1. An electric resistor, R = 0.1 in, is steadily generating heat at a rate of q”’ = 5E7 Btu/h·ft 3.

1. An electric resistor, R = 0.1 in, is steadily generating
heat at a rate of q___ = 5E7 Btu/h·ft3. The
centerline temperature is maintained at 300 F, find surface temperature,
surface heat flux, and q_ . k = 50 Btu/ft·h·F.

2. A fuel rod of a PWR consists of about 320 solid fuel
pellets inside a zircaloy cladding. Use the specified data to plot the
distribution of temperature in the fuel rod. The temperature distribution
should include the fuel region, the gap region, the cladding region, and end at
the bulk coolant for two cases of low and high linear heat generation rates.
Data:

DFuel =
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1. An electric resistor, R = 0.1 in, is steadily generating
heat at a rate of q___ = 5E7 Btu/h·ft3. The
centerline temperature is maintained at 300 F, find surface temperature,
surface heat flux, and q_ . k = 50 Btu/ft·h·F.

2. A fuel rod of a PWR consists of about 320 solid fuel
pellets inside a zircaloy cladding. Use the specified data to plot the
distribution of temperature in the fuel rod. The temperature distribution
should include the fuel region, the gap region, the cladding region, and end at
the bulk coolant for two cases of low and high linear heat generation rates.
Data:

DFuel = 0.96 cm, DInside Clad = 0.985
cm, DOutside Clad = 1.12 cm, kFuel = 1.73 W/m C, kClad
= 5.2 W/m·C, TWater = 300 C, qLow _ = 5 kW/ft (164
W/cm), and qHigh _ = 15 kW/ft (492 W/cm).

The heat transfer coefficient from the fuel rod to bulk
coolant is 34 kW/m2 ·C. The heat transfer coefficient in the gap
region is 5.7 kW/m2 ·C for the low and is 11.4 kW/m2 ·C
for the high linear heat generation rate.

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