计算圆管内部湍流对流换热系数-强迫

ForcedConvectionHeatTransferCoefficientCorrelations(S.I.units)1.TurbulentFlowInsideaCircularTubeInputsCalculationsFluid=waterReynoldsNumber,Re=17,745Ave.FluidTemp,Tb=20oCPrandtlNumber,Pr=5.7PipeDiam.,D=20mmCorrelation#1,theDittusBoelterCorrelationPipeDiam.,D=0.020mTwallTfluid:Nuo=115(calculated)ho=12055Ave.Velocity,V=0.7m/s3348.522921TwallTfluid:Nuo=110FluidDensity,r=995kg/m3ho=11456Fluidviscosity,m=0.000785N-s/m23182.24f=0.02697FluidSp.Heat,Cp=4.19kJ/kg-KCorrelation#2:FluidThermalConductivity,k=0.58W/m-KNuo=123FluidThermalho=12817Conductivity,k=0.00058kJ/s-m-K3560.349172FluidThermalCorrelation#3:Conductivity,k=2.088kJ/hr-m-KNuo=123PipeLength,L=1.5mho=128183560.522493CorrectionforTemperatureVariation:(h=ho(mb/mw)0.14InputsCalculationsAve.FluidTemp,Tb=30oCCorrelation#1,theDittusBoelterCorrelationFluidVisc.atTb,mb=0.000785N-s/m2TwallTfluid:h=12607Ave.WallTemp,Tw=50oCTwallTfluid:h=11981FluidVisc.atTw,mw=0.00057N-s/m2Correlation#2:h=13405Correlation#3:h=13405EquationsforForcedConvectionFlowinsidePipesCorrelation#1,theDittusBoelterCorrelationCorrelation#1,theDittusBoelterCorrelationkJ/hr-m2-Kw/m2-KCorrelation#2,ConvectionH.T.,Turb.PipeFlowkJ/hr-m2-Kw/m2-KkJ/hr-m2-KCorrelation#3,ConvectionH.T.,Turb.PipeFloww/m2-KkJ/hr-m2-Kw/m2-KCorrelation#1,theDittusBoelterCorrelationkJ/hr-m2-K3501.971w/m2-KkJ/hr-m2-K3328.07w/m2-KkJ/hr-m2-K3723.504w/m2-KkJ/hr-m2-K3723.686w/m2-K