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he column is 4 m high and the mass of solids in the bed is held constant at 3,500 kg. The bed is fluidized using dry air at 700 K (density = 0.504 kg/m and viscosity = .33×10° Pa-s). Under these conditions, the superficial gas velocity is 0.2 m/s and the mean bubble size is 5 cm. ) Calculate the minimum fluidization velocity of the particles (bed voidage at incipient fluidization is 0.45), ) What is the bed height under the operating conditions listed above? ) What is the fraction of bubbles in the bed? ) What fraction of particles will be entrained in the gas?

he column is 4 m high and the mass of solids in the bed is held constant at 3,500 kg. The bed is fluidized using dry air at 700 K (density = 0.504 kg/m and viscosity = .33×10° Pa-s). Under these conditions, the superficial gas velocity is 0.2 m/s and the mean bubble size is 5 cm. ) Calculate the minimum fluidization velocity of the particles (bed voidage at incipient fluidization is 0.45), ) What is the bed height under the operating conditions listed above? ) What is the fraction of bubbles in the bed? ) What fraction of particles will be entrained in the gas?

Introduction to Chemical Engineering Thermodynamics
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 powder made of spherical particles having a density of 1,600 kg/m and the size distribution shown in the table below, is fed into a fluidized bed, 2.2 m in diameter. Size range (um) mass fraction in feed 40 - 60 0.25 60 - 80 0.45 80 - 100 0.30 The column is 4 m high and the mass of solids in the bed is held constant at 3,500 kg. The bed is fluidized using dry air at 700 K (density = 0.504 kg/m° and viscosity = 3.33x10° Pa - s). Under these conditions, the superficial gas velocity is 0.2 m/s and the mean bubble size is 5 cm. a) Calculate the minimum fluidization velocity of the particles (bed voidage at incipient fluidization is 0.45), b) What is the bed height under the operating conditions listed above? c) What is the fraction of bubbles in the bed? d) What fraction of particles will be entrained in the gas?
Transcribed Image Text:A powder made of spherical particles having a density of 1,600 kg/m and the size distribution shown in the table below, is fed into a fluidized bed, 2.2 m in diameter. Size range (um) mass fraction in feed 40 - 60 0.25 60 - 80 0.45 80 - 100 0.30 The column is 4 m high and the mass of solids in the bed is held constant at 3,500 kg. The bed is fluidized using dry air at 700 K (density = 0.504 kg/m° and viscosity = 3.33x10° Pa - s). Under these conditions, the superficial gas velocity is 0.2 m/s and the mean bubble size is 5 cm. a) Calculate the minimum fluidization velocity of the particles (bed voidage at incipient fluidization is 0.45), b) What is the bed height under the operating conditions listed above? c) What is the fraction of bubbles in the bed? d) What fraction of particles will be entrained in the gas?
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