Engineering, 02.04.2021 22:30 jdilla98
Pebble-bed nuclear reactor is a design for a graphite-moderated gas-cooled nuclear reactor. The basic fuel design features spherical fuel elements called pebbles. Consider the tennis ballshape fuel elements as a sphere with internal heat generation and constant properties. Heat is generated uniformly at a rate of S per volume. The ball has constant thermal conductivity k and radius R. The ball is exposed to a gas cooling media with a heat transfer coefficient of h. The temperature of the cooling gas media is T0. Find out the temperature distribution in the ball under steady state condition. (Hint: (1) temperature in the ball has to be finite; (2) surface cooling is controlled by convective heat transfer))
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Air flows over a heated plate àt a velocity of 50m/s. the local skin factor coefficient at a point on a plate is 0.004. estimate the local heat transfer coefficient at this point.the following property data for air are given: density = 0.88kg/m3 , viscosity 2.286 x 10 ^-5 kgm/s , k = 0.035w/mk ,cp = 1.001kj/kgk. use colburn reynolds analogy.
Answers: 1
Pebble-bed nuclear reactor is a design for a graphite-moderated gas-cooled nuclear reactor. The basi...
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