ABSTRACT
Two-dimensional, steam and steam-air injection experiments were performed in unsaturated porous medium residually saturated with mesitylene. Injection of pure steam led to downward migration of separate phase whereas injection of steam-air resulted in total recovery in the gas phase. The performed experiments were successfully modeled with the numerical code T2VOC. Three mechanisms responsible for preventing downward migration were identified. The effectiveness of these mechanisms were all dependent on the mixing ratio of air to steam, but it will be difficult to give an estimate of the optimal mixing ratio in a given situation.
