简介：ThispaperdescribesanewphenomenonofacousticstreamingwhichtakesplacewhenaHelmholtzresonatorisexcitedbyaninsidesoundsourcewithresonantfrequency,andtakestheformofastrongturbulentjet.Theflowvisualizations,hotwireandLDVmeasurementsarecombinedtoinvestigatetheprocessofacousticstreaming.ItisfoundthatthiskindofacousticstreamingresultsfromthecontributionofReynoldsstress.

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简介：磨擦，一枚戒指有弹性地支持了的一个磁盘的阶段特征被调查并且过去常解释僵硬增加现象的机制。只要磨擦被维持，磁盘上的磁盘和旋转的团之间的平均阶段差别毫无疑问是不到蟺/2。当磨擦完成时，阶段差别快速来临到蟺。这行为独立于磨擦系统的物理参数。理论结果是与实验验证的品质上。关键词僵硬增加现象-阶段特征-磨擦转子这个工程被支持由在里面英国的皇家学会和中国(10672006)的国家自然科学基础的来交情。

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简介：Whenweareoperatinglowtemperatureplasmaindustrialgeneratororexploitinglowtemperatureplasmaapplication,wehavealwaysobservedanenhanceddischargephenomenon.Suchas,whenweareworkingonplasmanitridingtreatmenttosteelworking

简介：Inthispaper,thephenomenononcollapsibletubedisplacementoscillation,anewbehaviorofthecollapsibletubepuisatileflowhasbeenstudied.Theexperimentsshowthatthecollapsibletube,inwhichtheflowisperiodicpuisatileintheupstream,willoscillateasasimplesupportedbeamwhenitiscollapsedtocertainextent,andthatifthetubeiscollapsedcontinue,thisoscillationwilltendtoweakandcompletelydisappearlastly.Ananalyticalmodelcorrespondingtothecollapsibletubedisplacementoscillationanditsgovernedequationsaresetupfromtheexperimentbackground.Byanalysingthemodelandsolvingtheequations,thecollapsibletubedisplacementoscillationpatternandtheoscillationoccurringordisappearingcriterionareobtained.Theresultspredictedbythisstudyareinagreementwiththoseobservedfromexperimentphenomena.

简介：Tostudythemechanicalpropertiesofthefilm/substratestructure,thefiniteelementcodeABAQUSv6.9-1isadoptedtosimulatethetensilemechanicalbehaviorofthenanoscalethinfilmbondedtoasubstrate.Thebifurcationphenomenonofthestructureunderuniaxialtensionisfound:thesingle-neckdeformation,themultiple-neckdeformationandtheuniformdeformation.Thesubstrateandthefilmareregardedaspower-hardeningmaterialsobeyingtheJ2deformationtheory.Firstly,theinfluenceofmaterialhardeningmatchontensilebifurcationmodeisanalyzedunderperfectlywell-bondedinterfacecondition.Then,theeffectsofinterfacialstiffnessandothersuperficialdefectssurroundingtheimperfectiononbifurcationmodeareinvestigated.Itisconcludedthatunderthewell-bondedinterfacecondition,ifthestressofthesubstrateislargerthanthefilm,thefilmwilluniformlydeformwiththesubstrate;ifthestressofthesubstrateissmallerthanthefilm,thefilmwillformasingleneck,exceptthecasethataweakly-hardeningfilmisbondedtoasteeply-hardeningsubstratewhenmultipleneckscanbeformed.Withthedecreaseofinterfacialstiffness,theuniformdeformationmodecantransformintothemultiple-neckdeformationmode,andfurthertransformintothesingle-neckdeformationmode.Andotherdefectssurroundingtheimperfectioncaninfluencethewavelengthofdeformationandnecknumber.

简介：Inthisstudy,thenull-fieldboundaryintegralequationmethod(BIEM)andtheimagemethodareusedtosolvetheSHwavescatteringproblemcontainingsemi-circularcanyonsandcirculartunnels.Tofullyutilizetheanalyticalpropertyofcirculargeometry,thepolarcoordinatesareusedtoexpandtheclosed-formfundamentalsolutiontothedegeneratekernel,andtheFourierseriesisalsointroducedtorepresenttheboundarydensity.Bycollocatingboundarypointstomatchboundaryconditionontheboundary,alinearalgebraicsystemisconstructed.Theunknowncoefficientsinthealgebraicsystemcanbeeasilydetermined.Inthisway,asemi-analyticalapproachisdeveloped.Followingtheexperienceofnear-trappedmodesinwaterwaveproblemsofthefullplane,thefocusingphenomenonandnear-trappedmodesfortheSHwaveproblemofthehalf-planearesolved,sincethetwoproblemsobeythesamemathematicalmodel.Inthisstudy,itisfoundthattheSHwaveproblemcontainingtwosemi-circularcanyonsandacirculartunnelhasthenear-trappedmodeandthefocusingphenomenonforaspecialincidentangleandwavenumber.Inthissituation,theamplificationfactorfortheamplitudeofdisplacementisover300.

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简介：[1]BattistiDS.1988.Thedynamicsand

简介：Fingeringphenomenaarecommonoccurrenceinthenaturalworld.Itgenerallytakesplacewhenalessviscousfluiddisplacesamoreviscousfluidtypicallyinporousmedia.Nowadays,suchphenomenahaveextensivelybeenstudiedduetoitsimportanceinmanyindustrialfields.Inthispaper,theeffectsofsurfacewettabilityonfingerpatternarestudiedandsimulatednumericallybytheLatticeBoltzmannmethod(LBM).Thedisplacementefficiencyisinvestigatedbyusingtwoparameters,namely,thebreakthroughtimeandthearealsweepefficiency.Thesimulationhasdemonstratedthatsurfacewettabilitywillinfluencethefingerpatternnomatterthegravityisconsideredornot,butinthepresenceofgravity,thefingerpatternismuchmorecomplicatedandirregularduetothecoexistenceandcompetitionofcapillaryforce,viscousforceandgravity.

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