Experimental data for through-circulation drying of 1/4-inchdiameter spherical pellets of a nonhygroscopic carburizing compound exhibit constant-rate drying of 1.9 lb H2O/h-lb dry solid from Xo=30% to Xc=21%, followed by a falling-rate period to Xf=4% that fits R = aX + bX2 with a =3.23 and b = 27.7 (both in lb H2O/h-lb dry solid) for X as a fraction and R replaced by R' in lb H2O/h-lb dry solid. Calculate the time for drying in the falling-rate period. Note that the values of a and b satisfy the constraint of R'c =1.9 at Xc =0.21.

For the given drying process, the drying time for the rate in the falling rate curve is to be…

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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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Experimental data for through-circulation drying of 1/4-inchdiameter spherical pellets of a nonhygroscopic carburizing compound exhibit constant-rate drying of 1.9 lb H₂O/h-lb dry solid from X_o=30% to X_c=21%, followed by a falling-rate period to X_f=4% that fits R = aX + bX² with a =3.23 and b = 27.7 (both in lb H₂O/h-lb dry solid) for X as a fraction and R replaced by R' in lb H₂O/h-lb dry solid. Calculate the time for drying in the falling-rate period. Note that the values of a and b satisfy the constraint of R'_c =1.9 at X_c =0.21.

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