Engineering, 01.11.2019 04:31 BigGirlsTheBest
Layers of 23-cm-thick meat slabs (k = 0.47 w/m·°c and α = 0.13*10-6 m2 /s) initially at a uniform temperature of 7°c are to be frozen by refrigerated air at -30°c flowing at a velocity of 1.4 m/s. the average heat transfer coefficient between the meat and the air is 20 w/m2 ·°c. assuming the size of the meat slabs to be large relative to their thickness, determine how long it will take for the center temperature of the slabs to drop to -18°c. also, determine the surface temperature of the meat slab at that time. (25 points)
Answers: 2
Engineering, 04.07.2019 18:20
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Agas mixture consists of 8 kmol of h2 and 2 kmol of n2. determine the mass of each gas and the apparent gas constant of the mixture.
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Ahe-xe mixture containing a 0.75 mole fraction of helium is used for cooling electronics in an avionics application. at a temperature of 300 k and atmospheric pressure, calculate the mass fraction of helium and the mass density, molar concentration and molecular weight of the mixture. if the cooling capacity is 10 l, what is the mass of the coolant?
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Engineering, 04.07.2019 18:20
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
Layers of 23-cm-thick meat slabs (k = 0.47 w/m·°c and α = 0.13*10-6 m2 /s) initially at a uniform te...
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