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时间:2020-04-17
《错流型多级雾化旋转填料床传热性能的试验研究.pdf》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、第33卷第2期河南理工大学学报(自然科学版)VOl_33NO.22014年4月JOURNALOFHENANP0LYTECHNICUNIVERSITY(NATURALSCIENCE)Apr.2013错流型多级雾化旋转填料床传热性能的试验研究陈海辉,曾莹莹(1.井冈山大学化学化工学院,江西吉安343009;2.井冈山大学机电学院,江西吉安343009)摘要:采用空气冷却热水方式,对错流型旋转填料床进行传热性能试验.试验结果表明,比表面积、体积传热系数、以湿度为基准的气相体积传质系数均与雾化次数有显著关系,二次雾化比一次雾化增加21%,三次雾化比二次雾化增加18%,而与液流量无关.传热系数、以湿度
2、为基准的气相体积传质系数不随雾化次数和液流量变化,基本上保持在0.52kW·m~·K~,0.122kg(m·sAH)~.从而揭示出错流型旋转填料床强化气液传热的机理是由于将液滴雾化,极大地增加了传热面积,而不是提高了传热系数和以湿度为基准的气相体积传质系数.错流型旋转填料床经过三级雾化后,体积传热系数可达98kW/(m·K),结构更紧凑.关键词:错流型;旋转填料床;多级雾化:气液传热中图分类号:TQ051.8文献标识码:A文章编号:1673—9787(2014)02—0182—05Experimentalresearchonheattransferofcross--lowmulti—-ato
3、mizationrotatingpackedbedCHENHai—Hui,ZENGYing.Ying(1.CollegeofChemistry&ChemicalEngineering,JingGangSshanUniversity,ji"an343009,Jiangxi,China;2.CollegeofMechanical&ElectricEngineering,JingGangShanUniversity,Ji"an343009,Jiangxi,China)Abstract:Theheattransferfeature0±across—flowmulti—atomizationrotat
4、ingpackedbedisstudiedbythemodeofair—coolinghotwater.Thesuctionpressureofanaxialgasfanisabout120Pa,whererotatingspeedisabout1400r/min.Theexperimentsshowthatthespecificsurfaceareapervolumeandthevolumetricheat—transfercoeficientaftertwotimesatomizationareincreased21%thanonetimeatomization.decreased18%
5、thanthreetimesatomization,respectively.Thesearesignificantlyvariedwiththeatomizationtimes,andtheyareinde·pendentoftheliquidflow.Theheattransfercoeficientandgasvolumetricmasstransfercoefficientbasedonhumidityarenotvariedwiththeatomizationtimesandtheliquidflowchange,remainingsubstantially0.52kW·m一·K一
6、and0.122kg(m·sAH)一respectively.Theresultsrevealthatthemechanismoftheen—haneeofagas--liquidheattransferinthecross·-flowrotatingpackedbedisduetothedropletatomizationthatgreatlyincreasestheheattransferarea,ratherthantheheattransfercoeficientandgasvolumetricmasstrans—fercoeficientbasedonhumidity.Aftert
7、hreetimesatomization,thevolumetricheattransfercoefficientofthiscross—flowrotatingpackedbedcouldreachupto98kW/mK,keepingthebedmorecompact.Keywords:cross—flow;rotatingpackedbed;multi—atomization;gas—liquidhea
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