefficient between fuel and graphite pebbles	0.7
Frictional coefficient between graphite pebbles	0.7	Time step (s)	5 × 10^−7