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Technical Briefs

Probabilistic Approach to Particle-Wall Contact Time in Fluidized Beds

[+] Author and Article Information
Reza Zarghami, Rahmat Sotudeh-Gharebagh

Process Design and Simulation Research Centre, Oil and Gas Centre of Excellence, School of Chemical Engineering, University of Tehran, P.O. Box 11155/4563, Tehran, Iran

Navid Mostoufi

Process Design and Simulation Research Centre, Oil and Gas Centre of Excellence, School of Chemical Engineering, University of Tehran, P.O. Box 11155/4563, Tehran, Iranmostoufi@ut.ac.ir

J. Heat Transfer 131(9), 094503 (Jun 24, 2009) (3 pages) doi:10.1115/1.3139112 History: Received August 31, 2008; Revised March 21, 2009; Published June 24, 2009

The heat transfer between submerged surface and particles in fluidized bed is affected by particle migration to and from the exchanger surface. A new probabilistic model was developed for particle migration and particle-wall contact time distribution based on a classical gamma function. The existing models suggest a decrease in contact time by increasing the gas velocity. However, it has been experimentally shown that the contact time increases in turbulent regime by increasing the gas velocity. A theoretical probabilistic model was developed to represent such a trend. The model is in good agreement with the experimental data.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

Grahic Jump Location
Figure 1

Status of marked (black, white) particles near surface element

Grahic Jump Location
Figure 2

Residence time distribution function of particle-wall contact time for sand particles at various gas velocities

Grahic Jump Location
Figure 3

The departure-rate function, sand particles, U0=0.9 m/s, θ=0.082, and β=1.2407

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