jaxprop.perfect_gas.perfect_gas module#
- class jaxprop.perfect_gas.perfect_gas.FluidPerfectGas(name, T_ref=300.0, p_ref=101325.0, identifier=None)[source]#
Bases:
Module- Attributes:
- fluid_name
- identifier
Methods
get_state(input_pair, x, y)Evaluate thermodynamic state for a perfect gas.
- constants: PerfectGasConstants#
- fluid_name: str = None#
- get_state(input_pair: str, x: float, y: float)[source]#
Evaluate thermodynamic state for a perfect gas.
- identifier: str = None#
- class jaxprop.perfect_gas.perfect_gas.PerfectGasConstants(R: jax.Array, gamma: jax.Array, T_ref: jax.Array, P_ref: jax.Array, s_ref: jax.Array, k_ref: jax.Array, mu_ref: jax.Array, S_k: jax.Array, S_mu: jax.Array)[source]#
Bases:
Module- P_ref: Array#
- R: Array#
- S_k: Array#
- S_mu: Array#
- T_ref: Array#
- gamma: Array#
- k_ref: Array#
- mu_ref: Array#
- s_ref: Array#
- jaxprop.perfect_gas.perfect_gas.estimate_sutherland_constant(T1, mu1, T2, mu2)[source]#
Estimate the Sutherland constant [K] from two values of a transport property (viscosity or thermal conductivity) at two temperatures, assuming a Sutherland-like law:
mu(T) = mu_ref * (T / T_ref)^{3/2} * (T_ref + S) / (T + S)
- Parameters:
- T1, T2float
Temperatures in kelvin [K].
- mu1, mu2float
Transport property values at T1 and T2 (e.g. viscosity in Pa·s or conductivity in W/m·K).
- Returns:
- float
Estimated Sutherland constant in kelvin [K].
- jaxprop.perfect_gas.perfect_gas.get_constants(fluid_name, T_ref, p_ref, dT=100.0)[source]#
Compute perfect-gas constants from a real-fluid model at a reference state, and estimate Sutherland constants using offset temperatures.
- Parameters:
- fluid_namestr
Name of the fluid (passed to CoolProp).
- T_reffloat
Reference temperature in kelvin [K].
- P_reffloat
Reference pressure in pascal [Pa].
- dTfloat, optional
Temperature offset used to evaluate mu and k at T_ref ± dT for Sutherland constant estimation [K]. Default is 100.0.
- Returns:
- GasConstants
An Equinox module containing the perfect-gas constants: - R : specific gas constant [J/(kg·K)] - gamma : specific heat ratio [-] - T_ref : reference temperature [K] - P_ref : reference pressure [Pa] - s_ref : reference entropy [J/(kg·K)] - mu_ref : dynamic viscosity at T_ref [Pa·s] - S_mu : Sutherland constant for viscosity [K] - k_ref : thermal conductivity at T_ref [W/(m·K)] - S_k : Sutherland constant for thermal conductivity [K]
- Raises:
- ValueError
If required properties are missing or invalid.
- ZeroDivisionError
If the Sutherland estimation becomes numerically unstable.