docs: def Yun_Heo_Kim(m, x, D, rhol, mul, 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 [2]_, and also reviewed in [3]_.
      
      Either the heat flux or excess temperature is required for the calculation
      of heat transfer coefficient. Uses liquid Reynolds number, Weber
      number, and Boiling number. Weber number is defined in terms of the velocity
      if all fluid were liquid.
  
      .. math::
          h_{tp} = 136876(Bg\cdot We_l)^{0.1993} Re_l^{-0.1626}
          
          Re_l = \frac{G D (1-x)}{\mu_l}
          
          We_l = \frac{G^2 D}{\rho_l \sigma}
      
      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]
      mul : float
          Viscosity of liquid [Pa*s]
      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. 
  
      Examples
      --------
      >>> Yun_Heo_Kim(m=1, x=0.4, D=0.3, rhol=567., mul=156E-6, sigma=0.02, Hvap=9E5, q=1E4)
      9479.313988550184
  
      References
      ----------
      .. [1] Yun, Rin, Jae Hyeok Heo, and Yongchan Kim. "Evaporative Heat 
         Transfer and Pressure Drop of R410A in Microchannels." International 
         Journal of Refrigeration 29, no. 1 (January 2006): 92-100. 
         doi:10.1016/j.ijrefrig.2005.08.005. 
      .. [2] Yun, Rin, Jae Hyeok Heo, and Yongchan Kim. "Erratum to 'Evaporative 
         Heat Transfer and Pressure Drop of R410A in Microchannels; [Int. J. 
         Refrigeration 29 (2006) 92-100]." International Journal of Refrigeration
         30, no. 8 (December 2007): 1468. doi:10.1016/j.ijrefrig.2007.08.003.
      .. [3] Bertsch, Stefan S., Eckhard A. Groll, and Suresh V. Garimella. 
         "Review and Comparative Analysis of Studies on Saturated Flow Boiling in
         Small Channels." Nanoscale and Microscale Thermophysical Engineering 12,
         no. 3 (September 4, 2008): 187-227. doi:10.1080/15567260802317357.
      '''
      G = m/(pi/4*D**2)
      V = G/rhol
      Rel = G*D*(1-x)/mul
      We = Weber(V=V, L=D, rho=rhol, sigma=sigma)
      if q:
          Bg = Boiling(G=G, q=q, Hvap=Hvap)
          return 136876*(Bg*We)**0.1993*Rel**-0.1626
      elif Te:
          A = 136876*(We)**0.1993*Rel**-0.1626*(Te/G/Hvap)**0.1993
          return A**(10000/8007.)
      else:
          raise Exception('Either q or Te is needed for this correlation')