flowtube.viscosity_density

Handles the calculation of the viscosity and density of a variety of pure gases.

Functions

dynamic_viscosity(obj, gas)	Estimate absolute/dynamic viscosity of pure gases using the corresponding states method from Reid et al., 1987.
real_density(obj, gas)	Calculates the real density of a gas using van der Waal's equation of state.

Classes

basic_attrs(*args, **kwargs)

class flowtube.viscosity_density.basic_attrs(*args, **kwargs)

P: float

T: float

__init__(*args, **kwargs)

flowtube.viscosity_density.real_density(obj, gas)

Calculates the real density of a gas using van der Waal’s equation of state.

Parameters:

• obj (basic_attrs) – Object with basic attributes (P in Pa, T in K).

• gas (str) – Molecular formula of gas (supported: Ar, He, N2, O2).

Returns:

Real density of gas in kg m-3.

Return type:

float

flowtube.viscosity_density.dynamic_viscosity(obj, gas)

Estimate absolute/dynamic viscosity of pure gases using the corresponding states method from Reid et al., 1987.

Parameters:

• obj (basic_attrs) – Object with basic attributes (P in Pa, T in K).

• gas (str) – Molecular formula of gas (supported: Ar, He, N2, O2).

Returns:

Gas viscosity (kg m-1 s-1).

Return type:

float