Required information A cylindrical fuel rod (k = 30 W/m K) of 2 cm in diameter is encased in a concentric tube and cooled by water. The fuel rod generates heat uniformly at a rate of 100 MW/m, and the average temperature of the cooling water is 80°C with a convection heat transfer coefficient of 2500 W/m-K. The operating pressure of the cooling water is such that the surface temperature of the fuel rod must be kept below 200°C to avoid the cooling water from reaching the critical heat flux (CHF). The critical heat flux is a thermal limit at which a boiling crisis can occur that cause overheating on the fuel rod surface and lead to damage. T(r.) é sen = 100 MW/m3 Cooling water Fuel rod D=2 cm

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
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Chapter7: Forced Convection Inside Tubes And Ducts
Section: Chapter Questions
Problem 7.4P
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Required information
A cylindrical fuel rod (k = 30 W/m K) of 2 cm in diameter is encased in a concentric tube and cooled by water. The fuel rod
generates heat uniformly at a rate of 100 MW/m³, and the average temperature of the cooling water is 80°C with a
conveçtion heat transfer coefficient of 2500 W/m K. The operating pressure of the cooling water is such that the surface
temperature of the fuel rod must be kept below 200°C to avoid the cooling water from reaching the critical heat flux (CHF).
The critical heat flux is a thermal limit at which a boiling crisis can occur that cause overheating on the fuel rod surface and
lead to damage.
T(r.)
é sen =
100 MW/m³
3.
Cooling water
Fuel rod
D=D2 cm
2500 W/m2-K
Determine the temperature at the centerline of the rod. (Round your answer to the nearest whole number)
(You must provide an answer before moving to the next part.)
< Prev
of 6 E
Next >
5 6
18°C Clear
へロ 註EN
N
Transcribed Image Text:Required information A cylindrical fuel rod (k = 30 W/m K) of 2 cm in diameter is encased in a concentric tube and cooled by water. The fuel rod generates heat uniformly at a rate of 100 MW/m³, and the average temperature of the cooling water is 80°C with a conveçtion heat transfer coefficient of 2500 W/m K. The operating pressure of the cooling water is such that the surface temperature of the fuel rod must be kept below 200°C to avoid the cooling water from reaching the critical heat flux (CHF). The critical heat flux is a thermal limit at which a boiling crisis can occur that cause overheating on the fuel rod surface and lead to damage. T(r.) é sen = 100 MW/m³ 3. Cooling water Fuel rod D=D2 cm 2500 W/m2-K Determine the temperature at the centerline of the rod. (Round your answer to the nearest whole number) (You must provide an answer before moving to the next part.) < Prev of 6 E Next > 5 6 18°C Clear へロ 註EN N
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