Marshall and Hougen present experimental data for the through-circulation drying of 5/16-inch extrusions of ZnO in a bed of 1 ft2 cross section by 1-inch high, using air of Td = 158oF and Tw =100oF at a flow rate of 340 ft3/min. The data show a constantrate period from Xo=33% to Xc=13%, with a drying rate of 1.42 lb H2O/h-lb bone-dry solid, followed by a falling-rate period that approximates Case 1 in Figure. Calculate the drying time for the constant-rate period and the additional time in the falling-rate period to reach a free-moisture content, X, of 1%. Free-moisture contentDrying rate

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Answered: Free-moisture content Drying rate

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Marshall and Hougen present experimental data for the through-circulation drying of 5/16-inch extrusions of ZnO in a bed of 1 ft² cross section by 1-inch high, using air of T_d = 158^oF and Tw =100^oF at a flow rate of 340 ft³/min. The data show a constantrate period from X_o=33% to X_c=13%, with a drying rate of 1.42 lb H₂O/h-lb bone-dry solid, followed by a falling-rate period that approximates Case 1 in Figure. Calculate the drying time for the constant-rate period and the additional time in the falling-rate period to reach a free-moisture content, X, of 1%.

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