Mathematical modeling for axial voidage distribution in CFB

Pages :

6 pages

Format :

.doc

Published date :

05/22/2009

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Summary :

 
 

Table of Contents Mathematical modeling for axial voidage distribution in CFB Table of Contents

 
  1. Introduction
  2. The random particle motion phenomena
  3. The nature of the clusters
  4. Calculation of entrainment flux
  5. Calculation of down ward flux at different heights of the CFB

Abstract

Kwauk proposed that the characteristic fine particle distribution in fast fluidization could not be accounted for by the one-dimensional analysis on accelerative motion of particulate fluidization, and presented a physical model for a gas-solid fast fluidization system. The average solid concentration is composed of both the strands and dilute continuum. Besides, he explained that characteristically the curve extends from a low voidage at the bottom.

The random particle motion phenomena in a fluidized bed is similar to the ecological diffusion process in which motion is from high particle concentration to lower concentration. Combining Brownian movement model and random walk theory with particle motion in a fast-fluidized bed.

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