I need the density and viscosity of a molecular fluid under relatively high pressures, I expect something around 500 MPa. This kind of measurement is way outside my field, and I can find only very few groups who appear to be capable of it, all of which refused for technical reasons so far. Does anyone know a collaborator for high pressure rheology and/or densitometry?
Hello DR Frederik:
"Density Determinations. The determination of accurate viscosity data using the high-pressure viscometer requires the availability of accurate liquid density data. Compressed liquid density at elevated pressure and temperature can be measured with some certainty using experimental methods. "
Article Density and Viscosity Measurement of Diesel Fuels at Combine...
Thank you Ijaz Durrani for this suggestion, I contacted the corresponding author.
Hi Frederik
We have a high pressure viscometer to measure the pressure and temperature effects on the viscosity of liquids. 500 MPa is not a problem, we do routinely tests at similar pressure.
An accurate measurement of density in that pressure range could be a problem, because this parameter generally does not vary that much, and in any case much less than viscosity. And we have no facility to carry out such measurements, we use Tait or Murnagham equations to estimate density variations vs. pressure.
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