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.

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An object of irregular shape 1 m long maintained at a constant temperature of 100 degree C is suspen...

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