Development, calibration and validation of a mathematical model for the low-pressure-vaporization of the water in porous media

摘要: Abstract This paper reports the development, calibration and validation of a mathematical model low-pressure-vaporization process in different types porous media. aims to improve models developed by other authors this area, namely considering some aspects that have not been addressed, such as: vapor pressure is equal whole chamber; interfacial saturation pressure; surroundings significant influence on vaporization phenomena all zones media; first stage characterized only diffusion vaporization. For purpose, an experimental procedure was made involving definition several LPV parameters: coefficient medium ePM, at liquid–vapor interface within ei,PM, free surface Pv,FS, layer Pv,FL, Pv,i, volume VVL VFL. These parameters were represented set multivariable functions determined from series experiments media, each one initial water temperature. Thus, work enhanced physical media proposed, concerning two distinct stages. The set-up comprises main components: vacuum chamber (VC) depressurization system (DS). Part VC occupied open container for which isolated walls. results obtained show through good agreement with (e.g., R2 varies 0.9581–0.9903) also parameter describes well regimes second process. importance capillary effect tension forces superheating degree and, consequently, evolution demonstrated, as amount initially contained medium. From based measured temperature evolutions, deviations ±5% are found, confirm between simulated values. it possible conclude calibrated reference various studies applications.