This work focuses on heat and mass transfers with phase change in porous media. The experimental analysis was carried out in an aerodynamic return-flow wind tunnel, with very small cylinders of cellular concrete. For the local analysis, the samples were fitted with thermocouples and pressure sensors. A method of temperature and pressure field visualization is developed to highlight the dynamics of transport phenomena. We show two specific phenomena: (1) liquid outflow generated by the overpressure and (2) vaporization of the water inside a two-phase zone that progressively pervades the sample.