空气洗手装置

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1、空气洗手装置　　AgroupofseniorstudentsfromZhejiangUniversityhavesuccessfullydevelopedan“airhand-washingdevice.”Thedeviceutilizesaninfraredrayinductionsystem，whichdetectsthepresenceofhands.Atapthenspraysalightwatermistalongwithastronggustofair，whichthestudentshaveproventobenearlyaseffectiveastr

2、aditionalhand-washing.However，thedeviceusesonly10percentofthewaterthatregularhand-washingdoes.　　LiQizhang，amemberoftheteamthatdevelopedthedevice，toldareporterthatamodeloftheirdevicehasalreadybeeninstalledinaclassroombuildingattheuniversity，andthattheresultshavebeensatisfactory.Thestude

3、ntshavesetupacompanytofurtherpromotetheirproduct.　　In2014，astudentnamedChenPuyangfirstcameupwiththeideawhilewashinghishandsintheschoolcafeteria.Washinghandsusesalotofwater，Chenthought.Woulditbepossibletoreplacethewaterwithair？　　Othersmaynothavegiventhequestionasecondthought.However，for

4、ChenandLi，whowerestudyingFluidMechanics，thisconstitutedabrilliantidea。　　Soon，Chen，Liandseveralclassmatesembarkedontheproject.Thedesignofthedevicerequiredknowledgefromavarietyofdifferentmajors，sotheR&Dteameventuallycametobecomposedofsevenstudentsfromvariousmajors.　　“Weputdifferentkindso

5、fdirtonourhandsandwashedthemwithwater.Itturnedoutthat95percentofwaterisusedtoflushawaythedirt；only5percentisusedtodissolveit.Ifwewashedwithonlyair，thenthedirtonourhandswouldnotdissolve.Sowedecidedtouseafinewaterspraytocomplementtheair.Thatway，thedirtiscarriedawaybyairanddissolvedbywate

6、r，”explainedLi.　　Afterayearofresearchandexperimentation，theteamcameupwithagravity-drivenhand-washingdevicewhoserelianceonwaterwasminimal.Theuserstandsonaplatforminfrontofthedevice，whichsinksbecauseoftheweightoftheuser.Thegravityexertedbytheuserpullsthepistonthroughapulleyblock，andagust

7、ofairisgeneratedthroughairextrusion.Thetapthenreleasesawatermistcoupledwiththegust.　　Theteamtestedthedevicebyconductingchromogenicreactionandresidualbacteriaexperiments，whichprovedthattheresultsofhand-washingwithaircanbesimilartothoseofwashingwithwater.　　InSeptember2015，theteamtookit