冶金传输原理实验报告(传热学)

课程编号：03402720课程名称：冶金传输原理冶金传输原理实验报告（传热学）Speciality________________Class___________________Ordernumber_______________Name__________________实验一粉末或散装材料导热系数测定实验报告测量数据记录：thethermoemfofthethermocouple（热电偶热电势）Theouterwallsurfaceofthesmallball小球外壁面Themeasuringpointofthethermocouple热电偶测点123Themeanvalue平均值Thethermoemf(mV)热电势(mV)Theinnerwallsurfaceofthebigball大球内壁面Themeasuringpointofthethermocouple热电偶测点456Themeanvalue平均值Thethermoemf(mV)热电势(mV)2.thepoweroftheelectricheater(itistheheattransferquantity)电加热器功率（亦即传热量）thecurrent（电流）：（A）thevoltage（电压降）：（V）3.thematerialoftheexperiment（实验材料）：Ⅱ.Datareduction（数据整理）Thetemperatureoftheouterwallofthesmallball（小球外壁温度）：Thetemperatureoftheinnerwallofthebigball（大球内壁温度）：Theheattransferquantity（传热量）：wⅢ.Theresultoftheexperiment（数据整理）：1、实验结果，的导热系数coefficient 2.whencompareitwiththetheoreticalvalue,thecomparingresultis:与理论值相比较结果是：TestTwoTomeasuretheguidelineequationandthemeanconvectionheattransfercoefficientwhentheairverticallysweepsalongthesingle-pipe实验二空气横掠单管时平均对流换热系数及准则方程式测定实验Ⅰ.Torecordthemeasuringdata.（测量数据记录）1.thesizeofthemodel：（试件尺寸）theouterdiameter（外径）：D=m,theeffectivelength（有效长度）：L=0.1m.theareaofdissipation（散热面积）：m2.2.theatmospherictemperature（大气温度）：oC,thecorrespondingthermoemf（大气温度对应热电势）：=mV,theatmospheredensity(werefertothetablefrom).大气密度（用查表得）kg/m3.3.themeasuredvalueineveryoperationcondition.（各工况实测数值）工况斜压计读H(mm)测工作电压时电位差计读数V(mV)测工作电流时电位差计读数A(mV)过余温差热电势E(mV)12345Ⅱ.Datareduction（实验数据整理）Theoperationcondition（工况）12345Theaircurrentkineticpressure△h=0.2H(mmH2O)（气流动压）Thevelocityoftheaircurrent(m/s)（气流速度）TheheatingquantityQ加热量Q工作电流I=电位差计读数(mV)×2(A)工作电压V=电位差计读数(mV)×0.201(V)Q=IV(W)ThewallteMperatureofthemodel试件温度(mV)(oC)Thequalitativetemperature（定性温度）导热系数（用tm查表得）(w/moC)Thekinematicviscosity运动黏度（用tm查表得）(m2/s)Theheattransfercoefficient（换热系数）(w/m2oC)Nu–number努谢尔特数Reynoldsnumber雷诺数1=2=3=4=5=1=2=3=4=5=;;;;Ⅲ.Theresultoftheexperiment（实验结果）1.from：（根据）weget（解出得）()2.wegettheguidelineequationis（得出的准则方程是）：TestThreeTomeasuretheanglefactorfromtheinfinitesimalelementsurfacedA1tothefinitesurfaceA2实验三微圆表面dA1到有限表面A2的角系数测定实验报告Ⅰ.Torecordthemeasuringdata.（测量数据记录）1.thedataofmeasuringtheanglefactor（测量角系数时数据）：TheareaAspwhichismeasuredbytheplanimeter求积仪测出的面积Asp(mm2)The1st第一次The2nd第二次The3rd第三次Themeanvalue平均值TheradiusRofthecircleinthewhitepaper(mm)测量白纸上圆的半径R(mm)2.thedataofcalculatingtheanglefactor（计算角系数时数据）：thesizeofa,b,cintheFig4oftheexperimentguidebook.（实验指导书图中a、b、c尺寸）：=mm；=mm,=mm.=;=.Ⅱ.Datareductionandtheresultoftheexperiment（数据整理及结果）1.=；2.=