code: def calc_effective_conductivity(self, inlets=None, outlets=None,
                                      domain_area=None, domain_length=None):
          r
          return self._calc_eff_prop(inlets=inlets, outlets=outlets,
                                     domain_area=domain_area,
                                     domain_length=domain_length)
docs: r"""
          This calculates the effective electrical conductivity.
  
          Parameters
          ----------
          inlets : array_like
              The pores where the inlet voltage boundary conditions were
              applied.  If not given an attempt is made to infer them from the
              algorithm.
  
          outlets : array_like
              The pores where the outlet voltage boundary conditions were
              applied.  If not given an attempt is made to infer them from the
              algorithm.
  
          domain_area : scalar, optional
              The area of the inlet (and outlet) boundary faces.  If not given
              then an attempt is made to estimate it, but it is usually
              underestimated.
  
          domain_length : scalar, optional
              The length of the domain between the inlet and outlet boundary
              faces.  If not given then an attempt is made to estimate it, but it
              is usually underestimated.
  
          Notes
          -----
          The area and length of the domain are found using the bounding box
          around the inlet and outlet pores which do not necessarily lie on the
          edge of the domain, resulting in underestimation of sizes.