This does not yet include AV's latest tweaks (M3 above) - however the differences for most applications should be quite minor. The other (written by A.V.) takes theĪ python version has now also been written by Matthew Partridge at Cranfield University. Tabulated values and viscosity units conversion are given below the figures. One takes volume fraction of glycerine as input. Absolute or dynamic viscosity is used to calculate Reynold's Number to determine if a fluid flow is laminar, transient or turbulent. Further refinements from Andreas Volk to density of pure water, and the temperature-dependence of the contraction of the mixture. In view of the importance of air in science and technology and the abundance of experi mental data, we present in this report a consistent set of critically evaluated data and an up-to-date correlation of the viscosity and the thermal conductivity of air in the gaseous phase over a wide range of temperature and pressure. In both cases the fit was chosen to match data from Gregory (table 3 and 7) Andreas Volk pointed out that the density calculation can be made more accurate by (i) accounting for the volume contraction of the mixture (ii) adjusting the fit for the density of pure glycerine as a function of temperature. It is placed in a duct carrying air at a temperature of 200 C moving. Thanks to Paul Debue for pointing this out. If the sensor has an effective thermal conductivity of 12 W/m C and is immersed. The mixture should use the glycerine fraction by VOLUME and not by mass. Density calculation has been changed: equation 25 in Cheng's paper to compute the density of ![]() I'd recommend reading the latter paper first. Kähler (2018) Experiments in Fluids 59 75. 47 3285-3288, with a number of adjustments (see below), which are described in Volk and The calculation is based on the parameterisation in Cheng (2008) Ind. Calculate density and viscosity of glycerol/water mixturesĭynamic viscosity of mixture is :
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