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1、化工原理填空與選擇答案版（PrinciplesofchemicalengineeringfillinandchooseanswersEdition）Achoice(everyday,1points,10points)1.Thefluidflowsinarectangularpipewithaheightof3Mandaheightof2m,andtheequivalentdiameteroftherectangularpipeis(C).A.1.2m;B.0.6m;C.2.4m;D.4.8m.2,whenthefluidflowsinthecirculartube,ifthesqu
2、areoftheresistanceisentered,thentherelationshipbetweenthecoefficientoffrictionandtheReynoldsnumberReis(C).A.Reincreases,lambdaincreases,B.Reincreases,lambdadecreases,C.Reincreases,andlambdaincreasesalmostunchangedD.Reincreases,lambdafirstincreases,thendecreases3,thethinnerthelaminar,thecorrect
3、conclusionis(D).ThesmallerthevelocitygradientneartheA.wallis,thelowertheB.turbulenceis,andthesmallertheC.flowresistanceisD.flowresistanceisgreater4,inthepipeline,whentheorificeflowapertureandthethroatdiameterofVenturiflowmeteristhesame,thesameflowconditions,Venturiflowmeterorificeflowcoefficie
4、ntCVandtheorificeholeflowcoefficientC0size(D).A.,CV=,C0,B.,CV>,C0,C.,D.,CV<,C0,uncertainty5.Inahorizontalvariablepipe,thepipesectionAisconnectedwiththebigpipesectionBwithaUtubedifferentialgauge.Whenthefluidflowsthroughthepipesection,thedifferentialmeterreadstheRvalueresponse(A).Thepressurediff
5、erencebetweenA.AandBtwosectionisB.,AandBtwo.TheflowresistancebetweensectionsC.,A,Btwo,thedynamicheadchangebetweensections,thelocalresistanceofD.suddenlyenlargedorreduced6fluidflowthroughthetwoparallelpipelinesections1and2,twotubewerestagnantcondition.TwotubelengthL1=2L2,diameterd1=2d2,volumefl
6、owV1/V2(C)..A.,1/2,B.,1/4,C.,1/8,D.1/167,calculatethesuddenexpansionofthepipesystemandsuddenlyreducethelocalresistance,thespeedvalueshouldbetakenas(C).TheflowvelocityattheupstreamsectionofA.isB.,thevelocityatthedownstreamsectionisC.,theflowvelocityinthepipeisD.,andtheflowvelocityinthebigpipeis
7、8,theairinacertaindiameterofthetubeasasteadyflow,ifthemassflowofairremainunchanged,whenthetemperatureincreases,theRevaluewillbe(B).A.increasesB.,decreasesC.,andD.remainsuncertain9,thefollowingflowmeterdoesnotbelongtothrottlingflowmeteri
