A cold model study of raceway hysteresis

Sarkar, S., Gupta, G. S., Litster, J. D., Rudolph, V., White, E. T. and Choudhary, S. K. (2003) A cold model study of raceway hysteresis. Metallurgical And Materials Transactions B-process Metallurgy And Materials Processing Science, 34 2: 183-191. doi:10.1007/s11663-003-0005-1


Author Sarkar, S.
Gupta, G. S.
Litster, J. D.
Rudolph, V.
White, E. T.
Choudhary, S. K.
Title A cold model study of raceway hysteresis
Journal name Metallurgical And Materials Transactions B-process Metallurgy And Materials Processing Science   Check publisher's open access policy
ISSN 1073-5615
Publication date 2003-04
Sub-type Article (original research)
DOI 10.1007/s11663-003-0005-1
Volume 34
Issue 2
Start page 183
End page 191
Total pages 9
Place of publication Warrendale, Pa USA
Publisher Minerals Metals Materials Soc
Collection year 2003
Language eng
Subject C1
291301 Process Metallurgy
670801 Iron and steel (e.g. ingots, bars, rods, shapes and sections)
Abstract The effect of a gas flow field on the size of raceway has been studied experimentally using a two-dimensional (2-D) cold model. It is observed that as the blast velocity from the tuyere increases, raceway size increases, and when the blast velocity is decreased from its highest value, raceway size does not change much until the velocity reaches a critical velocity. Below the critical velocity, raceway size decreases with decreasing velocity but is always larger than that for the same velocity when the velocity increased. This phenomenon is called raceway hysteresis. Raceway hysteresis has been studied in the presence of different gas flow rates and different particle densities. Raceway hysteresis has been observed in all the experiments. The effect of liquid flow, with various superficial velocities, on raceway hysteresis has also been studied. A study of raceway size hysteresis shows that interparticle and particle-wall friction have a very large effect on raceway size. A hypothesis has been proposed to describe the hysteresis phenomenon in the packed beds. The relevance of hysteresis to blast furnace raceways has been discussed. Existing literature correlations for raceway size ignore the frictional effects. Therefore, their applicability to the ironmaking blast furnace is questionable.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Gas-fluidized Beds
Q-Index Code C1

 
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