Journal ArticleDOI
Origin of pressure fluctuations in fluidized beds
M. Punčochář,J. Drahoš +1 more
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In this article, the authors proposed a physical model for the standard deviation of incoherent part of pressure fluctuations in a fluidized bed with respect to the spectral analysis based on several realistic assumptions for a freely bubbling bed.About:
This article is published in Chemical Engineering Science.The article was published on 2005-03-01. It has received 36 citations till now. The article focuses on the topics: Fluidized bed & Total pressure.read more
Citations
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Time-series analysis of pressure fluctuations in gas–solid fluidized beds – A review
J. Ruud van Ommen,Srdjan Sasic,John van der Schaaf,Stefan Gheorghiu,Filip Johnsson,Marc-Olivier Coppens +5 more
TL;DR: It is concluded that progress has been made in understanding fluidized-bed dynamics by extracting the relevant information from pressure fluctuation data, but the picture is still incomplete.
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A critical review of the complex pressure fluctuation phenomenon in gas–solids fluidized beds
TL;DR: In this article, the complex pressure fluctuation phenomenon in gas-solid fluidized beds is systematically examined based on a comprehensive review of the literature data, and it is shown that the local pressure fluctuations are composed of multiple sources, including local bubble induced fluctuations, global bed oscillations and propagating pressure waves originating in other locations (e.g. bed surface, distributor and windbox).
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Standard deviation of absolute and differential pressure fluctuations in fluidized beds of group B particles
TL;DR: In this article, the authors describe the behaviour of the standard deviation of pressure fluctuations in fluidized beds for group B particles in the bubbling regime and propose an empirical-theoretical function, which depends on the gas velocity.
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Local characterization of a gas–solid fluidized bed in the presence of thermally induced interparticle forces
Jaber Shabanian,Jamal Chaouki +1 more
TL;DR: In this article, the effect of interparticle forces (IPFs) on the local flow structure of a gas-solid fluidized bed was investigated with an accurate optical fiber probe at different temperatures and gas velocities covering both bubbling and turbulent fluidization regimes.
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Phase space structure and multi-resolution analysis of gas–solid fluidized bed hydrodynamics: Part I — The EMD approach
TL;DR: In this article, the Hilbert-Huang transform was applied to perform a multi-resolution analysis by means of the empirical mode decomposition, EMD, of noisy pressure signals collected from a gas-solid fluidized bed operating in slugging regime.
References
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Journal ArticleDOI
Non-intrusive determination of bubble and slug length scales in fluidized beds by decomposition of the power spectral density of pressure time series
van der J John Schaaf,van der J John Schaaf,JC Jaap Schouten,Filip Johnsson,van den Cm Bleek +4 more
TL;DR: In this paper, the authors show that spectral analysis of non-intrusive time dependent pressure measurements in bubbling and circulating gas-solid fluidized beds permits to obtain the first estimates of bubble, gas slug, and solids cluster length scales from pressure fluctuation data.
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Pressure fluctuations in a fluidized bed
TL;DR: In this paper, an online statistical study of the pressure fluctuations in fluidized beds was conducted by using pressure transducers, a correlation and probability analyzer and a Fourier transform analyzer.
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Experimental methods in fluidization research
J.G. Yates,S.J.R. Simons +1 more
TL;DR: The early use of immersed probes of various kinds is assessed critically and compared with more recently developed non-invasive techniques, such as tomographic imaging as discussed by the authors, and the complete velocity spectrum from bubbling through turbulent to fast operation is considered and main conclusions obtained regarding gas and particle dynamics are presented.
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Monitoring the quality of fluidization using the short-term predictability of pressure fluctuations
TL;DR: In this paper, an analysis method is proposed that uses the short-term predictability of time series of (local) pressure fluctuations in the fluidized bed to detect changes early in the hydrodynamic state of the bed.
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Evaluation of minimum fluidizing velocity in gas fluidized bed from pressure fluctuations
TL;DR: In this paper, a new experimental method for the evaluation of minimum fluidizing velocity in gas fluidized beds is proposed based on the pressure fluctuations measurements, which is determined solely from the measurements in the fluidized bed regime, unlike the traditional method where experiments in the fixed bed regime are also necessary.