Engineering, 04.04.2020 14:15 SMURFETTE86
An object of irregular shape 1 m long maintained at a constant temperature of 100 degree C is suspended in an airstream having a free stream temperature of 0 degree C, a pressure of 1 atm, and a velocity of 120 m/s. The air temperature measured at a point near the object in the airstream is 80 degree C. A second object having the same shape is 2 m long and is suspended in an airstream in the same manner. The air free stream velocity is 60 m/s. Both the air and the object are at 50 degreeC, and the total pressure is 1 atm. A plastic coating on the surface of the object is being dried by this process. The molecular weight of the vapor is 82, and the saturation pressure at 50 degree C for the plastic material is 0.0323 atm. The mass diffusivity for the vapor in air at 50degree C is 2.60 x 10^-5 m^2/s.
a. For the second object, at a location corresponding to the point of measurement on the first object, determine the vapor concentration and partial pressure.
b. If the average heat flux q is 2000 W/m^2 for the first object, determine the average mass flux n A(kg/s*m^2) for the second object.
Answers: 1
Engineering, 04.07.2019 18:10, ashleybaber4966
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Engineering, 04.07.2019 18:10, lowkeyqueenk
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
Answers: 1
Engineering, 04.07.2019 18:10, nandalabella06
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Answers: 2
An object of irregular shape 1 m long maintained at a constant temperature of 100 degree C is suspen...
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