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RESEARCH PAPERS: SPECIAL ISSUE ON BOILING AND INTERFACIAL PHENOMENA: Heat Exchangers

Studies on Gas-Solid Heat Transfer in Cyclone Heat Exchanger

[+] Author and Article Information
A. Jain

Department of Applied Mechanics, M.N.R. Engineering College, Allahabad, India-211004

B. Mohanty

Department of Chemical Engineering, Indian Institute of Technology, Roorkee, India-247667

B. Pitchumani

Department of Chemical Engineering, Indian Institute of Technology, Delhi, India-110016

K. S. Rajan

School of Chemical and Biotechnology, Shanmugha Arts, Science, Technology and Research Academy, Thanjavur, India-613402rajan_sekar@yahoo.com

J. Heat Transfer 128(8), 761-768 (Jan 05, 2006) (8 pages) doi:10.1115/1.2217748 History: Received December 15, 2004; Revised January 05, 2006

Cyclones can be used for heating solid particles where the direct contact with the gas is permitted. Since cyclones have potential applications as heat exchangers in fertilizer, polymer powder, pharmaceutical and other industries, study of cyclone as heat exchanger is deemed important. Experiments on air-solid heat transfer were carried out in a cyclone heat exchanger of 100mm inside diameter, using sand. The effects of solid feed rate (0.57.5gs), cyclone inlet air velocity (922ms), and four average particle sizes (163460μm) on the heat transfer rate, exit solid temperature, and heat transfer coefficient have been studied. An empirical correlation has been proposed for the prediction of heat transfer coefficients based on the present experimental data. The proposed correlation predicts the heat transfer coefficients with an error of +10%to15% for the present data and within an error of +25%to15% for the data of other investigators.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Schematic diagram of the experimental setup

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Figure 2

Sketch of cyclone with dimensions (mm)

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Figure 3

Effect of solid feed rate on heat transfer rate at different inlet air velocities for average particle’s size of 359μm

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Figure 4

Effect of solid feed rate on solid exit temperature at different inlet air velocities for average particle’s size of 359μm

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Figure 5

Effect of solid feed rate on heat transfer coefficient for average particle’s size of 359μm at different air inlet velocities

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Figure 6

Effect of average particle size on heat transfer rate at different solid feed rates for air inlet velocity of 9.5m∕s

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Figure 7

Effect of average particle size on exit solid temperature at different solid feed rates for air inlet velocity of 9.5m∕s

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Figure 8

Effect of particle size on heat transfer coefficient at different solid feed rates for air inlet velocity of 9.5m∕s

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Figure 9

Comparison between heat transfer coefficients predicted using Eq. 17 and experimental heat transfer coefficients

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