Natural convection

A method to determine the critical concentration Rayleigh number in isothermal membrane transport processes was worked out. This method is based on equations which include the diffusive permeability coefficient, Tks; solution parameters (density, D; kinematic viscosity, <; diffusion coefficient, Dks

The evaporation of a thin liquid film flowing down on the internal face of one plate of a vertical channel is studied. The wet plate is subjected to a uniform heat flux while the second plate is taken isothermal and impermeable. The governing equations in the liquid and in the gas regions with the b