基于RANS方法的磁流體管流MHD效應及傳熱數(shù)值模擬研究

基于RANS方法的磁流體管流MHD效應及傳熱數(shù)值模擬研究基于RANS方法的磁流體管流MHD效應及傳熱數(shù)值模擬研究

摘要：本文研究了磁流體管內(nèi)MHD效應及熱傳輸特性。采用RANS方法，建立磁流體管流動和熱傳輸?shù)臄?shù)學模型，采用有限體積法進行數(shù)值計算。研究結(jié)果表明，磁場對磁流體管內(nèi)流動和傳熱有顯著影響，可顯著降低流體阻力，提高流體傳熱性能。得到了磁場強度、流速、磁流體管半徑等參數(shù)對流動和傳熱的影響規(guī)律，并比較了不同磁場強度及磁流體管半徑下的磁流體管內(nèi)流動和傳熱特性。本研究為磁流體管的應用提供了理論基礎(chǔ)和數(shù)值模擬方法。

關(guān)鍵詞：磁流體管；MHD效應；傳熱；RANS方法；數(shù)值模擬。

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