flowtube.diffusion_coef

Handles the calculation of the diffusion coefficient of a binary gas mixture.

Citations: Reid, R.C., Prausnitz, J.M., Poling, B.E., 1987. The Properties of Gases and Liquids, 4th ed. McGraw-Hill, New York.

Attributes

`sigmas`
`e_ks`

Classes

required_attrs

Base class for protocol classes.

Functions

`non_polar_Lennard_Jones_potential`(→ float)	Calculation of non-polar Lennard-Jones Potential for a binary gas
`binary_diffusion_coefficient`(→ float)	Calculation of non-polar diffusion coefficient for a low pressure

Module Contents

class flowtube.diffusion_coef.required_attrs[source]

Bases: Protocol

Base class for protocol classes.

Protocol classes are defined as:

class Proto(Protocol):
    def meth(self) -> int:
        ...

Such classes are primarily used with static type checkers that recognize structural subtyping (static duck-typing).

For example:

class C:
    def meth(self) -> int:
        return 0

def func(x: Proto) -> int:
    return x.meth()

func(C())  # Passes static type check

See PEP 544 for details. Protocol classes decorated with @typing.runtime_checkable act as simple-minded runtime protocols that check only the presence of given attributes, ignoring their type signatures. Protocol classes can be generic, they are defined as:

class GenProto[T](Protocol):
    def meth(self) -> T:
        ...

P: float[source]

T: float[source]

reactant_gas: str[source]

carrier_gas: str[source]

flowtube.diffusion_coef.sigmas: dict[str, float][source]

flowtube.diffusion_coef.e_ks: dict[str, float][source]

flowtube.diffusion_coef.non_polar_Lennard_Jones_potential(e_k: float, T: float) → float[source]

Calculation of non-polar Lennard-Jones Potential for a binary gas mixture. Formulas 11-3.4 to 11-3.6 in Reid et al., 1987

Parameters:

e_k (float) – Lennard-Jones Energy (K).
T (float) – Temperature in K.

Returns:

Non-polar Lennard Jones potential.

Return type:

float

flowtube.diffusion_coef.binary_diffusion_coefficient(obj: required_attrs) → float[source]

Calculation of non-polar diffusion coefficient for a low pressure binary gas mixture. Supported gases: Ar, He, Air, Br2, Cl2, HBr, HCl, HI, H2O, I2, NO, N2, and O2. Formulas 11-3.1 to 11-3.2 in Reid et al., 1987

Parameters:

object (required_attrs) – Object with required attributes
Pa ((P in)
K (T in)
reactant_gas
carrier_gas).

Returns:

Diffusion coefficient for binary gas mixture (cm2 s-1)

Return type:

float