This paper presents the melting process of immiscible binary phase change materials (PCMs) in a rectangular enclosure which was subjected to isothermal heating from one vertical wall at 60 °C. Ice and oleic acid (OA) were selected as polar and nonpolar PCMs, respectively, resulting in immiscibility between the two materials. Initially, the melting process of each PCM was separately studied. Afterward, the melting process of the lighter density material (OA) placed on the denser material (ice) was investigated. In this case, there was no displacement between two materials. Then, the cases were studied in which ice was placed on top of OA with various volumetric ratios. The displacement effects of these two materials due to density difference on the stored heat and melting time were evaluated. Results indicated that when OA was placed on top of ice with volumetric ratio of 50, the melting time was the lowest compared to those of other binary PCMs. Moreover, the melting fraction variation of water and OA during the time was obtained. Accordingly, the stored energy and Nusselt number were calculated for different cases.
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