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dc.contributor.authorRautenbach, Christo
dc.contributor.authorMelaaen, Morten Christian
dc.contributor.authorHalvorsen, Britt
dc.contributor.authorMudde, Robert F.
dc.date.accessioned2013-03-16T11:35:14Z
dc.date.accessioned2017-04-19T12:52:29Z
dc.date.available2013-03-16T11:35:14Z
dc.date.available2017-04-19T12:52:29Z
dc.date.issued2011
dc.identifier.citationRautenbach, C., Mudde, R.F., Melaaen, M.C & Halvorsen, B.M. The influence of the experimental span of Time-resolved X-ray tomography on dynamic parameters in a fluidized bed. In: IFSA 2011. Industrial fluidization South Africa. The proceedings of a conference on fluidization held in Johannesburg, South Africa 16-17 november 2011. Johannesburg: South African Institute of Mining and Metallurgy, 2011. p. 193-202
dc.identifier.isbn978-1-920410-25-4
dc.identifier.issn1015-6690
dc.identifier.urihttp://hdl.handle.net/11250/2438536
dc.description.abstractFluidized beds have presented some problems to experimentalists in the past due to their opaque nature [1]. This problem has however been overcome by non-intrusive nor invasive measurement techniques. X-rays or Gamma rays can move through such systems where light (low energy radiation) cannot. Tomographic techniques can thus also be used with nuclear methods and is generally referred to as nuclear densitometry [1]. Using Time-resolved X-ray tomography on a fluidized bed is a state of the art technique. The first data of such a system has been presented by [1]. With this technique being novel, a thorough investigation of the measurement scenarios has not been performed thus far. The current study will focus on the influence of the experimental span on the average bubble velocity, bubble frequency and bubble volume. The influence of thresholding was investigated and the accuracy of the obtained results will be determined by existing empirical equations. In all of the experiments, glass particles were used with a particle size distribution of 79-149 μm. In the present study the bed was fluidized using a single central jet and a porous plate distributer. This experimental set-up was chosen to make the study of the dynamic parameters more reliable and to include the uncertainties associated with a freely bubbling bed. The measurement technique is briefly discussed and it is concluded that at least 45 s is required to obtained a reliable result for the bubble velocity in a freely bubbling bed while at least 25 s are required to obtain reliable results for the bubble volume and frequency.
dc.language.isoeng
dc.relation.ispartofRautenbach, C. An Experimental and Theoretical Study of Dense Fluidized Bed Fluid Dynamics. PhD Thesis, Telemark University College, 2012
dc.relation.ispartofhttp://hdl.handle.net/2282/1223
dc.subjectfluidization
dc.subjectx-ray tomography
dc.subjectexperimental-span
dc.subjectbubbles size
dc.subjectvelocity and frequency
dc.titleThe influence of the experimental span of Time-resolved X-ray tomography on dynamic parameters in a fluidized bed
dc.typeConference object
dc.typePeer reviewed
dc.description.versionPublished version
dc.rights.holder© Copyright The Authors. All rights reserved
dc.subject.nsi562
dc.subject.nsi610


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