Heat transfer investigation of nano - Encapsulated phase change materials (NEPCMs) in a thermal energy storage device

Phase change natural convection heat transport and flow features of a variety and new types of hybrid nanoliquids, suspension of Nano - encapsulated phase change materials (NEPCMs), within a square cavity is inspected theoretically in this analysis. The capsules are arranged with a shell and a PCM as a core. The shell of this NEPCM prevents the phase change material from the direct interaction of hot fluid and from the leakage. The heat capacity of the suspension contains latent heat generated at the time of phase change. The modeled equations are numerically scrutinized with Finite element method. Variable thermal conductivity parameter (1 <= Nc <= 5), variable viscosity parameter (1 <= Nv <= 5), radiation number (0.5 >= R >= 0.1), Rayleigh parameter ( 102 <= Ra <= 103), volume fraction of NEPCMs (1% <= phi <= 5%) and fusion temperature (0.2 <= theta f <= 1.0) impact on the patterns of heat capacity ratio, isotherms and velocity lines are examined in detail. The results indicates that, as the volume fraction values of NEPCMs amplifies from 1% to 5% the rates of heat transfer of the nanoliquid magnifies 42% compared to the host fluid. Non - dimensional rates of heat transport magnifies with growing (Ste) values.