How is the dynamic viscosity of a compressible fluid under pressure calculated?
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Question: How is the dynamic viscosity of a compressible fluid under pressure calculated? For example, how can one determine the dynamic viscosity of compressed air at 1.4 MPa and 80 degrees Celsius? Or where can I check it? Ordinary books only provide the dynamic viscosity of gases at different temperatures under one atmosphere of pressure. Thank you! ! !
Kinematic viscosity is the ratio of a liquid’s dynamic viscosity to its density ρ at the same temperature. The unit is (m^2)/s. It is denoted by the lowercase letter v. You can look up dynamic viscosity and density for calculations in inorganic handbooks or charts of chemical property values.
I am referring to the motion or dynamic viscosity of compressible fluids, mainly gas-like media. Thank you!
Kinematic viscosity = viscosity/density. The text in \"Principles of Chemical Engineering\" (Tianjin University edition, page 29) states as follows: The viscosity of gases increases only slightly with rising pressure, and this effect can be ignored in most engineering calculations; the influence of pressure on gas viscosity needs to be considered only at extremely high or low pressures. In my opinion, 1.4 Mpa does not fall within the range of extremely high pressures, and it can be estimated using the dynamic viscosity at 80 degrees Celsius.