A liquid metal flows at the rate of 4kg/s through a constant heat flux 6cm inner diameter tube in a nuclear reactor. The fluid at 200°C is to be heated with the tube wall 40°C above the fluid temperature. Determine the length of the tube required 25°C rise in bulk fluid temperature.

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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A liquid metal flows at the rate of 4kg/s through a constant heat flux
6cm inner diameter tube in a nuclear reactor. The fluid at 200°C is to be
heated with the tube wall 40°C above the fluid temperature. Determine the
length of the tube required 25°C rise in bulk fluid temperature.
Solution:
d.
Red =
0.06
4.
PA
8x10° 7700 (x 0.06)
8.
1.378 A 10"
for
3.6x10 FRed,
according to Holman
9.05x 105
Nuy
4.82+0.0185 (PR) 821
0.827
-4.82 + 0-0185 (1378 x10 x0-011)
- 12.72
12-72 x 12
h=Nud.k
2543.7
こ
%3D
0,06
mp DTE = h A (Tw- To)
4 x 130x 25
A =
243-7 (240-200)
0.12776 m
A= xd. L
Ans.
0.12-776
= 0. 677 m
T X 0.06
Transcribed Image Text:A liquid metal flows at the rate of 4kg/s through a constant heat flux 6cm inner diameter tube in a nuclear reactor. The fluid at 200°C is to be heated with the tube wall 40°C above the fluid temperature. Determine the length of the tube required 25°C rise in bulk fluid temperature. Solution: d. Red = 0.06 4. PA 8x10° 7700 (x 0.06) 8. 1.378 A 10" for 3.6x10 FRed, according to Holman 9.05x 105 Nuy 4.82+0.0185 (PR) 821 0.827 -4.82 + 0-0185 (1378 x10 x0-011) - 12.72 12-72 x 12 h=Nud.k 2543.7 こ %3D 0,06 mp DTE = h A (Tw- To) 4 x 130x 25 A = 243-7 (240-200) 0.12776 m A= xd. L Ans. 0.12-776 = 0. 677 m T X 0.06
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