A fluidized bed dryer is used to dry particles with a density of 1100 kg/m3 (at moisture content of 0%) from 40% to 10% moisture content. The drying agent is hot air at 100 °C. Porosity of the particles in the stationary state is 0.35. The particle diameter is 2 mm. a. When calculating critical velocity of the hot air flow in the dryer, what value of particle density (containing 0%, 10% or 40% moisture content) is used and why? Given: the density of wet particles is calculated using the formula for a suspension. b. Calculate the critical velocity of the hot air flow to get fluidization state of the particles
A fluidized bed dryer is used to dry particles with a density of 1100 kg/m3 (at moisture content of 0%) from 40% to 10% moisture content. The drying agent is hot air at 100 °C. Porosity of the particles in the stationary state is 0.35. The particle diameter is 2 mm. a. When calculating critical velocity of the hot air flow in the dryer, what value of particle density (containing 0%, 10% or 40% moisture content) is used and why? Given: the density of wet particles is calculated using the formula for a suspension. b. Calculate the critical velocity of the hot air flow to get fluidization state of the particles
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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A fluidized bed dryer is used to dry particles with a
density of 1100 kg/m3 (at moisture content of 0%) from 40% to 10% moisture content. The drying agent is hot air at 100 °C. Porosity of the particles in the stationary state is 0.35. The particle diameter is 2 mm.
a. When calculating critical velocity of the hot air flow in the dryer, what value of particle density (containing 0%, 10% or 40% moisture content) is used and why? Given: the density of wet particles is calculated using the formula for a suspension.
b. Calculate the critical velocity of the hot air flow to get fluidization state of the particles
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