Drying When Radiation, Conduction, and Convection Are Present. A material is granular and wet with water and is being dried in a layer 25.4 mm deep in a batch-tray dryer pan. The pan has a metal bottom having thermal conductivity of ku = 43.3 W/m-K and a thickness of 1.59 mm. The thermal conductivity of the solid is ks = 1.125 W/m-K. The air flows parallel to the top exposed surface and the bottom metal at a velocity of 3.05 m/s and a temperature of 60°C and humidity H = 0.010 kg H2O/kg dry solid. Direct radiation heat from steam pipes having a surface temperature of 104.4°C falls on the exposed top surface, whose emissivity is 0.94. Estimate the surface temperature and the drying rate for the constant-rate period.
Drying When Radiation, Conduction, and Convection Are Present. A material is granular and wet with water and is being dried in a layer 25.4 mm deep in a batch-tray dryer pan. The pan has a metal bottom having thermal conductivity of ku = 43.3 W/m-K and a thickness of 1.59 mm. The thermal conductivity of the solid is ks = 1.125 W/m-K. The air flows parallel to the top exposed surface and the bottom metal at a velocity of 3.05 m/s and a temperature of 60°C and humidity H = 0.010 kg H2O/kg dry solid. Direct radiation heat from steam pipes having a surface temperature of 104.4°C falls on the exposed top surface, whose emissivity is 0.94. Estimate the surface temperature and the drying rate for the constant-rate period.
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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Transcribed Image Text:1. Drying When Radiation, Conduction, and Convection Are Present. A material is granular and wet with
water and is being dried in a layer 25.4 mm deep in a batch-tray dryer pan. The pan has a metal
bottom having thermal conductivity of ku = 43.3 W/m:K and a thickness of 1.59 mm. The thermal
conductivity of the solid is ks = 1.125 W/mK. The air flows parallel to the top exposed surface and the
bottom metal at a velocity of 3.05 m/s and a temperature of 60°C and humidity H = 0.010 kg H2O/kg
dry solid. Direct radiation heat from steam pipes having a surface temperature of 104.4°C falls on the
exposed top surface, whose emissivity is 0.94. Estimate the surface temperature and the drying rate
for the constant-rate period.
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