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Sizing equations for rotary dryer

It has been that rotary driers are most economically operated when the total number of transfer units (NTU) range from 1.5 to 2.0. ... The minimum velocity of air is set based on the particle size. Air flow rate of 100 lb/hr .ft3 is sufficient for 420 microns. Hence this will be used in application. ... Diameter of the dryer = [ e = 2.09 m

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