Phase space structure and multi-resolution analysis of gas–solid fluidized bed hydrodynamics: Part I — The EMD approach

Briongos, Javier Villa; Aragón, José M.; Palancar, María C.

doi:10.1016/j.ces.2006.07.023

Cited by 34 publications

(39 citation statements)

References 53 publications

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“…The corresponding timescales were characterized by the averaged instantaneous frequency, w j . These components were identified according to the matching criteria between the predicted timescales for particle, bulk and local bubble dynamics measured by the characteristic frequencies f p , f bulk , f Lb , respectively, and the corresponding w j (Briongos et al, 2006a) (Fig. 3).…”

Section: Resultsmentioning

confidence: 99%

“…In this study, the methodology presented by Briongos et al (2006a) for computing the EMD as well as to resolve the local bubble, bulk and particle dynamics is followed.…”

Section: The Hilbert-huang Transform Methodsmentioning

confidence: 99%

“…In order to keep the overall bed dynamic information, the time series were filtered using a digital low-pass filter Chebyshev type 1 with a cutoff frequency of f c = 20 Hz. A diagram of the experimental setup used has been reported previously in Briongos et al (2006a).…”

Section: Pressure Fluctuation Measurementmentioning

confidence: 99%

“…In contrast, the local and adaptive properties of the Hilbert-Huang Transform Method (HHTM), (Huang et al, 1998) have been successfully used to resolve the local bubble, bulk and particle dynamic components carried in the signal (Briongos et al, 2006a). Those authors proposed, for instance, to use the dense phase dynamic component to estimate the bed expansion ratio and, therefore, the subsequent bed height and void fraction.…”

Section: Introductionmentioning

confidence: 97%

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Phase space structure and multi-resolution analysis of gas–solid fluidized bed hydrodynamics: Part II: Dynamic analysis

Briongos

Aragón

Palancar

2007

Chemical Engineering Science

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Section: Resultsmentioning

confidence: 99%

“…In this study, the methodology presented by Briongos et al (2006a) for computing the EMD as well as to resolve the local bubble, bulk and particle dynamics is followed.…”

Section: The Hilbert-huang Transform Methodsmentioning

confidence: 99%

Section: Pressure Fluctuation Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

See 2 more Smart Citations

Phase space structure and multi-resolution analysis of gas–solid fluidized bed hydrodynamics: Part II: Dynamic analysis

Briongos

Aragón

Palancar

2007

Chemical Engineering Science

Self Cite

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“…As early as 1995, Bakshi et al (1995) suggested that the intermittence of measured signal allowed characterization of the transition of the flow in the bubble column based on wavelet analysis. Multi-resolution analysis such as wavelet analysis also had been applied to extract more useful information, which can determine the flow transitions (Li, 2001;Ren et al, 2001;Ellis et al, 2003;Zhao and Yang, 2003;Briens and Ellis, 2005;Briongos et al, 2006;Wu et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Origin of pressure fluctuations in an internal-loop airlift reactor and its application in flow regime detection

Zhang

2009

Chemical Engineering Science

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Resolution of structure characteristics of AE signals in multiphase flow system—From data to information

Wang

Cao

et al. 2009

AIChE Journal

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This investigation was performed to study the underlying structure characteristics of acoustic emission (AE) signals, which could be helpful not only to understand a relatively complete picture of hydrodynamics in multiphase flow systems, but also to extract the most useful information from the original signals with respect to a particular measurement requirement. However, due to AE signals are made up of emission from many acoustic sources at different scales, the resolution of AE signals is often very complicated and appears to be relatively poorly researched. In this study, the structure characteristics of AE signals measured both in gas-solid fluidized bed and liquid-solid stirred tank were researched in detail by resorting to wavelet transform and rescaled range analysis. A general criterion was proposed to resolve AE signals into three physicalrelated characteristic scales, i.e., microscale, mesoscale, and macroscale. Multiscale resolution of AE signals implied that AE signals in microscale represented totally the dynamics of solid phase and could be applied to measure particle-related properties. Furthermore, based on the structure characteristics of AE signals, useful features related to particles motion were extracted to establish two new prediction models, one for on-line measurements of particle size distribution (PSD) and average particle size in gas-solid fluidized bed and the other for on-line measurement of the suspension height in liquid-solid stirred tank. The prediction results indicated that (1) measurements of PSD and average particle size using AE method showed a fairly good agreement with that using sieve method both for laboratory scale and plant scale fluidized beds, and (2) measurements of the suspension height using AE method showed a fairly good agreement with that using visual method. The results thus validated that the extracted features based on analyses of structure characteristics of AE signals were very useful for establishing effective on-line measurement models with respect to some particular applications.

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Phase space structure and multi-resolution analysis of gas–solid fluidized bed hydrodynamics: Part I — The EMD approach

Cited by 34 publications

References 53 publications

Phase space structure and multi-resolution analysis of gas–solid fluidized bed hydrodynamics: Part II: Dynamic analysis

Phase space structure and multi-resolution analysis of gas–solid fluidized bed hydrodynamics: Part II: Dynamic analysis

Origin of pressure fluctuations in an internal-loop airlift reactor and its application in flow regime detection

Resolution of structure characteristics of AE signals in multiphase flow system—From data to information

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