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Characterization of Gas Spouted Beds Using the Rescaled Range Analysis
Author(s) -
Xu Jian,
Bao Xiaojun,
Wei Weisheng,
Shen Shikong,
Bi H. T.,
Grace J. R.,
Lim C. J.
Publication year - 2004
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450820106
Subject(s) - hurst exponent , differential pressure , rescaled range , mechanics , flow (mathematics) , range (aeronautics) , materials science , thermodynamics , mathematics , detrended fluctuation analysis , physics , statistics , scaling , geometry , composite material
Abstract Differential pressure fluctuation measurements were conducted in a gas spouted bed of 120 mm in diameter at different axial and radial positions. Hurst's rescaled range analysis of the differential pressure fluctuation signals was successfully employed to recognize different flow regimes, i.e. packed bed, stable spouting and unstable spouting, and characterize their transitions. Obvious two‐phase behaviour, as suggested by two Hurst exponents, was observed in the stable spouting regime. It had also been found that the spouting behaviour in deeper spouted beds was significantly different from that in shallow spouted beds. The influences of measurement location and bed height on the Hurst exponents were discussed.