Question

Q) A fuel plate is fabricated from 0.3 cm thick 1.5% enriched
uranium. The cladding is 0.25 mm 304 stainless steel. The coolant
saturation temperature is 260
neutrons/cm^{14} /s. The surface
temperature of the clad is 350 ^{2}C.^{o}Assume any missing data to answer the following questions:. 1) Write an expression of the heat generated per unit volume 2 What is the heat flux at the surface of the fuel? 3) What is the temperature at the fuel-clad interface? 4) What is the maximum fuel temperature, and where? 5) What is the minimum fuel temperature, and where? 6) How much heat (in joules) is transported to the coolant in one second and one hour? [Please submit the answer using text so I can just copy and paste it, thank you]
b. write the initial condition of the problem c, write the boundary conditions for the cooling process of the ball.
. The radius of the sphere is
^{3}R = 1.5 cm. Heat is
dissipated to the surrounding medium at 25
_{o}C with a heat transfer coefficient of
120 W/m^{o} K. Calculate the surface
temperature of the material and the total rate of heat dissipated
to the surrounding. Assume 1D steady state operation.^{2}[Please submit the answer using text so I can just copy and paste it, thank you] |

Answer #1

A nuclear fuel element consists of a solid cylindrical pin of
radius, r1 and thermal conductivity, kf. The fuel pin is in good
contact with a cladding material of radius, r2 and thermal
conductivity, kc. Consider steady state condition for which uniform
heat generation occurs within the fuel at a volumetric rate, g
(w/m3 ) and the outer surface of the cladding is exposed to a
coolant that is characterized by temperature, Tsur and convection
coefficient, h.
a) Obtain equations...

Q. Unsteady conduction
A large steel plate 0.02 m thick leaves a heat treating furnace
at 425 oC. And the plate is
plunged into water (at 25 oC) and cooled from both sides. How
long does it take for the
maximum temperature to reach 65 oC?
For steel plate: thermal conductivity, k=30 W/m·K, density
?=7600 kg/m3, heat capacity
cp=700 J/kg·K. Heat transfer coefficients: h=6000 W/m2·K in
water.
Please use two methods to calculate this question:
(1) Directly apply the exact...

71 mm thick horizontal plate made of an opaque material of
thermal conductivity k= 25 W/m-K. At the bottom, water flows at a
temperature of T∞,w = 25C, whereas air flows at the top of the
plate at T∞,a = 710 C having convection coefficient of ha= 71
W/m2-K. Assuming a diffused top of the plate that receives an
irradiated flux of 7100W/m2, of which 30% is reflected back. The
top and bottom surface temperatures are maintained at 43 C...

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