Determine the vapor concentration and partial pressure

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Reference no: EM131337777

An object of irregular shape 1 m long maintained at a constant temperature of 100°C is suspended in an airstream having a free stream temperature of 0°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°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°C, 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°C for the plastic material is 0.0323 atm. The mass diffusivity for the vapor in air at 50°C is 2.60 × 10^-5 m² /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/m² for the first object, determine the average mass flux n"A (kg/s· m²) for the second object.

Reference no: EM131337777

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