Akademik Veri Yönetim Sistemi
Journal of Engineering Research (Kuwait), 2025 (SCI-Expanded, Scopus)
Methods to improve phase transition dynamics of encapsulated PCMs are important for many energy systems such as solar power applications, building energy and heat exchangers. In the current study, effects of using wavy and rotating type partition on the phase change dynamics of a cavity–cavity unit are explored. Hybrid nanofluid is used in both units. For the wavy interface, waves of the triangular shape are taken into consideration with different wave numbers (N between 1 and 8) and wave amplitudes (A between 0.01H and 0.3H). When rotating interface is considered, different non-dimensional rotational speeds (Ω between 0 and 1000), the size of the rotating portion (Rc between 0.01H and 0.3H), and the vertical placement of the rotating interface (yc between 0.3H and 0.7H) are all taken into consideration. Near the interface of each cavity unit, using different partitions causes variations in the vortex pattern characteristics while phase change dynamics of corner mounted PCMs are altered. The highest process time values for left PCM (PCM1) and right PCM (PCM2) are obtained from almost flat type partitions as compared to a wavy one. When compared to the stationary case, rotation improves complete process time (tf) by about 8.5% for PCM1 and 13.5% for PCM2. The tf variation with rotating partition size for both PCMs approaches 27%. Process time variations for PCM1 and PCM2 are 15% and 8%, respectively, depending on the vertical placement of the rotating partition. In both partition cases, corner-mounted PCMs function better when nanofluid is utilized. Combining partition with nanofluid results in the shortest process time. The combined usage of rotating interface and nanofluid for PCM1 and PCM2 decreases process time by approximately 21.5% and 28% compared to the case of flat partition using only pure fluid.