The HardSphere class, found in pykingas/HardSphere.py, inherrits from the py_KineticGas class, and is the interface to the RET-HS Model. This class implements utility methods to access mixing parameters etc.

Table of contents

• Constructor
  • __init__
• Utility methods
  • get_Eij

Constructor

Methods to initialise RET-HS model.

Table of contents

• Constructor
  • __init__

__init__(self, comps, mole_weights=None, sigma=None, N=4, is_idealgas=False, parameter_ref='default')

If parameters are explicitly supplied through optional arguments, these will be used instead of those in the database. To supply specific parameters for only some components, give None for the components that should use the database value

Args:

     comps (str) :

          Comma-separated list of components

     mole_weights (1D array) :

          Molar weights [g/mol]

     sigma (1D array) :

          hard-sphere diameters [m]

     parameter_ref (str) :

          Id for parameter set to use

Utility methods

Set- and get methods for interaction parameters, mixing parameters …

Table of contents

• Utility methods
  • get_Eij

get_Eij(self, Vm, T, x)

Compute the factors

\[( n_i / k_B T ) (d \mu_i / d n_j)_{T, n_{k \neq j}},\]

where $n_i$ is the molar density of species $i$.

Args:

     Vm (float) :

          Molar volume [m3 / mol]

     T (float) :

          Temperature [K]

     x (array_like) :

          Molar composition

Returns:

     (2D array) :

          The factors E[i][j] = $ ( n_i / k_B T ) (d \mu_i / d n_j){T, n{k \neq j}}$, where $n_i$is the molar density of species $i$. Unit [1 / mol]