Presentation on theme: "Natural convection flow in a cask storage warehouse For Toyo Engineering PHOENICS Version : 3.5.1 DETAILS : BFC grid Three-Dimensional steady flow with."— Presentation transcript:
Natural convection flow in a cask storage warehouse For Toyo Engineering PHOENICS Version : DETAILS : BFC grid Three-Dimensional steady flow with heat transfer Buoyancy-influenced flow Surface to surface radiation included NX*NY*NZ=288*74*42=895,104 NOTES : The purpose of this model is to establish the temperature distribution and the air flow rate.
outlet Heat source : 22.6[kw] Air in Air out cask External temperature 23.2 External temperature 23.2 Q A2A2 A1A1 A1A1 A2A2 Q Radiation model in the cask
Velocity FlowRate[m3/s] per one cask Experimental data Result of PHOENICS
Natural convection flow in a nuclear reactor For Denchuken PHOENICS Version : 3.6 DETAILS : Cylindrical-polar grid Three-Dimensional steady or transient flow with heat transfer Buoyancy-influenced flow Surface to surface radiation included NX*NY*NZ=40*45*80=144,000 NOTES : When an accident happens in the nuclear system, eg the cooling system may fail. Hence, heat will be released solely by natural convection of air flow. The purpose of this model is to establish the distribution of temperature and the air flow rate under these circumstances.
PRACS IHX(Heat sink Q=-28.55[MW]) Liquid Na convection zone Pump(11m 3 /min) Steady::on Transient::off Radial shield Reflector Argon gas zone Air convection zone Air inlet (connected to stack) Air outlet (connected to stack) Air Flow Liquid Na Flow Core (Heat source Q=30[MW]) Structure of porous media zone
Energy source in the porous medium zone : where
Pressure value in the air convection zone boundary : P ITOP i A i [m 2 ]k i [-]n i=1 to 5 i=6 to 10 The value of pressure in the air convection zone boundary is renewed while it is calculated from the next experience equation. P OTOP ΔP f1 ΔP f2 ΔP f3 ΔP f4 ΔP f5 ΔP f6 ΔP f7 ΔP f8 ΔP f9 Δh out Δh in P OUT P IN Δh
Temperature distribution (steady) Maximum temperature [ ] Experimental data Result of PHOENICS
Pressure distribution (steady) Pressure drop [MPa] in Na convection zone Experimental data Result of PHOENICS
Air flow rate in the air convection zone. Maximum temperature in the liquid Na convection zone.
Transient simulation in a vapor turbine PHOENICS Version : DETAILS : Cartesian grid Three-Dimensional transient flow NX*NY*NZ=222×218×98=4,742,808
Inlet of vapor Outlet Air :Fixed temperature Nozzle Box : Fixed temperature