Application of multiresolution analysis for simultaneous measurement of gas and liquid velocities and fractional gas hold-up in bubble column using LDA

A new strategy using wavelet transforms for multiresolution analysis of bubble column hydrodynamics from laser Doppler anemometer measurements of the axial velocity has been formulated. The advantage of the methodology is that we may infer intrinsic features of the bubble column hydrodynamics by acc...

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Bibliographic Details
Published in:Chemical engineering science 2001-09, Vol.56 (17), p.5037-5048
Main Authors: Kulkarni, Amol A., Joshi, Jyeshtharaj B., Kumar, V.Ravi, Kulkarni, Bhaskar D.
Format: Article
Language:English
Subjects:
Applied sciences
Bubble column
Chemical engineering
Exact sciences and technology
Gas hold-up
Hydrodynamics of contact apparatus
LDA
Multiresolution analysis
Noise reduction
Wavelet transforms
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Summary:A new strategy using wavelet transforms for multiresolution analysis of bubble column hydrodynamics from laser Doppler anemometer measurements of the axial velocity has been formulated. The advantage of the methodology is that we may infer intrinsic features of the bubble column hydrodynamics by accurately detecting the passage of bubbles at local positions in the column. The detection of bubbles was possible by denoising local time series data and analyzing for its intermittent behavior. The methodology allows for calculating the changes in the local average liquid velocities and local gas hold-up and was related to the intermittent nature of turbulence in the system. The variation in these properties and flow behavior as a function of radial distance have been studied.
ISSN:0009-2509
1873-4405
DOI:10.1016/S0009-2509(01)00191-9