docs: def Nusselt_laminar(Tsat, Tw, rhog, rhol, kl, mul, Hvap, L, angle=90.):
      r'''Calculates heat transfer coefficient for laminar film condensation
      of a pure chemical on a flat plate, as presented in [1]_ according to an
      analysis performed by Nusselt in 1916.
  
      .. math::
          h=0.943\left[\frac{g\sin(\theta)\rho_{liq}(\rho_l-\rho_v)k_{l}^3
          \Delta H_{vap}}{\mu_l(T_{sat}-T_w)L}\right]^{0.25}
  
      Parameters
      ----------
      Tsat : float
          Saturation temperature at operating pressure [Pa]
      Tw : float
          Wall temperature, [K]
      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]
      Hvap : float
          Heat of vaporization of the fluid at P, [J/kg]
      L : float
          Length of the plate [m]
      angle : float, optional
          Angle of inclination of the plate [degrees]
  
      Returns
      -------
      h : float
          Heat transfer coefficient [W/m^2/K]
  
      Notes
      -----
      Optionally, the plate may be inclined.
      The constant 0.943 is actually:
      
      .. math::
          2\sqrt{2}/3
  
      Examples
      --------
      p. 578 in [1]_, matches exactly.
  
      >>> Nusselt_laminar(Tsat=370, Tw=350, rhog=7.0, rhol=585., kl=0.091,
      ... mul=158.9E-6, Hvap=776900, L=0.1)
      1482.206403453679
  
      References
      ----------
      .. [1] Hewitt, G. L. Shires T. Reg Bott G. F., George L. Shires, and
         T. R. Bott. Process Heat Transfer. 1E. Boca Raton: CRC Press, 1994.
      '''
      return 2.*2.**0.5/3.*(kl**3*rhol*(rhol - rhog)*g*sin(angle/180.*pi)
                            *Hvap/(mul*(Tsat - Tw)*L))**0.25