Fluid Dynamics智慧树知到期末考试答案章节答案2024年山东科技大学

FluidDynamics智慧树知到期末考试答案+章节答案2024年山东科技大学Inhorizontaldivergenttube,ignoringtheheadloss,thecorepressureinthesection,hasthefollowingrelationship:（）

答案:Theviscosityofliquidmainlycomesfromliquid（）

答案:intermolecularcohesion;Analysisfromtheviewpointofmechanics,generallythedifferencebetweenfluidandsolidis:（）

答案:fluidcan’tsustaintension,cannotbearshearstressinbalance;Therelationshipamongabsolutepressureandrelativepressure,vacuumpressure,andthelocalatmosphericpressureis（）

答案:Uniformflowis:（）

答案:mitigationaccelerationiszero;

答案:Circularflowislaminar,frictionforceisproportionaltopowerofaveragespeed（）.

答案:1;

答案:mechanicalenergyofthefluidinunitweight;ParameterthatisdirectlyrelatedtoNewton'slawsofinternalfrictionfactoris:（）

答案:shearstressandsheardeformationrate;Onedimensionalflowshallbelimitedtothecasethat:（）

答案:motionparameterswhichisafunctionofaspacecoordinatesandtimevariable;Variationoftotalheadalongthelineinviscousfluidis:（）

答案:alongthedeclinetrend;Thebaselineforrelativepressureis:（）

答案:thelocalatmosphericpressure;Staticpressuredistributioninthestaticflowfieldis（）

答案:applicableidealfluidandviscousfluid.Thecharacteristicsofidealfluidis:（）

答案:noviscosity;

答案:Allthetermsinatheoretical(dimensionallyhomogeneous)equationhavethesamedimensions,ifwedividethemallbyaquantitythathasthesamedimensionsthenallthetermswillbecomedimensionless.（）

答案:对Adimensionlessquantityrelatedtotheratiooftheinertiaforcestothepressureforcesisknownasthe.（）

答案:EulerNumberTheratioofthelineardimensionsoftheprototypeto,ordividedby,thecorrespondingdimensionsinthemodel.Itfollowsthatareasvaryas.（）

答案:Fortheratiooftheinertiaforcestoviscousforce,theresultingparameteriscalledthe.（）

答案:Reynoldnumber

答案:InReynoldexperiment,thecriterionthatdeterminesthewhethertheflowislaminarorturbulentis.（）

答案:ReynoldsnumberIfthesurfaceroughnessprojectionsarelargeenoughtoprotruderightthroughthetransitionlayer.Theresultingflowiscompletelyturbulent,knownasfullyrough(-pipe)flow（）

答案:对Inthestructureoftheturbulence,turbulentisinhibitedsothatalaminar-likesublayeroccursimmediatelynexttothewall.Thissublayeriscalled.（）

答案:viscoussublayer

答案:Themomentumprinciplestatesthatthesumoftheexternalforces

答案:对Themomentumprincipledealsonlywithforcesthatactonthefluidmassinadesignatedcontrolvolume(

答案:对Inthemomentumequation,forsteadyflowthenetforceonthefluidmassisequaltothenetrateofoutflowofmomentumacrossthecontrolsurface.（）

答案:对Themomentumcorrectionfactor(

答案:4/3Thevectorialmomentumequationcanbealsoexpressedasscalarequationsintermsofforcesandvelocitiesinthedirections,respectively.（）

答案:x,y,zTheheadlossinanideal(frictionless)incompressiblefluidisassumedas.（）

答案:-1ThevelocityheadinBernoulliequationcanbeexpressedas_______

inBernoulliequation.（）

答案:TheelevationheadinBernoulliequationcanbeexpressedas______inBernoulliequation.（）

答案:Thepiezometricheadorthestatic(pressure)headcanbeexpressedas_______inBernoulliequation.（）

答案:ThetotalheadinBernoulliequationcanbeexpressedas_____inBernoulliequation.（）

答案:

答案:Thetimemeansvalueoftheturbulentfluctuationoftheinstantaneousvelocityovertimeequalsto.（）

答案:zeroIntheEuleriandescription,wedon’treallycarewhathappenstoindividualfluidparticles;ratherweareconcernedwiththepressure,velocity,acceleration,etc.,ofwhateverfluidparticlehappenstobeattheinterestlocationandattheinteresttime.（）

答案:对Insteadyflow,streamlinesarecoincidentwithpathlinesandstreamlines.（）

答案:对

答案:对Thebuoyantforceonanybodyisequaltotheweightoffluiddisplaced.（）

答案:对

答案:16kpaThepressureunitpascalistoosmallforpressuresencounteredonpractice.Therefore,it’smultiplieskilopascalarecommonlyused.So1Kpa=pa.（）

答案:1000

答案:1000Theshearstressinfluidisnotproportionaltothemagnitudeofthefluiddeformation.（）

答案:错Theviscosityofliquidsdecreaseswithtemperature,whereastheviscosityofgasesincreaseswithtemperature.（）

答案:对Duetocapillarity,thecasesthatthelevelofthetubewillriseordepressiscalledcapillarityphenomena.（）

答案:对Forcapillarityphenomena,whenadhesionisbiggerthancohesion,thetubelevelisdepressed.（）

答案:错Viscosityrepresentstheinternalresistanceofafluidtomotion,whichisexpressedbySirIsaacNewtonfirstin1687.（）

答案:对Thetangentialcomponentofaforceactingonthesurfaceperunitiscalledthenormalstress.（）

答案:错Fluideventuallystopsdeformingatsomefixedstrainanglewhenaconstantshearforceisapplied.（）

答案:错Afluidcanresistanappliedshearstressbyd