(3.2.1)--任务2.1测定黏度的意义.ppt

20211.Representation of viscosityMotion Viscositykinematic viscosity Ennis viscosityEngel viscometerPower ViscosityDynamic viscosity is also called absolute viscosity,It is a physical quantity that determines the viscosity of a fluid,When a fluid moves under the action of an external force,The internal friction between two adjacent layers of fluid molecules will block the flow of fluid,This property is called the viscosity of the fluid,According to Newtons law of viscosity,viscosity is defined:in the formula is the viscosity coefficient,which is an index to measure the viscosity of a fluid,Also called Dynamic Viscosity,Its physical meaning is The internal friction generated when two adjacent fluid layers having an area of 1 m2 and a vertical distance of 1 meter are moved relative to each other at a speed of 1 m/sRepresentation of viscosityInterchangeableTemperaturechemical composition When the number of carbon atoms is the same,the order of viscosity size among the various hydrocarbons is:Normal alkanes isomeric alkanes aromatic hydrocarbons cycloalkane And the viscosity increases with the increase of ring number and isomerization degree In the same class of hydrocarbons,as the relative molecular mass increases,the intermolecular gravitational force increases,then the viscosity also increases,so the heavier the petroleum fraction,the greater the viscosity.0201Factors affecting oil viscosityA d d T i t l eSignificance of determining Oil ViscosityClassification of lubricant gradesImportant quality indicators of jet fuelImportant indicators for process calculationsImportant quality indicators of diesel fuelGuidance of industrial production of lubricants according to viscosityMain quality indicators of lubricantsImportant parameters for storage and transportationT TH HA AN NK K202XTo be a man,one must grasp the proper measure and control the standard when doing things.We should take an optimistic and positive attitude,to grasp the proportions in the interaction with others,Make ourselves be a person who make others happy，let our happy heart become the same energy as the sun to radiate and warm othersTo radiate and warm others.