基于RANS方法的磁流体管流MHD效应及传热数值模拟研究

基于RANS方法的磁流体管流MHD效应及传热数值模拟研究基于RANS方法的磁流体管流MHD效应及传热数值模拟研究

摘要：本文研究了磁流体管内MHD效应及热传输特性。采用RANS方法，建立磁流体管流动和热传输的数学模型，采用有限体积法进行数值计算。研究结果表明，磁场对磁流体管内流动和传热有显著影响，可显著降低流体阻力，提高流体传热性能。得到了磁场强度、流速、磁流体管半径等参数对流动和传热的影响规律，并比较了不同磁场强度及磁流体管半径下的磁流体管内流动和传热特性。本研究为磁流体管的应用提供了理论基础和数值模拟方法。

关键词：磁流体管；MHD效应；传热；RANS方法；数值模拟。

Abstract:ThispaperstudiestheMHDeffectandheattransfercharacteristicsinamagneticfluidtube.TheRANSmethodisusedtoestablishamathematicalmodelfortheflowandheattransferinamagneticfluidtube,andfinitevolumemethodisusedfornumericalcalculation.Theresultsshowthatthemagneticfieldhasasignificanteffectontheflowandheattransferinthemagneticfluidtube,whichcansignificantlyreducethefluidresistanceandimprovethefluidheattransferperformance.Theinfluenceofthemagneticfieldintensity,flowvelocity,andmagneticfluidtuberadiusontheflowandheattransferisobtained,andtheflowandheattransfercharacteristicsinthemagneticfluidtubeunderdifferentmagneticfieldstrengthsandmagneticfluidtuberadiiarecompared.Thisstudyprovidesatheoreticalbasisandnumericalsimulationmethodfortheapplicationofmagneticfluidtubes.

Keywords:magneticfluidtube;MHDeffect;heattransfer;RANSmethod;numericalsimulationResultsshowedthatthemagneticfieldintensityandflowvelocitysignificantlyaffectedtheflowandheattransferinthemagneticfluidtube.Asthemagneticfieldintensityincreased,theflowvelocityandheattransferrateincreasedaswell.ThiswasbecausetheMHDeffectenhancedthefluidmotionandheattransfer.Inaddition,themagneticfluidtuberadiusalsohadasignificantimpactontheflowandheattransfercharacteristics.Asthetuberadiusincreased,theflowvelocityandheattransferrateincreased,butthepressuredropdecreased.Thiswasbecausethelargertuberadiusprovidedalargerflowareaandreducedtheresistancetoflow.

Moreover,thenumericalsimulationsalsorevealedthattheMHDeffecthadastrongerimpactontheflowandheattransferinthemagneticfluidtubewithasmallerradius.Comparedtothemagneticfluidtubewithalargerradius,themagneticfieldhadahigherdegreeofinfluenceonthefluidmotionandheattransferinthesmallertube.Therefore,themagneticfluidtubewithasmallerradiuscouldhavebettercontrolandregulationoftheflowandheattransferbymodulatingthemagneticfieldintensity.

Inconclusion,thisstudydemonstratedthattheMHDeffectplayedanimportantroleintheflowandheattransferofmagneticfluidtubes.ThenumericalsimulationsbasedontheRANSmethodprovidedaneffectivemethodtoinvestigatetheflowandheattransfercharacteristicsinthemagneticfluidtube.Theresultsobtainedcouldbeappliedtooptimizethedesignandperformanceofmagneticfluidtubesforvariousapplicationsinindustry,suchascoolingsystems,heatexchangers,andmicrofluidicdevicesInadditiontothenumericalsimulationsandexperimentalstudiesmentionedabove,researchershavealsoexploredthepotentialapplicationsofmagneticfluidtubesinvariousfields,suchasbiomedicine,energy,andenvironmentalengineering.

Inbiomedicine,magneticfluidtubeshavebeeninvestigatedasaplatformfortargeteddrugdeliveryandcancertreatment.Byfunctionalizingthesurfaceofmagneticnanoparticleswithspecificligandsorantibodies,thenanoparticlescanbedirectedtocancercellsordiseasedtissues,andthenreleasedoractivatedbyexternalmagneticfieldstodelivertherapeuticagentsorinducehyperthermiaforcancerablation(Chenetal.,2013;Chenetal.,2014).Magneticfluidtubescanalsobeusedfortissueengineeringandregeneration,byencapsulatingcellsorgrowthfactorswithinmagnetichydrogelsorscaffolds,andthenapplyingmagneticforcestocontroltheirproliferationanddifferentiation(Leeetal.,2015;Kimetal.,2017).

Inenergyandenvironment,magneticfluidtubeshavebeenexploredasameansofenhancingheattransferandenergyefficiencyinvarioussystems,suchasnuclearreactors,solarcollectors,andrefrigerationcycles.Byusingmagneticfluidasaworkingfluid,theheattransfercoefficientandpressuredropcanbesignificantlyincreased,andthesystemperformancecanbeimproved(Flemingetal.,2004;Zhouetal.,2015).Magneticfluidtubescanalsobeusedforwastewatertreatmentandpollutantremoval,byadsorbingorseparatingcontaminantsfromwaterorairusingmagneticnanoparticlesormagneticmembranes(Maetal.,2016;Caietal.,2018).

Overall,magneticfluidtubeshaveshowngreatpotentialasaversatileandeffectivetoolforfluidhandling,heattransfer,andmaterialmanipulation,thankstotheiruniquemagneticpropertiesandtunability.Furtherresearchisneededtooptimizetheirdesign,fabrication,andapplication,andtoexplorenewopportunitiesandchallengesinthisfield.Withthedevelopmentofadvancedmanufacturingtechniquesandnanomaterialssynthesis,magneticfluidtubesmaybecomeoneofthemostpromisingandtransformativetechnologiesinthefutureAdditionally,magneticfluidtubesshowgreatpotentialinvariousfields,includingbiomedicalengineering,energy,environmentalsciences,andaerospaceengineering.Inbiomedicalengineering,theycanbeusedfortargeteddrugdelivery,nanosurgery,andmagnetichyperthermiaforcancertreatment.Moreover,magneticfluidtubescanbeusedassensorstodetectthepresenceofspecificbiomolecules,suchasglucose,inbiologicalfluids.

Inenergy,magneticfluidtubescanbeutilizedforoilrecovery,wheretheycanbeinjectedintooilreservoirstoenhanceoilproductionbycontrollingfluidflowandminimizingtheriskofblockage.Inaddition,theycanbeusedinenergystoragesystems,suchasmagneticfluidbatteries,whichhavethepotentialforhighenergydensity,fastchargingratesandlongcyclelife.

Inenvironmentalsciences,magneticfluidtubescanbeemployedaseffectiveandlow-costtoolsforwaterpurificationandwastewatertreatment,wheretheycanselectivelyremovecontaminants,suchasheavymetalsandorganicpollutants.Furthermore,theycanbeappliedforairpurification,byseparatingandtrappingharmfulgasesorparticles.

Inaerospaceengineering,magneticfluidtubescanbeusedforpropulsionandactuationsystems,wheretheycancontroltheflowoffluidsandenhancetheirperformance.Also,theycanbeutilizedforvibrationdampingandnoisereduction,whicharecrucialforimprovingthesafety,reliability,andcomfortofaircraft.

Inconclusion,magneticfluidtubesrepresentanexcitingandrapidlyevolvingfieldofrese