Effects of Brownian motion on freezing of PCM containing nanoparticles

Abstract

Enhancement of thermal and heat transfer capabilities of phase change materials with addition of nanoparticles is reported. The mixed nanofluid of phase change material and nanoparticles presents a high thermal conductivity and low heat capacity and latent heat, in comparison with the base fluid. In order to present the thermophysical effects of nanoparticles, a solidification of nanofluid in a rectangular enclosure with natural convection induced by different wall temperatures is considered. The results show that the balance between the solidification acceleration by nanoparticles and slowing-down by phase change material gives rise to control the medium temperature. It indicates that this kind of mixture has great potential in various applications which requires temperature regulation. Also, the Brownian motion of nanoparticles enhances the convective heat transfer much more than the conductive transfer.

Thermodynamic study of the effects of nanoparticles on thermal origin: A review

“…It also includes mechanical properties as tensile strength, ductility, elasticity and flexibility, which are essential for their applications. Other properties such as suspension, settling, diffusion, hydrophobicity, and hydrophilicity have made the nanoparticles to find their way in numerous modern applications [35].…”

“…Nanoparticles exist in aquatic environments, having the ability to affect the chemistry of water and processes in various manners, to macro-sized counterparts, as they are mostly more reactive [32,33]. Due to their specific properties, they are considered as valuable materials, since they have significant economic potentials and benefits to both individuals and organisms [34,35].…”

Nano-engineered pathways for advanced thermal energy storage systems

“…The high thermal conductivity of the nanoparticles improves thermal conduction through the medium, while increasing the phase transition rate promotes convection. 101 On the contrary, particle rejection from the mushy region in solidification and development of a particle-rich layer in the surrounding fluid are key physical phenomena that are uniquely associated with particles in solidification regions. Nanoparticles influence phase change through these important phenomena.…”

Optimal Design of Nanoparticle Enhanced Phan-Thien–Tanner Flow of a Viscoelastic Fluid in a Microchannel

“…Heat transfer exchange in fluid flows [ 1 ] has numerous modern and common applications, including electronic cooling [ 2 ], mass transport [ 3 ], life [ 4 ], and cooling frameworks with phase change materials [ 5 ]. Conventional liquids, for example, water, oil, and glycols have poor heat transfer exchange because of their low heat transfer conductivities [ 6 ].…”

“…Nanofluids are drawing extraordinary intention with their tremendous potential to improve execution properties, particularly with the regard to warm exchange [ 7 ]. Nanofluids as a combination of metal, polymer, or metal oxide in a Newtonian liquid (mostly water or alcohol) present specific features in various fields of engineering [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ] and biology [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. In the field of heat transfer, the higher value of thermal conductivity in nanofluids provided by solid nanoparticles increases convective heat transfer in comparison with ordinary liquids.…”