Displacement of salty water by fresh water in the presence of Marangoni convection

This paper numerically investigates the interaction between the Marangoni c onvection, the double diffusive convection and the intrusion force a multi- cavity system. The model consists of a two-cavity rectangular system in whi ch the smaller cavity is located at the top left corner of the larger one. The larger cavity is filled with hot salty fluid while the smaller one cont ains cold fresh fluid. This problem is solved for the case of the fresh wat er intruding into the salty water. The interaction between the Marangoni (t hermal and solutal) and the double diffusive regimes is investigated, for d ifferent solutal Rayleigh number, in detail. Finite element modelling resul ts indicate that salinity induces stronger convection than the thermal ones and the thermal and solutal Marangoni convection further enhances the stre ngth of the cellular flow. Numerical results indicate that surface force sh ould be taken into consideration during the analysis and that the intruding force played an important role in the flow behaviour.