On laminar convective cooling performance of hybrid water-based suspensions of A1_2O_3 nanoparticles and MEPCM particles in a circular tube

摘要

Laminar forced convection of a hybrid water-based suspension of AI_2O j nanoparticles and microencapsu-lated phase change material (MEPCM) particles through a circular tube was investigated experimentally. In addition, an integral energy balance with scaling estimation is presented to elucidate influences of thermal properties of the hybrid suspension on its internal convection effectiveness. Experimental results show considerable enhancement in cooling effectiveness of the hybrid suspension over the pure PCM suspension, nanofluid, or water. However, the convection efficacy of utilizing the hybrid suspension appears severely outweighed by pressure drop penalty from its drastically increased viscosity with respect to the pure PCM suspension or the pure nanofluid.