Title of article
Wavelettime–frequencyanalysisofacceleratinganddeceleratingflowsinatubebankOriginalResearchArticle
Author/Authors
M.L.S.Indrusiak، نويسنده , , J.V.Goulart، نويسنده , , C.R.Olinto، نويسنده , , S.V.M?ller، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2005
Pages
13
From page
1875
To page
1887
Abstract
Inthepresentwork,thesteadyapproximationforacceleratinganddeceleratingflowsthroughtubebanksisdiscussed.Withthispurpose,theexperimentalstudyofvelocityandpressurefluctuationsoftransientturbulentcross-flowinatubebankwithsquarearrangementandapitch-to-diameterratioof1.26isperformed.TheReynoldsnumberatsteady-stateflow,computedwiththetubediameterandtheflowvelocityinthenarrowgapbetweenthetubes,is8×104.Airistheworkingfluid.Theacceleratinganddeceleratingtransientsareobtainedbymeansofstartandstopofthecentrifugalblower.Waveletandwaveletpacketmultiresolutionanalysiswereappliedtodecomposethesignalinfrequencyintervals,usingDaubechies20waveletandscalefunctions,thusallowingtheanalysisofphenomenainatime–frequencydomain.Thecontinuouswavelettransformwasalsoapplied,usingtheMorletfunction.Thesignalsinthesteadystate,whichpresentedabistablebehavior,wereseparatedintwomodesandanalyzedwithusualstatistictools.Theresultswerecomparedwiththesteady-stateassumption,demonstratingtheabilityofwaveletsforanalyzingtimevaryingsignals.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2005
Journal title
Nuclear Engineering and Design Eslah
Record number
895912
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