R417A在水平光滑管和內(nèi)螺紋管內(nèi)沸騰換熱的性能模擬.pdf

1、西安科技大學(xué)碩士學(xué)位論文R417A在水平光滑管和內(nèi)螺紋管內(nèi)沸騰換熱的性能模擬姓名：王躍勇申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：供熱、供燃?xì)?、通風(fēng)及空調(diào)工程指導(dǎo)教師：姬長(zhǎng)發(fā)@Subject:PerfmanceSimulationofBoilingHeatTransferofR417AinsideHizontalSmoothInternallyGroovedTubesSpecialty:HeatingVentilationAirConditioningE

2、ngineeringName:WangYueyong（Signature）Instruct:JiChangfa（Signature）ABSTRACTAsthecomplexityofmultiphaseflowlackofmicrounderstingquantitativedeionoftheinterfaceheattransferdynamicbehavimultiphaseflowboilingheattransferhasbe

3、comeanimptantissueonmultiphaseflowresearch.AsthealternativetoR22atpresenttherearesomedifferencesbetweenternarynonazeotropicrefrigerantR417AR22intheflowheattransferperfmancestudyofboilingheattransferonR417Aintheevapatcanp

4、rovidethetheeticalbasisfthedevelopmentofreplacementrefrigerantsthecrespondingevapatsinthefuture.ThisarticlehasconductedthenumericalsimulationtheeticalanalysisonboilingheattransferperfmanceoftherefrigerantR417Ainhizontalt

5、ubes.FirstlybasedonflowheattransfermechanismofgasliquidtwophaseflowintubesthecomputingmodelsofahizontalsmoothtubeaninternallygroovedtubewerebuiltusingFluentsoftwaremeshed.Theboundaryconditionsweresetturbulencemodelthemul

6、tiphaseflowmodelwereedthroughtheanalysisofthermodynamicsfluiddynamics.Secondlythroughsimulationobtainedthedistributionvariationlawofthetemperaturefieldvelocityheattransfercoefficientonflowboilingheattransferofrefrigerant

7、R417Aintubes.Bychangingtheboundaryconditionssimulatedtheinfluencelawsofthemassflowrateheatfluxevapatingtemperaturedrynessontheboilingheattransfer:Astheincreaseoftherefrigerantmassflowrateheattransferdensitytheheattransfe

8、rcoefficientincreasedsignificantlytheinfluenceofevapationtemperatureontheheattransfercoefficientwasnotveryobviouswiththeincreaseddrynessheattransfercoefficientfirstlyincreasestoamaximumwhenwallturneddryheattransfercoeffi