Operating parameters for a PWR hot channel is given below.
Compute and plot the mixture and phase velocity
distributions.
Determine the individual components of and the total pressure drop.
Compare the results obtained
using both equilibrium and non equilibrium models.
You may assume the saturation properties are constant along
the length of the channel and may be evaluated at the system pressure.
PRESSURIZED WATER REACTOR PARAMETERS
Pressure
2250 psia
Coolant Mass Flux
2.50 x 10
6
lbm/hr-ft
2
Core Inlet Temperature
545 F
Maximum Core Heat Flux
580,000 Btu/hr-ft
2
Rod Pitch
0.563 inches
Rod Diameter
0.422 inches
Fuel Height
144 inches
Upper and Lower Tie Plate Loss Coefficient
3.5
Grid Loss Coefficient
0.5
Number of Grids/assembly
8
Axial Peak to Average Ratio
1.5
The axial heat flux may be taken to be
′′
′′
+
⎛
⎝
⎜
⎞
⎠
⎟
q
z
q
z
H
e
( )
sin
(
)
=
0
π
λ
You may assume the two-phase friction multiplier is given by the expression
75
.
1
2
2
)
1
(
1
20
1
x
o
−
⎟
⎟
⎠
⎞
⎜
⎜
⎝
⎛
+
+
=
χ
χ
φ
A
where
χ
is the turbulent Martinelli parameter and given by
χ
μ
μ
ρ
ρ
2
0 2
1 8
1
=
⎛
⎝
⎜
⎜
⎞
⎠
⎟
⎟
−
⎛
⎝
⎜
⎞
⎠
⎟
⎛
⎝
⎜
⎜
⎞
⎠
⎟
⎟
f
g
g
f
x
x
.
.
and that the Homogeneous Multiplier derived in class is valid for the local losses.

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