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页数:7页
时间:2019-02-27
《添加剂对libr溶液吸收蒸汽过程中的强化机理》由会员上传分享,免费在线阅读,更多相关内容在工程资料-天天文库。
1、第17卷第2期化学物理学报Vol.17,No.22004年4月CHINESEJOURNALOFCHEMICALPHYSICSApr.20041003-7713/2004/02-179-7*添加剂对LiBr溶液吸收蒸汽过程中的强化机理**程文龙,陈则韶(中国科学技术大学热科学和能源工程系,合肥230027)摘要:利用吊板法测量了加有正辛醇和异辛醇这两种添加剂的溴化锂溶液的表面张力,利用激光照相的可视化方法研究了在静池吸收过程中添加剂对溴化锂溶液吸收水蒸汽的强化影响.实验结果显示液体添加剂和蒸汽添加剂都能显著地降低溴化锂溶液的表面张力;蒸
2、汽添加剂不仅和液体添加剂一样可以在吸收表面引起马拉戈尼对流,而且对吸收具有更好的强化效果.根据对实验现象的分析,得出了添加剂对吸收的强化机理:由于溶液表面层对液体添加剂或蒸汽添加剂的表面吸附作用,造成吸收界面处表面张力分布不均匀,从而在吸收界面引起马拉戈尼对流现象,强化了吸收过程中的传热、传质性能.关键词:添加剂;溴化锂;吸收;传热传质+中图分类号:TK511.3文献标识码:AStudyonEnhancementMechanismofAdditiveon*theAbsorptionofWaterVaporbyAqueousLiBr**
3、ChengWenlong,ChenZeshao(DepartmentofThermalScience&EnergyEngineering,UniversityofScience&TechnologyofChina,Hefei230027)AbstractThesurfacetensionsofaqueouslithiumbromide(LiBr)withadditive(2-ethyl-1-hexanoland1-Octanol)havebeenmeasuredbyusingaWihelmyplatemethod,andtheenha
4、ncementeffectoftheadditivesontheabsorptionofsteamintoaqueousLiBrinastaticpoolhasbeenstudiedbyareal-timetypelaserholographicvisual-izationmethod.Theexperimentalresultsshowthatbothofliquidadditiveandvaporadditivecandecreasethesur-facetensionsofaqueousLiBrsignificantly,vap
5、oradditivenotonlycantriggertheMarangoniconvectionattheab-sorptioninterfacejustliketheliquidadditive,butcanbringaboutbetterenhancementeffectontheabsorptionper-formancethanthatliquidadditivecan.Theenhancementmechanismofadditiveonabsorptionhasbeenconcludedthatbothliquidadd
6、itiveandvaporadditivecanbeadsorbedbyaqueousLiBrattheliquid-vapor-interfacefromtheliquidsideandthevaporsiderespectively,whichresultinsurfacetensiongradient,andthencauseMarangonicon-vectionattheinterfacewhichenhancestheheatandmasstransferperformanceduringtheabsorptionproc
7、ess.KeywordsAdditive,LiBr,Absorption,Heatandmasstransfer辛醇(2EH)、正辛醇(1-Octanol)等添加剂可以大大1引言提高LiBr溶液在吸收水蒸气过程中的传热、传质性在溴化锂(LiBr)吸收式制冷机中添加少量如异能.目前已经认识到,添加剂对吸收的强化作用体现*ProjectsupportedbytheNationalNaturalFoundationofChina(50206020)andtheScientificResearchFoundationfortheReturne
8、dOverseasChineseScholars,UniversityofScience&TechnologyofChina.**Correspondingauthor,E-mail:wlcheng@ustc.edu.c
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