... values of P and R as given by Fig. 11.11 with
(
)
(
)
(
)
(
)
P 953 5/300 350 .23R300196/120 351 .22=−−==−−=
giving F ≈ 1. Based upon CF arrangement,
(
)
(
)
(
)
(
)
m,CF
T300 951 9635C/n300 95/ 196.2 351 82K.
∆=−−−°−−=
l
l
Using ... 210.45W/K C C 755 .25W K
== ==
.
Hence, C
min
/C
max
= 0.279 and
()
max min h,i c,i
q C T T 210. 45 W K (100 K) 21,045W
=−= =
max
q q 14,732W 2...
... and only for surface and surrounding
temperature differences of 50 to 100°C.
Coefficients (W/m
2
⋅K)
T
s
(°C) ε
h
r
h
r,a
h
35 0. 05 0.32 0.32 2.1
0.9 5. 7 5. 7
1 35 0. 05 0 .51 0 .50 ... m)
2
( 85 - 15)
°
C = 0. 35 W.
<
In the dielectric liquid
P
max
= 3000 W/m
2
⋅
K(0.0 05 m)
2
( 85- 15)
°
C = 5. 25 W.
<
COMMENTS: Relative to liqui...
... for q
sh - d
/
q
tot
=
0 .5, 1 or 1 .5
%
was computed and plotted as a function of the sample emissivity.
0. 05 0. 15 0. 25 0. 35
Sample emissivity, epss
50
100
150
200
250
Shield temperature, Th ... 0 .55 9 0.7 15
=+ =⋅
+
(5)
With values of
ε
and
α
from part (a), the rate of temperature change with time is
() ()
824 2 8244
s
3
4 0...
... 13 .5 or Table 13 .5,
()
1/2
2
2
14 4 1
F 0 .5 S S 4 r /r
=−−
(5)
()
1/2
2
2
14
F 0 .5 5.01 5. 01 4 15/ 150 0.001997
=−− =
22
4
22
1
1 R 1 0. 05
S 1 1 5. 010
R0 .5
++
=+ ... of heat transfer to tube without ash deposit, (b) Rate of heat transfer with an ash deposit
of diameter D
d
= 0.06 m, (c) Effect of deposit diameter and con...