In this paper, a volume of fluid model is developed to simulate the vapor-liquid phase change in a modified solar still enhanced by a porous layer. The numerical results are compared with the experimental data to benchmark the accuracy of this model. Moreover, the results obtained by volume of fluid model are compared with the results of moist air model. It was found that the volume of fluid model predicts the experimental data with more accuracy in comparison with the moist air model. Finally, a comparison is performed between the conventional and modified solar stills to detect the ability of porous layer for improving the productivity of the solar still. It was concluded that the rates of evaporation and condensation for modified still with porous layer are improved. There is about 39% enhancement in the productivity when a sponge rubber porous layer with porosity of 0.4 is used in the basin of the solar still.

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