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Precise estimation of air properties as a function of temperature at 1 atm
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Kosta
Precise estimation of air properties as a function of temperature at 1 atm
Here are some links that look like they might be useful, there seems to be promising information on some engineering resource sites:
https://onlinelibrary.wiley.com/doi/pdf/10.1002/9780470516430.app2
This is the appendix from what appears to be an engineering textbook, it gives a chart of the information you're looking for at 1 atm and 15 C. It also walks you through the temperature dependent equations for some of the properties.
https://irc.wisc.edu/properties/ This is a handy little calculator that outputs a whole host of properties of fluids, including dry air.
The point that has been made about water vapor fluctuations is valid, but most calculations of air properties assume dry air with constant composition.
Here are some links that look like they might be useful, there seems to be promising information on some engineering resource sites:
https://onlinelibrary.wiley.com/doi/pdf/10.1002/9780470516430.app2This is the appendix from what appears to be an engineering textbook, it gives a chart of the information you're looking for at 1 atm and 15 C. It also walks you through the temperature dependent equations for some of the properties.
https://irc.wisc.edu/properties/ This is a handy little calculator that outputs a whole host of properties of fluids, including dry air.
The point that has been made about water vapor fluctuations is valid, but most calculations of air properties assume dry air with constant composition.
I have a similar table for air properties at 1 atm. I also found some other calculators, but calculating every values in a calculator is not very productive for my purposes, however, the "Appendix B" looks very promising - I will have to try the differences for values computed as a temperature function to those in the chart, if the correlation is satisfying, Im all settled :).More
The data are ( at least mostly ) presented as combination of an online calculator, tabelated numerical values and charts, instead of specific empirical formulas. But it should not be a big deal to invent some interpolation or approximation formulas for those tabelated numerical values.
See also the Related documents section in the latter link, a chosen topics:
Air - Composition and Molecular Weight
Air - Density at varying pressure and constant temperatures
Air - Density, Specific Weight and Thermal Expansion Coefficient at Varying Temperature and Constant Pressures
Air - Diffusion Coefficients of Gases in Excess of Air
Air - Dynamic and Kinematic Viscosity
Air - Molecular Weight and Composition - Dry air
Air - Properties at Gas-Liquid Equilibrium Conditions
Air - Specific Heat at Constant Temperature and Varying Pressure
Air - Thermal Conductivity
Air - Thermal Diffusivity
Air - Thermophysical Properties
The data are ( at least mostly ) presented as combination of an online calculator, tabelated numerical values and charts, instead of specific empirical formulas. But it should not be a big deal to invent some interpolation or approximation formulas for those tabelated numerical values.
See also the Related documents section in the latter link, a chosen topics:
Air - Composition and Molecular Weight Air - Density at varying pressure and constant temperatures Air - Density, Specific Weight and Thermal Expansion Coefficient at Varying Temperature and Constant Pressures Air - Diffusion Coefficients of Gases in Excess of Air Air - Dynamic and Kinematic Viscosity Air - Molecular Weight and Composition - Dry air Air - Properties at Gas-Liquid Equilibrium Conditions Air - Specific Heat at Constant Temperature and Varying Pressure Air - Thermal Conductivity Air - Thermal Diffusivity Air - Thermophysical Properties
I know... it wont be horrible. In general, I was just very curious whether I missed any empirical equations, which would solve my problem most efficiently.More
But putting a table to Excel and processing some numerical analysis.... E.g. the obvious and trivial least square method for a polynomial or rational function via Excel Solver..... At least you know this is the last resort option if you do not find anything better.More
Thanks, as matter of fact, the engineeringtoolbox was the first thing I found, however, when I had to always fill out their calculator (which is great for its purpose), I realized that I need to put calculations to MS Excel, because it was very slow.More
Here are some links that look like they might be useful, there seems to be promising information on some engineering resource sites:
The point that has been made about water vapor fluctuations is valid, but most calculations of air properties assume dry air with constant composition.
Here are some links that look like they might be useful, there seems to be promising information on some engineering resource sites:
The point that has been made about water vapor fluctuations is valid, but most calculations of air properties assume dry air with constant composition.
More
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A lot can be found at engineeringtoolbox , like air-prandtl-number-viscosity-heat-capacity-thermal-conductivity.
The data are ( at least mostly ) presented as combination of an online calculator, tabelated numerical values and charts, instead of specific empirical formulas. But it should not be a big deal to invent some interpolation or approximation formulas for those tabelated numerical values.
See also the Related documents section in the latter link, a chosen topics:
A lot can be found at engineeringtoolbox , like air-prandtl-number-viscosity-heat-capacity-thermal-conductivity.
The data are ( at least mostly ) presented as combination of an online calculator, tabelated numerical values and charts, instead of specific empirical formulas. But it should not be a big deal to invent some interpolation or approximation formulas for those tabelated numerical values.
See also the Related documents section in the latter link, a chosen topics:
More
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