《工业分析 Industrial Analysis》课件-色拉油运动黏度的测定（双语）

项目八：常规物理常数与性能分析任务七：黏度的测定

色拉油运动黏度的测定课程：工业分析中文Scenario8:PhysicalconstantsandperformancetestingTask7:DeterminationofviscosityDeterminationofkinematicviscosityofsaladoilCourse:IndustrialAnalysisEglish在一定温度下，当液体在直立的毛细管中，以完全湿润的状态流动时，其运动黏度与时间成正比。测定时，用已知运动黏度的液体作为标准，测量其从毛细管黏度计流出的时间，再测量试样自同一粘度计流出时间，则可计算出试样的黏度。1、测定原理中文Atacertaintemperature,whenaliquidflowsinacompletelymoiststateinanuprightcapillary,itsviscosityisdirectlyproportionaltotheflowtime.Whenmeasuring,usealiquidwithknownkinematicviscosityasthestandard,measurethetimeittakesforittoflowoutofthecapillaryviscometer,andthenmeasurethetimeittakesforthesampletoflowoutofthesameviscometer.Thiscancalculatetheviscosityofthesample.1、MeasurementprincipleEglish2、测定仪器毛细管黏度计毛细管粘度计一套毛细管粘度计共有13根，内径分别为0.4、0.6、0.8、1.0、1.2、1.5、2.0、2.5、3.0、3.5、4.0、5.0、6.0mm，测定时根据试样粘度选择合适粘度计，使流出时间为120~480s。中文2、Measurementinstrument-capillaryviscometercapillaryviscometerThereareatotalof13capillaryviscometerswithinnerdiametersof0.4,0.6,0.8,1.0,1.2,1.5,2.0,2.5,3.0,3.5,4.0,5.0,and6.0mm.Whenmeasuring,appropriateviscometersareselectedbasedontheviscosityofthesampletocontroltheliquidflowtimefrom120to480s.Eglish恒温装置容积不小于2L，高度不小于180mm，带有自动控温及自动搅拌器。中文ThermostaticdeviceThevolumeoftheconstanttemperaturedeviceisnotlessthan2L,theheightisnotlessthan180mm,anditisequippedwithautomatictemperaturecontrolandautomaticmixer.Eglish3、测定步骤清洗黏度计：用洗液、水、乙醇洗，干燥待用取样：将色拉油吸入粘度计恒温：将粘度计放入事先调好温度的恒温水浴中测定：将色拉油吸到标线a以上，记录从a标线流到b标线所需时间倾出试样，清洗黏度计中文3、MeasurementstepsCleaningtheviscometer:Washwithdetergent,water,andethanol,dryandsetasideforuseSampling:InhalesaladoilintoaviscometerConstanttemperature:PlacetheviscometerinapreadjustedconstanttemperaturewaterbathMeasurement:SuckthesaladoilabovelineaandrecordthetimeittakesforthesaladoiltoflowfromlineatolinebPouroutthesampleandcleantheviscometerEglish重复测定三次以上，误差不超过0.2秒并取平均值。松开洗耳球，放开C管的夹子，空气进入C管后，立即水平地注视液面的下降.用秒表记下液面流经a和b线的时间即为流出时间。abt1=t´-t即为流出时间tt′中文Repeatthemeasurementmorethanthreetimeswithanerrorofnomorethan0.2seconds,andtaketheaveragevalueasthemeasurementresult.abt1=t´-tThatistheoutflowtimett′Eglish4、结果计算中文4、Resultca