CLOSED form expressions for the velocity, temperature and vapour mass fraction fields in the space bounded by two parallel vertical walls are found by solving the equations for a cuboid in the limit as the vertical and spanwise aspect ratios tend to infinity. The flow length scales are assumed to correspond to those of the cavity in the same direction; thus ruling out multicellular flows. The vertical walls are held at different constant temperatures and vapour mass fractions and are impermeable to the gas and nonslip.
This constitutes an exact solution of the system of equations derived in chapter 2, including the finite mass transfer effects of interfacial velocity and enthalpy interdiffusion.