水平微小通道內(nèi)CO-,2-沸騰換熱研究.pdf

1、東華大學(xué)碩士學(xué)位論文水平微小通道內(nèi)CO沸騰換熱研究姓名：馬富芹申請學(xué)位級別：碩士專業(yè)：供熱、供燃氣、通風(fēng)與空調(diào)工程指導(dǎo)教師：范曉偉20041201BOILINGHEATTRANSFEROFC02INAHORIZoNTALMINITUBEABSTRACTChlorinecontainingCFCandHCFCrefrigerantsusedincivilandmilitaryairconditionersarenowbeingphased

2、outduetotheirozonedepletingeffectThenaturalrefrigerantcarbondioxide(co，)hasbeenrevivedduetoitsgoodtherlrlalpropertiesandenvironmentfriendlyInrecentyears，thesomeresearchershavebeenstudyinganddevelopingtheairconditioning，r

3、efrigerationandheatpumpsystemsusedC02asworkingfluidTheevaporatoristhekeyequipmentofthesystemSincethermalpropertiesofC02aredifferenttOotherconventionalrefrigerants，thecompactminichannelheatexchangersareusuallychosenasthen

4、ewdevelopingevaporatorsButuptOnow，thepapersaboutC02boilingheattransferinminichannelareiustfew，andtheresultsCan’tconductdirectlyandeffectivelytodeveloporproducetheequipmentsThereforethedissertationpresentsanexperimentalin

5、vestigationandanalysisonflowboilingheattransfercharacteristicsofC02inahorizontalsmoothminitubeInthedissertationC02thermalpropertiesandtherelatedchartsaresystematicallydescribedfirstlyThemainparametersaffectedboilingheatt

6、ransferandpressuredrop，suchasworkingpressure，densityandviscosity，arecomparedwithotherrefrigerantstooInordertounderstandtheboilingheattransfermechanismintheminichannel，thefamiliartwophaseflowregimeandheattransferfeaturein

7、conventionaltubearepresentedandthentheyarecomparedwiththatinminichannelAlthoughtherearesomesimilarflowregimesinbothconventionalandminitubetheheattransfercharacteristicaredifferentduetOefrectofthegeometricparametersInorde

8、rtoinvestigateboilingheattransfercharacteristicsofC02inahorizontalsmoothminichannelwithlmminnerdiameterdeeply，AnewopenedtestrigiSdesignedandestablishedTheeffectsofmassflowrate，heatingflux，evaporatingtemperatureandvaporqu