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1、化工原理填空与选择答案版1,choice(1point,10points)Inarectangulartubewithalengthof3mor2m,thediameteroftherectangulartubeis(C).A.1.2m;B.0.6m;C.2.4m;D.4.8m.Whenthefluidflowsinacircular,straighttube,thefrictioncoefficientlambdaisassociatedwiththeReynoldsnumberRe(C)whenenteringtheresistancesquare.A.Reincr
2、eases,lambdaincreasesB.Reincreases,lambdadecreasesc.Reincreases,andlambdaincreasesbasicallythesameD.Reincreases,thelambdagoesupandthendecreasesThethinnerthelaminarlayer,thefollowingconclusioniscorrect(D).Thelowerthevelocitygradientofthenearwall,thelowertheflowofturbulenceD.Thegreaterthef
3、lowresistance4,inacertainline,whentheporediameteroforificeflowandthethroatareaofventurimeterphaseatthesametime,thesameflowconditions,theorificeflowcoefficientofventurimeterCVandthesizeoforificemeterC0orificeflowcoefficient(D).A.CV=C0B.C0C5,inthelevelofAvariablediameterpipe,inthesmalltube
4、crosssectionandfillsectionBconnectAUtubedifferentialpressuregauge,whenthefluidflowsthroughthesection,thedifferentialpressuremeterreadingRvalueresponse(A).A.thepressuredifferentialbetweenAandBtwosectionb.flowresistancebetweenAandBtwosectionc.AandBthedynamicheadchangesbetweenthetwosectiond
5、.suddenincreaseordecreaseoflocalresistance6fluidflowsthroughtwoparallellines,1and2,bothofwhicharestagflation.ThepipelengthL1=2L2,theinnerdiameterd1=2d2,thevolumeflowV1/V2is(C)..A.1/2B.1/4c.1/8d.1/16Thevelocityvalueshouldbe(C)whencalculatingthesuddenexpansionofthepipingsystemandthelocalre
6、sistanceofsuddenreduction.A.theflowvelocityinthedownstreamsectionofthesectionTheairisinasteadyflowintheinnerdiameterofthetube,andiftheairqualityfluxremainsthesame,whenthetemperaturerises,theRevaluewill(B).A.increaseb.reducec.changed.uncertaintyThefollowingflowmeterdoesnotbelongtothethrot
7、tlingflowmeter(A)A.TherotameterB.OrificeflowmeterC.VenturimeterTheflowmetershouldbe(A)whenmeasuringtheflowwiththerotorflowmeter.A.theverticalinstallation,flowtothebottom-upb.verticalinstallation,flowtothetop-downc.horizontalinstallation,flowwithconvenientoperationforthepr
