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ID:5454169
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时间:2017-11-12
《华工流体力学复习提纲》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、Chapter2Fluidflow流体流动fluidstaticsanditsapplicationNatureoffluidsDensity密度Incompressiblefluid不可压缩流体Compressiblefluid可压缩流体Pressure压强(压力)IndependentofdirectionUnitSI制:N/m2或Pa,mmHg,mH2OPg=Pabs–PatmPv=Patm-PabsHydrostaticequilibrium静力学方程hydrostaticequationapplication应用Utubemano
2、meterU形压差计的计算式Limitation:适用:静止、连续的同种不可压缩性流体;Incompressiblefluid、Continuousfluid压力形式能量形式Solution:图(a)∆p=Rg(ρm-ρ);图(b)∆p=Rg(ρm-ρ空)=Rgρm;图(c)∆p=Rg(ρm-ρE)图(d)∆p=Rgρm-hgρ。Chapter3Fluid-flowphenomena流体的流动现象Idealfluid理想流体HaszeroviscosityPotentialflowhastwocharacteristics:Irrigati
3、onalflowThereisnofrictionlossNewtonianfluid牛顿型流体theproportionalityconstantμForgas,itincreaseswithtemperatureForliquid,itdecreaseswithtemperature1Pa·S=10P(泊)=1000cP(厘泊)一、牛顿粘性定律Laminarflow层流/滞流fluidflowsinparallelstraightlines.withoutlateralmixingLaminarandturbulentflow滞流和湍流
4、Turbulentflow湍流fluidmoveserraticallyinformofcrosscurrentsandeddiesReynoldsnumber雷诺准数●Re≤2100,flowislaminarflow滞流Re≥4000,flowisturbulence湍流●21005、体在管内边界层的发展Boundary-layerseparationandwakeformation边界层的分离Chapter4basicequationsoffluidflow流体动力学Massbalance连续性方程incompressiblefluid,flowthroughthestationaandbMechanicalenergybalance柏努力方程J/kgmpa应用范围Forincompressibleflow(不可压缩流体.)2.Withoutfrictionloss3.Forunit...Chap5Incompress6、ibleflowinpipesandchannels流体流动阻力λ=4fShearstressandskinfrictioninpipes直管阻力直管阻力通式(范宁公式Flowinnoncircularchannel非圆形管内的流动阻力当量直径直径de代替非圆形管dVelocitydistributioninapipe流体在圆管内速度分布层流流动时,平均速度与最大速度的关系:u=0.5umax湍流流动时,平均速度与最大速度的关系:u=0.87umaxHagen-Poiseuilleequation哈根一泊谡叶公式Turbulentflowi7、npipes湍流流动Laminarflowinpipes层流流动frictionfactorandfrictioncoefficientchart莫狄(Moody)摩擦因数图Frictionfromchangesinvelocityordirection局部阻力计算FrictionlossfromsuddenexpansionofcrosssectionFrictionlossfromsuddencontractionofcrosssectionEffectoffittingsandvalvesu------小管平均流速PipeFlowSy8、stems管路计算SinglePipes简单管路MultiplePipesSystems复杂管路Chapter6flowpastimmersedbodies非均相物系分离Ter
5、体在管内边界层的发展Boundary-layerseparationandwakeformation边界层的分离Chapter4basicequationsoffluidflow流体动力学Massbalance连续性方程incompressiblefluid,flowthroughthestationaandbMechanicalenergybalance柏努力方程J/kgmpa应用范围Forincompressibleflow(不可压缩流体.)2.Withoutfrictionloss3.Forunit...Chap5Incompress
6、ibleflowinpipesandchannels流体流动阻力λ=4fShearstressandskinfrictioninpipes直管阻力直管阻力通式(范宁公式Flowinnoncircularchannel非圆形管内的流动阻力当量直径直径de代替非圆形管dVelocitydistributioninapipe流体在圆管内速度分布层流流动时,平均速度与最大速度的关系:u=0.5umax湍流流动时,平均速度与最大速度的关系:u=0.87umaxHagen-Poiseuilleequation哈根一泊谡叶公式Turbulentflowi
7、npipes湍流流动Laminarflowinpipes层流流动frictionfactorandfrictioncoefficientchart莫狄(Moody)摩擦因数图Frictionfromchangesinvelocityordirection局部阻力计算FrictionlossfromsuddenexpansionofcrosssectionFrictionlossfromsuddencontractionofcrosssectionEffectoffittingsandvalvesu------小管平均流速PipeFlowSy
8、stems管路计算SinglePipes简单管路MultiplePipesSystems复杂管路Chapter6flowpastimmersedbodies非均相物系分离Ter
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