docs: def Li_Wu(m, x, D, rhol, rhog, mul, kl, Hvap, sigma, q=None, Te=None):
      r'''Calculates heat transfer coefficient for film boiling of saturated
      fluid in any orientation of flow. Correlation
      is as shown in [1]_, and also reviewed in [2]_ and [3]_.
      
      Either the heat flux or excess temperature is required for the calculation
      of heat transfer coefficient. Uses liquid Reynolds number, Bond number,
      and Boiling number.
      
      .. math::
          h_{tp} = 334 Bg^{0.3}(Bo\cdot Re_l^{0.36})^{0.4}\frac{k_l}{D}
          
          Re_{l} = \frac{G(1-x)D}{\mu_l}
      
      Parameters
      ----------
      m : float
          Mass flow rate [kg/s]
      x : float
          Quality at the specific tube interval []
      D : float
          Diameter of the tube [m]
      rhol : float
          Density of the liquid [kg/m^3]
      rhog : float
          Density of the gas [kg/m^3]
      mul : float
          Viscosity of liquid [Pa*s]
      kl : float
          Thermal conductivity of liquid [W/m/K]
      Hvap : float
          Heat of vaporization of liquid [J/kg]
      sigma : float
          Surface tension of liquid [N/m]
      q : float, optional
          Heat flux to wall [W/m^2]
      Te : float, optional
          Excess temperature of wall, [K]
  
      Returns
      -------
      h : float
          Heat transfer coefficient [W/m^2/K]
  
      Notes
      -----
      [1]_ has been reviewed. 
      
      [1]_ used 18 sets of experimental data to derive the results, covering 
      hydraulic diameters from 0.19 to 3.1 mm and 12 different fluids.
  
      Examples
      --------
      >>> Li_Wu(m=1, x=0.2, D=0.3, rhol=567., rhog=18.09, kl=0.086, mul=156E-6, sigma=0.02, Hvap=9E5, q=1E5)
      5345.409399239493
  
      References
      ----------
      .. [1] Li, Wei, and Zan Wu. "A General Correlation for Evaporative Heat 
         Transfer in Micro/mini-Channels." International Journal of Heat and Mass
         Transfer 53, no. 9-10 (April 2010): 1778-87. 
         doi:10.1016/j.ijheatmasstransfer.2010.01.012.
      .. [2] Fang, Xiande, Zhanru Zhou, and Dingkun Li. "Review of Correlations 
         of Flow Boiling Heat Transfer Coefficients for Carbon Dioxide."
         International Journal of Refrigeration 36, no. 8 (December 2013): 
         2017-39. doi:10.1016/j.ijrefrig.2013.05.015.
      .. [3] Kim, Sung-Min, and Issam Mudawar. "Review of Databases and 
         Predictive Methods for Pressure Drop in Adiabatic, Condensing and 
         Boiling Mini/micro-Channel Flows." International Journal of Heat and 
         Mass Transfer 77 (October 2014): 74-97. 
         doi:10.1016/j.ijheatmasstransfer.2014.04.035.
      '''
      G = m/(pi/4*D**2)
      Rel = G*D*(1-x)/mul
      Bo = Bond(rhol=rhol, rhog=rhog, sigma=sigma, L=D)
      if q:
          Bg = Boiling(G=G, q=q, Hvap=Hvap)
          return 334*Bg**0.3*(Bo*Rel**0.36)**0.4*kl/D
      elif Te:
          A = 334*(Bo*Rel**0.36)**0.4*kl/D
          return A**(10/7.)*Te**(3/7.)/(G**(3/7.)*Hvap**(3/7.))
      else:
          raise Exception('Either q or Te is needed for this correlation')