定常流場下波壁流路內(nèi)的流體流動及質(zhì)量傳遞特性.pdf

1、大連理工大學碩士學位論文定常流場下波壁流路內(nèi)的流體流動及質(zhì)量傳遞特性姓名：孫宇申請學位級別：碩士專業(yè)：流體力學指導教師：卞永寧20050624定常流場下波壁流路內(nèi)的流體流動及質(zhì)量傳遞特性FLuDFLOWANDMASSTRANSFERCHARACTERISTICSINAWAVY—WALLEDTUBEFORSTEADYFLOWAbstractW曲thedevelopmentofscienceandtechnologythehigheffic

2、iencyheatandmasstransferdeviceswithlOWpowerconsumptionarepaidattentionmoreandmoreFlowsintheperiodicallyconvergingdivergingchannelsornjbesarcpresentinnulIlerOUSapplicationsThefeatureofthesedevicesisthatbyutilizingtheunste

3、adyvortexmotiongeneratedfromtheforcedorselfsustainedoscillation，therequiredhigherheatandmasstransferratescaDbeattainedwithoutturbulentflowManyinvestigatorshavedevotedtheireffortstothestudiesonheatandmasstransferforflowin

4、theabovechannelsortubesHowevertheflowinstabilityandthetransportmechanismhavenotbeenclarifiedyetTheobjectiveofthedissertationiSonthebaseofpreviousinvestigators’results，bymean$ofexperimentandaccessorialnumericalsimulationt

5、ofredtheoptimumopemlingconditionsandtodescribethemechanismofflowinstabilitytooMaincontentsofthisdissertation8reasfollows：InChapterl，thepreviousstudiesonfluidflowandheatandmasstransfercharacteristicsintwodimensionalchanne

6、lsandaxisymmetrictubeshavebeenreviewednleScstudiesindicatethatforthetwodimensionalchannels，theflowinstabilJty，whichleadstotheflowtransitionfromlaminartoturbulentflow，istriggeredbyperiodicalTollmienSchlichlingwaveMoreover

7、，thestudiesshowedthattheoptimumtransportenhancementcouldbeobtainedatmediumReynoldsNumberinthetransitionalflowregime，themechanismofresonantenhancementcanbeusedtOexplainthisphenomenonBasedonthefactthattheintermiRentflowins

8、tability，suchaspuffandslug，OCCtlrsinthestraightwalledtubewiththecircularcrosssection，itisexpectedthattheflowinstabilityisdifferentbetweenthewavywalledtuboandthewavy—walledchannelChapter2in缸oducedtheexperimentalapparatusa

9、ndvariousmeaSurementtechniquesappliedtothecurrentstudynleflowpatternsarevisualizedmainlybythealuminumdustmethodanddyeinjectionmethodnlcstreamwisevelocityprofilesareobtainedbythenumericalsimulationinlaminarflowregimeMasst

10、ransferratesandwallshearstressesaremeasuredbytheelectrochemicalmethodChapter3describedtheexperimentalresultsFirst，accordingt0thepressuredropexperiment，theflowisdividedintothreeregimesElectrochemicalexperimentresuitsshowt