Title of article
Flowregimeidentificationusingchaoticcharacteristicsoftwo-phaseflowOriginalResearchArticle
Author/Authors
JaeYoungLee، نويسنده , , NamSeokKim، نويسنده , , MamoruIshii، نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2008
Pages
13
From page
945
To page
957
Abstract
Chaoticnatureoftwo-phaseflowisinvestigatedforitsdependencyupontheflowregimebyconstructingthepseudophasespacewiththetimesequentialimpedancesignalsofthevoidfraction.Inordertoconstructthepseudophasespace,theautocorrelationfunction(ACF)andtheaveragemutualinformation(AMI)forthedelayedtime,andthefalsenearestneighborhood(FNN)forthedimensionsastheembeddingparameterswereemployedhere.Itwasfoundthatthedelayedtimeandembeddeddimensionarehighlydependentupontheflowregime.Tovisualizethetrajectoryofsignalsinthephasespace,adensitymapisproducedbytheprojectionofthetrajectoryintothetwo-dimensionalplanewhichiscorrespondentwiththetwo-dimensionalprobabilitydistributionfunctions(2D-PDF).Sincethedensitymapof2D-PDFshowedcleardistinctionofflowpatterns,wedevelopedamethodtoidentifyflowregimebyapplyingsimpleclassificationrulestothedensitymap.Theproposedmethodsuccessfullyidentifiestheflowregimesoftheexperimentaldataofimpedancesignalsforthevoidfractionproducedflowregimemapfortheverticalchannelwithdiameterof25.4and50.8mm.
Journal title
Nuclear Engineering and Design Eslah
Serial Year
2008
Journal title
Nuclear Engineering and Design Eslah
Record number
895057
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