docs: def Akers_Deans_Crosser(m, rhog, rhol, kl, mul, Cpl, D, x):
      r'''Calculates heat transfer coefficient for condensation
      of a pure chemical inside a vertical tube or tube bundle, as presented in
      [2]_ according to [1]_.
  
      .. math::
          Nu = \frac{hD_i}{k_l} = C Re_e^n Pr_l^{1/3}
          
          C = 0.0265, n=0.8 \text{ for } Re_e > 5\times10^4
          
          C = 5.03, n=\frac{1}{3} \text{ for } Re_e < 5\times10^4
  
          Re_e = \frac{D_i G_e}{\mu_l}
          
          G_e = G\left[(1-x)+x(\rho_l/\rho_g)^{0.5}\right]
          
      Parameters
      ----------
      m : float
          Mass flow rate [kg/s]
      rhog : float
          Density of the gas [kg/m^3]
      rhol : float
          Density of the liquid [kg/m^3]
      kl : float
          Thermal conductivity of liquid [W/m/K]
      mul : float
          Viscosity of liquid [Pa*s]
      Cpl : float
          Constant-pressure heat capacity of liquid [J/kg/K]
      D : float
          Diameter of the tubing [m]
      x : float
          Quality at the specific interval [-]
  
      Returns
      -------
      h : float
          Heat transfer coefficient [W/m^2/K]
  
      Notes
      -----
  
      Examples
      --------
      >>> Akers_Deans_Crosser(m=0.35, rhog=6.36, rhol=582.9, kl=0.098, 
      ... mul=159E-6, Cpl=2520., D=0.03, x=0.85)
      7117.24177265201
  
      References
      ----------
      .. [1] Akers, W. W., H. A. Deans, and O. K. Crosser. "Condensing Heat 
         Transfer Within Horizontal Tubes." Chem. Eng. Progr. Vol: 55, Symposium 
         Ser. No. 29 (January 1, 1959).
      .. [2] Kakaç, Sadik, ed. Boilers, Evaporators, and Condensers. 1st. 
         Wiley-Interscience, 1991.
      '''
      G = m/(pi/4*D**2)
      Ge = G*((1-x) + x*(rhol/rhog)**0.5)
      Ree = D*Ge/mul
      Prl = mul*Cpl/kl
      if Ree > 5E4:
          C, n = 0.0265, 0.8
      else:
          C, n = 5.03, 1/3.
      Nu = C*Ree**n*Prl**(1/3.)
      return Nu*kl/D