Electrically heated tobacco products have been rapidly developed for their advantage of having less harmful substances due to evaporation at low temperature. To investigate the evaporation mechanism in the porous tobacco segment, an evaporation heat transfer computational model based on the Eulerian-VOF method was established, and the effects of capillary forces and diffusion of different components were studied by coupling the species transport model with the Skjaeveland capillary model. Based on established model, the numerical simulation for the evaporation process of binary mixtures (water-glycerol) in the porous domain of the tobacco section of heated tobacco product was performed. The variation of temperature and velocity distribution under different porosity and heating power were compared. The results showed that, with the heating process, the surface temperature in the single-phase region first increased linearly, then the slope increased sharply after exceeding the saturation temperature, and then gradually cooled to reach a stable temperature. With the increase of porosity, the heating rate of the porous surface in the single-phase region slowed down, and the onset of boiling was delayed. In addition, the maximum temperature and stable temperature increased with the increase in porosity. The heating power is dominant in the early stage of evaporation, while the later stage of evaporation is more influenced by the parameters of the porous structure. Therefore, with the increase of heating power, the heating rate of surface in the single-phase region is accelerated and the maximum temperature is also increased. However, the stable temperature and the final liquid-vapor interface basically follow the same trend.