鼓泡流化床流動特性的直接數值模擬.pdf

1、浙江大學碩士學位論文鼓泡流化床流動特性的直接數值模擬姓名：吳錦坤申請學位級別：碩士專業(yè)：工程熱物理指導教師：樊建人20060201浙江大學碩士學位論文AbstractFluidizedbedsarewidelyusedinchemical，petroleum，energymaterial，environmentandotherindustrysegments11lemareadvantageofnuidizedbedsiSthatthe

2、motionofsolidsincreasestheheattransferratetothewalls，andthetemperatureinfluidizedbedCanbecontrolledeasilyBesidesit’Sconvenienttoaddanduploadthereactormaterialandthed囂ciencyoffluidizedbedreactorisgreatNowadays，agreatdealo

3、fexperimentsandtheorystudieshavebeencarried0utallovertheworldWhilethehydrodynamieofsolidparticleflnidizationiscomplicateatpresentit’SimpossibletoclarifythemechanismofallphenomenainfluidizedbedhltllisthesisEularLagrangian

4、methodiSperformedtoinvestigatethebubblingnuidizedbedthecollisionofparticlesiS“simulatedwithsoftspheremodeldevelopedbyTsujieta1nlerelationshipsbetweenbedpressurelOSSandthebedbottomairveloeitya∞figuredoutcalculatedresultsa

5、refairlyingoodagreementwithformerlyexperimentdataStatisticaldispersingcharacteristicsofbothairandparticlemeanvelocityhavebeenanalyzedParticlemotionaroundthebubbleisresearchedandthemovingtrackscausedbybubblemotionareobtai

6、nedJParticlemovementinthebubbleeruptionareaisanalyzedtoo，theresultsshowthatparticlesatthetoPofbubblereachhigherpositionthantheparticlesintheweakofthebubbledoafterthebubbleeruptionhappensThenthedistributionofthevoidfiacti

7、onwasresearchedSecondlyfluidizedbedwithbinaryandthirdmixtureofparticleswithvariousdiametersanddensitiesareinvestigated，theresultshowthatmixtureofvariousparticlesenhancethestrengthofparticlesturbulenceBesides，thedistribut

8、ionsofdifrerentparticlesinfluidizedbedareresearchedFinallythetalculationofpattielemotionwasextendedtothreedimensionsItisobservedthattheparticleturbulenceincreasedwhiletakeintoaccountthecollisionwiththefrontandreal“wallsK