第56卷 第9期 2005年9月 化 工 学 报

Journal of Chemical Industry and Engineering (China) Vol 56 No 9

September 2005

研究论文

引入液固界面效应的滴状冷凝传热模型

兰 忠,马学虎,张 宇,周兴东,陈嘉宾

(大连理工大学化工学院精细化工国家重点实验室,化学工程研究所,辽宁大连116012)

摘要:针对液固界面相互作用对滴状冷凝传热的影响,以Rose滴状冷凝传热模型为基础,考虑接触角、脱落直径对冷凝传热的影响,对滴状冷凝过程中液滴空间序列上的构象,作时间序列上的重构,建立了包含液固界面效应的滴状冷凝传热模型.模型计算结果表明液固表面自由能差越大、接触角滞后越小则越有利于冷凝传热.为滴状冷凝文献数据间存在差异的原因提供了一个新的解释,即液固界面效应的影响.模型可计算得到在不同界面条件下的不同传热结果,模型计算结果与Rose实验值以及本文滴状冷凝传热实验较为吻合.关键词:滴状冷凝传热模型;接触角;脱落直径;液固界面效应中图分类号:TK124 文献标识码:A

文章编号:0438-1157(2005)09-1626-07

Dropwisecondensationheattransfermodelwithliquid-solid

surfacefreeenergydifferenceeffect

LANZhong,MAXuehu,ZHANGYu,ZHOUXingdong,CHENJiabin

(StateKeyLaboratoryofFineChemicals,InstituteofChemicalEngineering,

DalianUniversityofTechnology,Dalian116012,Liaoning,China)

Abstract:Dropwisecondensationheattransferperformancedependsonnotonlythecondensingconditions,butalsotheinterfacialinteractionbetweenliquidandsolid.Comparedtothewel-lestablishedRose smodel,anewmodelofdropwisecondensationheattransferwasproposedbyconsideringtheinterfacialinteractionbetweenliquidandsolid,andwasestablishedbyrebuildingthespaceconformationofdropdistributionintotimeconformation.Thesimulationresultsindicatedthatheattransfercoefficientincreasedwithincreasingsurfacefreeenergydifferenceanddecreasingcontactanglehysteresis.Alargercontactangleandthesmallerdeparturedropsizeresultedinhigherheattransfercoefficient.Differentinterfacialeffectsgaverisetodifferentheattransfercurves.Fortheidenticalsolid-liquid-vaporsystem,thesimulationresultsagreedwellwiththepresentexperimentaldataandthosereportedbyRose.Thedisagreementbetweenexperimentalresultsinliteraturemightbewellexplainedwiththeconceptofthepresentpaper.

Keywords:dropwisecondensationheattransfermodel;contactangle;departurediameter;interfacialinteraction

效率,马学虎等[1]研究认为,从膜状冷凝到滴状冷凝,其传热效率并不是一个突变过程,而是随液固表面自由能差作渐进变化,甚至同样在滴状冷凝区

Receiveddate:2004-08-10.

Correspondingauthor:Prof.MAXuehu.E-mail:xuehuma@dlut edu cn

Foundationitem:supportedbytheNationalNaturalScienceofCh(.

引 言

滴状冷凝传热较膜状冷凝传热具有较高的传热

2004-08-10收到初稿,2004-10-25收到修改稿.

联系人:马学虎.第一作者:兰忠(1975 ),男,博士研究生.

基金项目:国家自然科学基金项目(50376005,59906002).