In the first stage of a paper-drying process, a cylinderof
Chapter 7, Problem 7.138(choose chapter or problem)
In the first stage of a paper-drying process, a cylinderof diameter 0.15 m is covered by moisture- soakedpaper. The temperature of the paper is maintained at70C by embedded electrical heaters. Dry air at avelocity of 10 m/s and temperature of 20C flows overthe cylinder. (a) Calculate the required electrical power and theevaporation rate per unit length of the cylinder, q?and n?A, respectively.(b) Generate plots of q?and n?Aas a function of the dryair velocity for 5V20 m/s and for paper tem- peratures of 65, 70, and 75C ? .
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