A drying oven consists of a long semicircular duct of diameter D = 1 m as shown in Fig. P18.40.
Materials to be dried cover the base of the oven, while the wall is maintained at 1200 K. What is the drying rate per unit length of the oven (kg/s m) if a water-coated layer of material is maintained at 325 K during the drying process? Blackbody behavior may be assumed for the water surface and for the oven wall.