Natural convection from a bottom heated of an asymmetrical U-shaped enclosure with nano-encapsulated phase change material

• Main Authors: Saleh, H., Siri, Zailan, Ghalambaz, M.
• Format: Article
• Published: Elsevier 2021
• Subjects: QA Mathematics
• Online Access: http://eprints.um.edu.my/27190/
• Institution: Universiti Malaya

In the current study, free convection of a hybrid nanofluid in asymmetrical U-shaped enclosure is studied numerically. The bottom plate is heated and the top U-shaped walls is cooled, while the other walls are insulated. The cold basin moves along the horizontal centerline that measure the asymmetrically shape. The hybrid nanofluid is formed of a phase-change material (PCM) suspended in the water. The PCM utilize polyurethane as the protective case and nonadecane inside. The core absorb or release thermal energy in the shape of latent heat. The nanoparticle concentration, asymmetrical parameter, aspect ratio, fusion temperature and Rayleigh number have been investigated in detail. The results shows that the global heat transfer performance can be enhanced more than 9% by adding 1% nano-capsules volume fraction. Symmetry U-shaped does not give the maximum heat transfer performance and changing the basin location has small effect the heat transfer enhancement at moderate aspect ratio and fusion temperature.