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简介：ThispaperinvestigatesnumericallytheinherentirreversibilityinunsteadygeneralizedCouetteflowbetweentwoparallelplateswithvariableviscosity.ThenonlineargoverningequationsarederivedfromtheNavier-Stokesequationsandsolvednumericallyusingasemi-discretizationfinitedifferencemethodtogetherwiththeRunge-Kutta-Fehlbergintegrationscheme.Theprofilesofvelocityandthetemperatureobtainedareusedtocomputetheentropygenerationnumber,Bejannumber,skinfrictionandNusseltnumber.Theeffectsofembeddedparametersonentireflowstructurearepresentedgraphicallyanddiscussedquantitatively.

简介：ThispaperdiscussesthenonlinearstabilitybehaviourofdistortedplaneCouetteflowto2-dimensionaldisturbances,andcomparesitwiththatofdistortedplanePoiseuilleflow.TheresultsshowthatplaneCouetteflowismoreunstablethanplanePoiseuilleflowtofinite-amplitudedisturbances.

简介：ThispaperestablishesthevelocityfieldandtheadequateshearstresscorrespondingtothemotionofanOldroyd-BfluidbetweentwoinfinitecoaxialcircularcylindersbymeansoffiniteHankeltransforms.Theflowofthefluidisproducedbytheinnercylinderwhichappliesatime-dependentlongitudinalshearstresstothefluid.Theexactanalyticalsolutions,presentedinseriesformintermsofBesselfunctions,satisfyallimposedinitialandboundaryconditions.ThegeneralsolutionscanbeeasilyspecializedtogivesimilarsolutionsforMaxwell,secondgradeandNewtonianfluidsperformingthesamemotion.Finally,somecharacteristicsofthemotionaswellastheinfluenceofthematerialparametersonthebehaviorofthefluidmotionaregraphicallyillustrated.

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简介：ThispaperinvestigatestheunsteadyhydromagneticCouettefluidflowthroughaporousmediumbetweentwoinfinitehorizontalplatesinducedbythenon-torsionaloscillationsofoneoftheplatesinarotatingsystemusingboundarylayerapproximation.ThefluidisassumedtobeNewtonianandincompressible.Laplacetransformtechniqueisadoptedtoobtainaunifiedsolutionofthevelocityfields.Suchaflowmodelisofgreatinterest,notonlyforitstheoreticalsignificance,butalsoforitswideapplicatio...

简介：ThedissipationfunctioninturbulentplanePoiseuilleflows(PPFs)andplaneCouetteflows(PCFs)subjecttospanwiserotationsisanalyzed.Itisfoundthat,inthePCFswithoutsystemrotations,themeanpartisconstantwhilethefluctuationpartfollowsalogarithmiclaw,resultinginasimilarlogarithmicskinfrictionlawasPPFs.However,iftheflowsystemrotatesinthespanwisedirection,noobviousdependenceontherotationnumbercanbeevaluated.InthePPFswithrotations,thedissipationfunctionshowsanincreasewiththerotationnumber,whileinthePCFswithrotations,whentherotationnumberincreases,thedissipationfunctionfirstdecreasesandthenincreases.

简介：有温度分发上的放射效果的三维的Couette流动的理论分析被分析了，当在更低的静止的板的液体的注射是一条横向的正弦曲线时一个；它由通过上面的多孔的板的经常的吸的相应移动在一致运动。由于这类注射速度，流动变得三维。Prandtl数字的效果，放射参数；热转移的率上的注射参数被图的帮助检验了。Prandtl数字比注射或放射参数在温度分发上有大得多的效果。

简介：Thelinearstabilityofwall-injectedpressuredrivenCouette-likeflowinpower-lawfluidsisstudied.PreviousstudyonthiskindofflowforNewtonianfluidsbyNicoudandAngilella[Phys.Rev.E56,3000(1997)]wasextendedtopower-lawfluidstounderstandthee?ectsofshear-thinning/thickeningnatureontheflowstability.ArelatedexpressionbetweenthecriticalcrossflowReynoldsnumberforNewtonianfluidsandthatforpower-lawfluidsisobtainedasthestreamwiseReynoldsnumberislargeenoughbasedonnumericalcomputations,andverifiedtheoreticallyinthecaseofalimitingconditionwiththepower-lawindex.

简介：Inthispaper,theflowpatternsobservedinhorizontalCouette-Taylorflow(CTF)werecorrelatedusingdimensionlessnumbers.Theanalysisoftheresultsshowedthatthestructureoftheflowwasanoutcomeofinteractionbetweenfluidinertiarelatedtoaxialandrotationalflowsandgravitation.Therefore,theflowstructureswerecorrelatedusingaxialandangularReynoldsnumbers,andArchimedesnumberforthegivenvalueofgas-to-liquidflowratio.Finally,thecorrelationforthepredictionofthetransitiontotheflowregimeobservedathighrotationalspeedswasproposed.ThecomparisonwithexperimentscarriedoutintheverticalCTFfromtheliteratureshowedthatthiscorrelationcanalsobeusefulinthecaseofverticalflow.

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简介：<正>2002蔓延了一季的繁花褪去了童稚哀艳痴狂的深渊,惟有暖阳点缀着涟漪般美丽温和的味道。九月香樟错综的枝节掩着惶恐而过的飞鸟,沉甸甸的旅途我们一同踏上。作为初一的新生,我们理所当然地开始了在影尚一中最初的忙碌与彷徨,也享受到了特殊的待遇——被安排在了新建不久的宿舍楼。

简介：一．甲流：3—6小时内会急速发高烧（37．8℃以上），且会急速地全身性肌肉酸痛

简介：“通衢烟雨待邀月，塔影留馀胜处寻。碧水会澜谁问渡，人家怀古忆梵音。”说的是京杭大运河的十处风景。长约100公里的大运河杭州段，汩汩流淌，穿越杭州市最繁华、最丰饶的区域，沿途有数不胜数的文化遗产、历史遗迹。

简介：　　我们知道,后宫历来就是一个藏龙卧虎的地方,许多资质优秀的女人,原本可以成为著名女词人女画家女商人的,但在后宫,她们通通以工具的方式终了一生.……

简介：好风似水又如昨，但愿长醉流云间！

简介：1锈蚀凝固在斧刃，像一朵褐金色的蘑菇。柴房子只开个一尺见方的天窗，里面塞满板料、椽子、木墩、半成品的桌椅柜子，木头们高高低低、挤挤挨挨。是父亲的仓库，一个老木匠藏娇的金屋，但父亲给它一个贫贱的称呼：柴房子。事实上，从天窗射进的一道方正的光亮刚打下来，就被深深吸进密密匝匝的木头，柴房子幽暗如同洞窟。

简介：已经在市文化馆退休的画家田夫上午接到朋友的电话,说市里某拍卖会的拍品中有他的一幅画作,起拍价五万元。田夫觉得蹊跷,自己的画能值五万?下午,按照朋友提供的地址,画家找到了那家拍卖公司设在某宾馆的预展大厅,看到了署名田夫的那幅画。这幅画是一张画片,作品叫《喜悦》,镶在镜框里,大

简介：姑奶奶从乡下来家里，怕她闲着没事，女儿捧出了一堆她认为非常好看的书。我们上班、孩子上学的时候，姑奶奶在家里，果然非常认真地读那些书。晚上，我们回来吃过晚饭。女儿想起自己又有一本好书，匆匆跑去搜寻。”找到了!找到了!”她非常高兴地从屋子里跑出来，拿的是一本小人书，“这种书最适合姑奶奶了，妈妈，你那个年代不就是有这样的书吗7”