Natural convection flow in a cask storage warehouse For Toyo Engineering

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Natural convection flow in a cask storage
warehouseFor Toyo Engineering

• PHOENICS Version 3.5.1
• DETAILS
• BFC grid
• Three-Dimensional steady flow with heat transfer
• Buoyancy-influenced flow
• Surface to surface radiation included
• NXNYNZ2887442895,104
• NOTES
• The purpose of this model is to establish
• the temperature distribution and the air
  flow rate .

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Geometry
x-y plane nxnz28842
x-y plane nxny28874
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outlet
outlet
outlet
outlet
External temperature 23.2?
External temperature 23.2?
Radiation model in the cask
cask
Air out
Heat source 22.6kw
Air in
4
Result
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Velocity
FlowRatem3/s per one cask
Experimental data
0.28
0.3
Result of PHOENICS
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Temperature
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Natural convection flow in a nuclear reactorFor
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
• NXNYNZ404580144,000
• 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.

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Air outlet (connected to stack)
Air inlet (connected to stack)
PRACS
IHX(Heat sink Q-28.55MW)
Argon gas zone
Liquid Na convection zone
Pump(11m3/min) Steadyon Transientoff
Air convection zone
Radial shield
Reflector
Core (Heat source Q30MW)
Structure of porous media zone
Air Flow
Liquid Na Flow
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Boundary conditions
Heat source and Heat sink
Steady-28.55MW Transient0WM
Steady30MW Transient change profile
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Pump power
Steady11m3/s Transient change profile.
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Body force (Buoyancy)
Liquid Na convection zone
Air convection zone
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Resistance force in the porous medium zone
where K Pressure resistance coefficient. (This
is different in each zone) ?density Uvelocity
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Radiation
????
????
?????
Q1
Q2
radiation
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Energy source in the porous medium zone
where
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Pressure value in the air convection zone
boundary
The value of pressure in the air convection zone
boundary is renewed while it is calculated from
the next experience equation.
i6 to 10
i1 to 5
PITOP
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Result
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Maximum temperature ?
Experimental data
550
540.6699
Result of PHOENICS
Temperature distribution (steady)
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Pressure drop MPa in Na convection zone
Experimental data
2.5
2.51
Result of PHOENICS
Pressure distribution (steady)
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Air flow rate in the air convection zone.
Maximum temperature in the liquid Na convection
zone.
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Transient simulation in a vapor turbine

• PHOENICS Version 3.5.0
• DETAILS
• Cartesian grid
• Three-Dimensional transient flow
• NXNYNZ222218984,742,808

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Air Fixed temperature
???????
Inlet of vapor
Inlet of vapor
Outlet
Nozzle Box Fixed temperature
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RESULT
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(No Transcript)
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SLICE
POINT1
POINT2