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Flow Regime Transitions in an Internal‐Loop Airlift Reactor
Author(s) -
Fu C.C.,
Fan L.S.,
Wu W.T.
Publication year - 2007
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/ceat.200700017
Subject(s) - lyapunov exponent , mechanics , chaotic , flow (mathematics) , correlation dimension , airlift , loop (graph theory) , physics , thermodynamics , control theory (sociology) , mathematics , chemistry , fractal dimension , bioreactor , mathematical analysis , control (management) , organic chemistry , management , combinatorics , artificial intelligence , computer science , fractal , economics
Abstract The flow regime transitions of the riser and downcomer in an internal‐loop airlift reactor are investigated. Analysis of the effects of mean value, standard deviation and chaotic time series on pressure fluctuation signals is recorded to determine the transition of the hydrodynamics in the riser and downcomer of the internal‐loop airlift reactor. Two major chaotic invariants, the correlation dimension and the largest Lyapunov exponent, are employed to indicate the regime transitions. The regime transitions are determined by the sudden increase and decrease of the chaotic invariants, which are computed by the pressure fluctuation signals obtained by varying the gas flow velocity. The determination of chaotic invariants predicts that there is no heterogeneous phase existing in the downcomer of the internal‐loop airlift reactor. The experimental observations agree well with the predicted results.