Boiling Heat Transfer 22
1
For the BWR operating parameters given below, compute and plot:
a)
The clad surface temperature assuming the JensLottes Correlation
b)
The clad surface temperature assuming the Thom Correlation
c)
The clad surface temperature assuming the Chen Correlation
You can neglect the mixed boiling region and assume the transition point from single phase forced convection to
nucleate boiling in the JensLottes and Thom Correlations occurs at that point
z
b
, such that
m
m
b
sat
c
b
b
z
q
T
h
z
q
z
T
1
1
6
10
)
(
)
(
)
(
⎟
⎠
⎞
⎜
⎝
⎛
′
′
+
=
′
′
+
−
∞
ς
i.e., the wall temperature is continuous at the transition point.
In the Chen correlation, substitute the Weisman
correlation for the DittusBoelter correlation in
o
h
A
.
Discuss your results.
BOILING WATER REACTOR PARAMETERS
Channel Heat Input
350,000 Btu/hr
Channel Mass Flux
1.42 x 10
6
lbm/hrft
2
Rod Pitch
0.640 inches
Rod Diameter
0.493 inches
Channel Pressure
1000 psia
Channel Height
146 inches
Inlet Temperature
532 F
⎟
⎠
⎞
⎜
⎝
⎛
⎟
⎠
⎞
⎜
⎝
⎛
′
′
′
′
H
z
H
H
z
H
q
z
q
)

(
sin
)

(
=
)
(
0
π
π
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