mixprops

Mixture properties calculator.

Installation

Python

pip install mixprops --upgrade

Configuration

Using a settings.yaml configuration file, you can specify the units system used for computation.

Available units systems:

• SI - International System of Units
• SIC - International System of Units with temperature in degrees Celsius (DEFAULT)
• IS - Imperial Unit System (currently this only assumes a temperature in degrees Fahrenheit)

You may also overwrite the default Pressure unit of Pascal:

• Pa - Pascal
• kPa - Kilopascal
• Mpa - Megapascal
• bar - bar

Example

units: "SI" # International System of Units
pressure_unit: "kPa" # Kilopascal

Properties

• molecular_weight - Molecular weight (g/mol)
• density - Density (kg/m3)
• specific_heat_capacity - Specific heat capacity (J/kg-K)
• viscosity - Viscosity (kg/m-s)
• conductivity - Thermal conductivity (W/m-K)
• speed_of_sound - Speed of sound (m/s)
• adiabatic_index - Adiabatic index

Supported species

For the supported species, see the .csv files in the mixprops/data directory.

Examples

from mixprops.mixture import Mixture
from mixprops.state import State

mixture = Mixture(
    species=[("O2", 0.21), ("N2", 0.79)],
    state=State(pressure=101325, temperature=25))

print(mixture.specific_heat_capacity)
# 1011.3387518918726

CLI

Follow instructions from pipx to install pipx.

pipx install git+https://github.com/oaarnikoivu/mixprops.git

mixprops \
    --units SIC \
    --pressure-unit Pa \
    --state 101325,25 \
    --species O2,N2 \
    --composition 0.21,0.79

• --units = Units system -> Optional, defaults to SIC
• --pressure-unit = Pressure unit -> Optional, defaults to Pa
• --state = Mixture state -> Absolute pressure,temperature
• --species = Comma separated list of species by name or species -> O2,N2 or Oxygen,Nitrogen
• --composition = Species molar composition as comma separated mole fractions -> 0.21,0.79