Experimental study on viscosity of high purity air at low temperatures
The accurate thermophysical properties of the working fluid are the basis for industrial process calculations and equipment usage optimization.However,the lack of data on the viscosity of air below 190 K affects the engineering design and process optimization of industrial applications.In this work,the viscosity measurements of high purity air in gas,liquid,supercritical states were performed by using a low-temperature vibrating-wire viscometer at temperatures from 85 K to 190 K and pressures from 0.2 MPa to 5 MPa.The standard uncertainty of the viscosity measurements was estimated to be 2.64%over all the ranges of temperature and pressure.Measurement results can provide basic data for the optimization design of related technologies in industrial liquid air applications.
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