内翅板蒸发式冷凝器水膜流动特性.pdf

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1、化工进展2017年第36卷第6期CHEMICALINDUSTRYANDENGINEERINGPROGRESS·2017·内翅板蒸发式冷凝器水膜流动特性吴学红，陆刘记，刘旭，龚毅（郑州轻工业学院能源与动力工程学院，河南郑州450002）摘要：为了提高蒸发式冷凝器板外换热性能以及增强板外气液两相流动，设计了4种新型内翅板蒸发式冷凝器换热板片结构，实验测试不同喷淋密度下各换热板片上的水膜流动形态及喷淋密度对板片换热性能的影响。结果表明：水膜厚度随喷淋密度减小而减薄；喷淋密度较大时，受板片结构及气液剪切力影响，水膜流动向中心区域聚集，且部分区域会出现水膜飞溅现象；随着喷淋密度减小，水膜飞溅现象逐渐消

2、失，但在低喷淋密度时部分板片会有“干斑”现象。半圆波纹板片在喷淋密度分别为0.524kg/(m·s)、0.738kg/(m·s)、0.905kg/(m·s)时，换热性能均优于其他换热板片，且在此喷淋密度时，板片换热面积及水膜稳定时间是影响其换热性能的主要因素。本实验研究为内翅板蒸发冷凝器的工程应用和设计提供理论指导。关键词：气液两相流；蒸发；传热；水膜；喷淋密度中图分类号：TB657.5文献标志码：A文章编号：1000–6613（2017）06–2017–06DOI：10.16085/j.issn.1000-6613.2017.06.007Experimentalstudyonthewate

3、rfilmflowingcharacteristicsoftheinternalfin-plateevaporativecondenserWUXuehong，LULiuji，LIUXu，GONGYi（SchoolofEnergyandPowerEngineering，ZhengzhouUniversityofLightIndustry，Zhengzhou450002，Henan，China）Abstract：Inordertoimproveheattransferperformanceoftheevaporativecondenserplateandenhancethegas-liquidt

4、wo-phaseflow，fourheat-exchangeplatesofinternalfin-plateevaporativecondenserweredeveloped.Thewaterfilmflowingformwithdifferentspraydensitiesandtheinfluenceofspraydensityonheattransferofheat-exchangeplatewereinvestigated.Theresultsshowedthatthethicknessofwaterfilmthinnedwiththedecreaseofthespraydensi

5、ty.Affectedbytheplatetypeandgasfluidshearstress，waterfilmflowinggatheredtowardthecenterarea，andthesplashofwaterfilmappearedinlocalareawithlargerspraydensity.Withthedecreaseofspraydensity，thesplashofwaterfilmdisappeargradually.However，inthelowspraydensity，the“drysports”phenomenonhadproducedonthesome

6、internalfin-plate.Whenthespraydensitywere0.524kg/(m·s)，0.738kg/(m·s)，0.905kg/(m·s)，theperformanceofheattransferofsemicirclecorrugatedplatewassuperiortotheotherplates.Also，heat-exchangeareaofplateandstabletimeofwaterfilmwerethemainfactorsthataffectedheattransferperformanceunderthesespaydensities.The

7、experimentalresultsprovidethetheoreticalreferenceofengineeringapplicationanddesignofinternalfin-plateevaporativecondenser.Keywords：gas-liquidtwo-phaseflow；evaporation；heattransfer；waterfilm；spraydensity收稿日期