code: def expansion_max_H(self):
          Return the maximum distance between expansions for the largest
          allowable H/S ratio.
          :returns: Maximum expansion distance
          :rtype: float * meter
          Examples
          --------
          exp_dist_max(20*u.L/u.s, 40*u.cm, 37000, 25*u.degC, 2*u.m)
          0.375 meter
          """
          return (((self.BAFFLE_K / (2 * pc.viscosity_kinematic(self.temp) * (self.vel_grad_avg ** 2))) *
                  (self.Q * self.RATIO_MAX_HS / self.channel_W) ** 3) ** (1/4)).to(u.m)
docs: Return the maximum distance between expansions for the largest
          allowable H/S ratio.
          :returns: Maximum expansion distance
          :rtype: float * meter
          Examples
          --------
          exp_dist_max(20*u.L/u.s, 40*u.cm, 37000, 25*u.degC, 2*u.m)
          0.375 meter