Investigating effects of BCC and FCC arrangements on flow and heat transfer characteristics in pebbles through CFD methodology

The Effect Of Turbulence Models On Coolant Temperature And Velocity For The Pebble-Bed Typed High Temperature Reactor

“…The RSM closes the Reynolds-averaged Navier-Stokes equations by solving transport equations for the Reynolds stresses, together with an equation for the dissipation rate. The equation of RMS is similar to the research has investigated the effect of FCC [7].…”

“…A realistic pebble arrangement for a pebble-bed reactor core is combination of different structured arrangements and it is crucial to investigate the effects of pebble arrangement on the thermal-hydraulics characteristic for safety operation [7]. Therefore the investigation of turbulence models based on different pebble arrangements is required as well to be investigated.…”

“…Therefore, the safety analysis using CFD code could inform the transient accident condition due to air ingress [4] as well as water ingress with detail temperature distribution in reactor core. The utilization of RSM has been investigated for relation of Nu number on different pebble layers under variable particle Reynold number [5], loss of coolant accident [6], and modeling height of 0.2 m [7]. Hence, RSM could be used as analysis comparator standard in this research.…”

Computational fluid dynamics investigation of thermal-hydraulic characteristics in a simplified pebbled bed modular reactor core using different arrangements of fuel elements

“…Four main surfaces along x-and y-axis are symmetry boundaries, which means that the velocity and scalar variable gradients are set to 0 in this kind of plane. The inlet is located at z ¼ 0.2 m, and He is injected from inlet at a special velocity with a fixed temperature of 523 C. According to Ferng and Lin,6 the outlet is located at À1.0 m, which is far away from the last layer of pebbles to prevent the reversed flow during the simulation. In addition, a near wall arrangement is adopted at the wall boundary.…”

“…Based on the outstanding work carried out by Ferng and Lin, 6 we adopt the numerical methods to simulate more arrangements of pebbles. In the real pebble reactor, the fuel elements are arranged randomly.…”