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Kinematic Viscosity

Particula Index / Particula / Gas / Properties / Kinematic Viscosity

Auto-generated documentation for particula.gas.properties.kinematic_viscosity module.

get_kinematic_viscosity

Show source in kinematic_viscosity.py:31

Calculate the kinematic viscosity of a fluid.

The function calculates ν by dividing the dynamic viscosity (μ) by the fluid density (ρ).

  • ν = μ / ρ
    • ν is Kinematic viscosity [m²/s].
    • μ is Dynamic viscosity [Pa·s].
    • ρ is Fluid density [kg/m³].

Arguments

  • dynamic_viscosity : Dynamic viscosity of the fluid [Pa·s].
  • fluid_density : Density of the fluid [kg/m³].

Returns

  • The kinematic viscosity [m²/s].

Examples

Example usage
import particula as par
par.gas.get_kinematic_viscosity(1.8e-5, 1.2)
# Output: ~1.5e-5

References

  • "Viscosity Conversion Formula," Wolfram Formula Repository. https://resources.wolframcloud.com/FormulaRepository/resources/Viscosity-Conversion-Formula

Signature

@validate_inputs({"dynamic_viscosity": "positive", "fluid_density": "positive"})
def get_kinematic_viscosity(dynamic_viscosity: float, fluid_density: float) -> float: ...

get_kinematic_viscosity_via_system_state

Show source in kinematic_viscosity.py:70

Calculate the kinematic viscosity of air by first computing its dynamic viscosity.

This function uses get_dynamic_viscosity(...) and divides by the given fluid_density to get the kinematic viscosity.

  • ν = μ / ρ
    • ν is Kinematic viscosity [m²/s].
    • μ is Dynamic viscosity [Pa·s].
    • ρ is Fluid density [kg/m³].

Where: - ν is Kinematic viscosity [m²/s]. - μ is Dynamic viscosity [Pa·s]. - ρ is Fluid density [kg/m³].

Arguments

  • temperature : Desired air temperature [K]. Must be > 0.
  • fluid_density : Density of the fluid [kg/m³].
  • reference_viscosity : Reference dynamic viscosity [Pa·s].
  • reference_temperature : Reference temperature [K].

Returns

  • The kinematic viscosity of air [m²/s].

Examples

Example usage
import particula as par
par.gas.get_kinematic_viscosity_via_system_state(300, 1.2)
# Output: ~1.5e-5

References

  • "Sutherland's Formula," Wolfram Formula Repository, https://resources.wolframcloud.com/FormulaRepository/resources/Sutherlands-Formula

Signature

@validate_inputs({"temperature": "positive", "fluid_density": "positive"})
def get_kinematic_viscosity_via_system_state(
    temperature: float,
    fluid_density: float,
    reference_viscosity: float = REF_VISCOSITY_AIR_STP,
    reference_temperature: float = REF_TEMPERATURE_STP,
) -> float: ...

See also