《工业分析 Industrial Analysis》课件-色拉油绝对黏度的测定（双语）

项目八：常规物理常数与性能分析任务七：黏度的测定色拉油绝对黏度的测定课程：工业分析中文Scenario8:PhysicalconstantsandperformancetestingTask7:DeterminationofviscosityDeterminationofabsoluteviscosityofsaladoilCourse:IndustrialAnalysisEglish将特定的转子浸于被测液体中做恒速旋转运动，使液体接受转子与容器壁之间发生的切应力，维持这种运动所需的扭力矩由指针显示读数，根据此读数α和系数K可求出试样的绝对黏度（动力黏度）。1、测定原理η：样品的绝对黏度；

K：旋转黏度计系数；α：旋转黏度计指针的读数。中文Immerseaspecificrotorinthemeasuredliquidandperformaconstantrotationalmotion,sothattheliquidreceivestheshearstressthatoccursbetweentherotorandthecontainerwall.Therequiredtorquetomaintainthismotionisdisplayedbyapointerreadingα，BasedonthisreadingandcoefficientK,theabsoluteviscosity(dynamicviscosity)ofthesamplecanbedetermined.1、Measurementprincipleη：Theabsoluteviscosityofthesample;K：Thecoefficientoftherotationalviscometer;α：Thereadingcorrespondingtothepointeroftherotaryviscometer.Eglish2、测定仪器转子，分0、1、2、3、4号，号约小转子越大，适于粘稠性低的物体测量旋转黏度计中文2、MeasurementinstrumentRotors,dividedintonumbers0,1,2,3,and4,withthesmallerthenumber,thelargertherotor,suitableformeasuringobjectswithlowviscosityrotationalviscometerEglish旋转黏度计原理图1-同步电机，2-刻度盘、3-游丝，4-转子，5-指针同步电机以一定的速度带动刻度圆盘旋转，又通过游丝和转轴带动转子旋转。若转子未受到阻力，则游丝与刻度圆盘同速旋转；当样液存在时，转子受到粘滞阻力的作用使游丝产生力矩。当两力达到平衡时，与游丝相连的指针在刻度圆盘上指示出一数值，根据这一数值，结合转子号数及转速即可算出被测样液的绝对粘度。中文Schematicdiagramofrotaryviscometer1-Synchronousmotor,2-dial,3-hairspring,4-rotor,5-pointerThesynchronousmotordrivesthescaledisktorotateatacertainspeed,andthendrivestherotortorotatethroughthehairspringandshaft.Iftherotorisnotsubjecttoresistance,thehairspringrotatesatthesamespeedasthedial;Whenthesampleliquidispresent,therotorissubjectedtoviscousresistance,causingthehairspringtogeneratetorque.Whenthetwoforcesreachequilibrium,thepointerconnectedtothehairspringindicatesavalueonthedial.Basedonthisvalue,theabsoluteviscosityofthemeasuredsampleliquidcanbecalculatedbycombiningtherotornumberandspeed.Eglish3、测定步骤估计色拉油的黏度范围，根据仪器的量程表选择合适的转子和转速，使读数在刻度盘的20%～80%范围内。将试样恒温至所测温度，并保持恒温转子逐渐浸入色拉油。中文3、Measurementsteps

Estimatetheviscosityrangeofsaladoil,selecttheappropriaterotorandspeedbasedontheinstrument'srangetable,sothatthereadingiswithintherangeof20%to80%ofthedial.KeepthesampleconstanttemperaturetothemeasuredtemperatureandmaintainaconstanttemperatureTherotorisgraduallyimmersedinsaladoil.Eglish调整仪器水平，选择合适转速，放下指针控制杆，开启电源，待转速稳定后，按下指针控制杆，观察指针在读数窗口时，关闭电源，读数。重复两次，取平均值。测定结束后，拆下转子和保护架，用无铅汽油洗净转子和保护架，并放入仪器箱中。中文Adjusttheinstrumentlevel,selecttheappropriatespeed,lowerthepointercontrollever,turnonthepower,waitforthespeedtostabilize,pressthepointercontrollever,observethepointerinthereadingwindow,turnoffthepower,andread.Repeattwiceandtaketheaveragevalue.Afterthemeasurementiscompleted,removetherotorandprotectiveframe,washthemwithlead-freegasoline,andplacethemintheinstrumentbox.Eglish4、注意事项装卸转子时应小心操作，装拆时应将连接螺杆微微抬起进行操作，不要用力过大，不要使转子横向受力。

连接螺杆和转子的连接端面及螺纹处应保持清洁，否则将影响转子的正确连接及转动时的稳定性。每次使用完毕，应及时清洗转子。装上０号转子后，不得在无液体的情况下“旋转”，以免损坏轴尖中文4、NoteBecarefulwhenloadingandunloadingrotors.Whenassemblinganddisassembling,theconnectingscrewshouldbeslightlyliftedforoperation,andexcessiveforceshouldnotbeexertedtopreventtherotorfrombeingsubjectedtolateralforce.Theconnectingendfaceandthreadofthescrewandrotorshouldbekeptclean,otherwiseitwillaffectthecorrectconnectionandstabilityof