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Minimum Fluidization Velocity At High Temperatures Based on Geldart Powder Classification
Author(s) -
Sangeetha V.,
Swathy R.,
Narayanamurthy N.,
Lakshmanan C. M.,
Miranda L. R.
Publication year - 2000
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/1521-4125(200008)23:8<713::aid-ceat713>3.0.co;2-x
Subject(s) - fluidization , magnetite , materials science , quartz , mineralogy , thermodynamics , pellets , fluidized bed , mathematics , chemistry , physics , composite material , metallurgy
The minimum fluidization velocities of sand, ilmenite, limestone and quartz magnetite were determined at temperatures ranging from 373–973 K. A best fit of the Wen and Yu type of equation was obtained for the experimental data. This correlation was extended to all experimental data obtained by various workers at high temperatures and was also compared with the existing correlations. However, a very high error percentage was obtained (> 50 %). The Geldart Powder Classification was made use of in classifying all materials used by different workers, as A, B and D, based on the material properties i.e., density and particle size. According to Geldart, C type powders are highly cohesive and hence cannot be subject to normal fluidization. Separate correlations were fitted for A, B and D type powders. Fitting separate correlations reduced the error by a considerable amount. Thus, the usage of separate correlations to predict the minimum fluidization velocity for A, B and D type powders was substantiated.