An object of irregular shape 1 m long maintained at a
Chapter 6, Problem 6.61(choose chapter or problem)
An object of irregular shape 1 m long maintained at a constant temperature of 100C is suspended in anairstream having a free stream temperature of 0C, a pres-sure of 1 atm, and a velocity of 120 m/s. The air tempera-ture measured at a point near the object in the airstream is 80C. A second object having the same shape is 2 mlong 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 50C, and the total pressure is 1 atm. Aplastic coating on the surface of the object is being driedby this process. The molecular weight of the vapor is 82,and the saturation pressure at 50C for the plastic materialis 0.0323 atm. The mass diffusivity for the vapor in air at50C is 2.60?10?5m2/s.(a) For the second object, at a location corresponding tothe point of measurement on the first object, deter-mine the vapor concentration and partial pressure.(b) If the average heat flux q?is 2000 W/m2for the firstobject, determine the average mass flux nA? (kg/s?m2)for the second object.
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