Question
Asked Dec 10, 2019
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13-47 A dryer is shaped like a long semicylindrical duct of diameter 2 m. The base of the dryer is occupied with water-soaked materials that are to be dried. The dome of the dryer has a constant
temperature of 500°C, while the materials at the base are at 40°C. Both surfaces can be approximated as blackbodies. Determine the length of the dryer so that the materials are dried at a rate of 0.1 kg/s.
FIGURE P13–47
Tz = 500°C
-----
-D= 2.0 m -
T = 40°C
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13-47 A dryer is shaped like a long semicylindrical duct of diameter 2 m. The base of the dryer is occupied with water-soaked materials that are to be dried. The dome of the dryer has a constant temperature of 500°C, while the materials at the base are at 40°C. Both surfaces can be approximated as blackbodies. Determine the length of the dryer so that the materials are dried at a rate of 0.1 kg/s. FIGURE P13–47 Tz = 500°C ----- -D= 2.0 m - T = 40°C

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The amount of heat leawing surface ® and xeaching swnface O the material · is sresposible tor drging Az Fai Tz"~T;" Qai =

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Fir =0 Fox surfaceo Fiz =I from Reciprocity theoxem , A, Fiz = Az fel AL Fn = Az AL (1) Fiz FRI Az AL Fai (a) Az Fel

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Heat sequired for vaporisetion. Quap - Co•) ( 22564 KT/19) - 225-64 KJIS 225640 Ile.

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