Engineering, 10.04.2020 22:57, Nyasiabaltimore3
Forced air at 25C and 10m/s is used to cool chips on a circuit board. Consider a chip, 4mm x 4mm, located 120mm from the leading edge of the board. An empirical correlation has been established for the local Nusselt number:
Nu_x = 0.04 * Re_x^0.85 * Pr^(1/3)
Estimate the surface temperature of the chip if it is dissipating 30mW.
(Thermophysical properties of air at 25C are needed to solve this problem. Please state your reference source for this information.)
Answers: 3
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Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented
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Engineering, 04.07.2019 18:20, RiverH246
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.
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Forced air at 25C and 10m/s is used to cool chips on a circuit board. Consider a chip, 4mm x 4mm, lo...
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