资源描述：
《流变学基础-粘度测量方面》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。
1、SECTIONV:SECTIONV:RheologyRheology流变学流变学TypicalrangeofSituationApplicationshearrates(s-1)Sedimentationoffinepowders10-6–10-4Medicines,PaintsinasuspendingliquidLevelingduetosurface10-2–10-1Paints,printinginkstensionPaintingandcoating,toiletDrainingundergravity10-1–1
2、01bleachesExtruders100–102PolymersChewingandswallowing101–102FoodsDipcoating101–102Paints,confectioneryMixingandstirring101–103ManufacturingliquidsPipeflow100–103Pumping,bloodflowSpray-dying,painting,fuelSprayingandbrushing103–104atomizationApplicationofcreamsandRu
3、bbing104–105lotionstotheskinMillingpigmentsinfluidbases103–105Paints,printinginksHighspeedcoating105–106PaperLubrication103–107GasolineenginesFluidFluidModelModel流体模型流体模型V=Velocity(cm/sec)MoveablePlatesA=Areacm2F=ForceA=Areacm2dynesX=DistancedxStationaryPlatesdvShe
4、arRate(FlowGradient)ShearRate(FlowGradient)剪切率（流动梯度）剪切率（流动梯度）Assumption:Platelengthissignificantlygreaterthandistancebetweenplates.EquationsEquations公式公式剪切应力（力/单位面积）Letτ=Force/UnitAreaτ=Dynes/cm2τ=ShearStress(dynes/cm2)剪切率（速度梯度）•Letγ=TheVelocityGradient=ShearRate•γ
5、=dv/dx=V/X=ShearRate•γ=V(cm/sec)/X(cm)•-1γ=ShearRate(sec)EquationsEquations(continued)粘度（剪切应力/剪切率)Letη=ShearStress/ShearRateη=(Dynes/cm2)/(sec-1)η=Viscosity(Poise)1Poise=100CentipoiseUnitsUnits单位单位动力粘度或旋转粘度:Brookfield•SIUnitsmPa•s•CommoncP•Conversion1cP=1mPa•s运动粘度:
6、毛细管、杯•SIUnitsmm2/s•CommoncSt“Centistokes”•Conversion1mm2/s=1cStToconvertfromKinematictoDynamic,simplymultiplybySpecificGravity:cStxSG=cPmm2/sxSG=mPa•s只适用于牛顿流体FluidsFluids流体流体°Newtonian牛顿流体:Mineraloil矿物油,water水,honey蜂蜜,silicone硅油,glycerin甘油°Non-Newtonian:非牛顿流体•Pseud
7、oplastic假塑性:handlotion润手乳液,ink油墨,shampoo香波•Dilatant膨胀性:cornstarch玉米淀粉,ceramicslurry陶瓷泥浆,cement水泥•Plastic塑性:ketchup番茄酱,mayonnaise蛋黄酱•Thixotropic触变性:latexpaint乳胶涂料NewtonianNewtonian牛顿流体牛顿流体NonNon--NewtonianNewtonian非牛顿流体非牛顿流体PseudoplasticPseudoplastic假塑性假塑性NonNon--Ne
8、wtonianNewtonian非牛顿流体非牛顿流体PlasticPlastic(withyield)(withyield)塑性（带屈服力）塑性（带屈服力）NonNon--NewtonianNewtonian非牛顿流体非牛顿流体DilatantDilatant膨胀性膨胀性TimeDepen
