Freezing of water within heat storage container with involve of nanoparticles

Abstract

In this study, the influence of inclusion of alumina nanoparticles with various size and concentration on treatment of solidification of water has been analyzed. To reach the new properties of working material, formulations based on single phase methodology was utilized and effect of size of particles were incorporated in estimating the conductivity of NEPCM. Galerkin method was implemented for solving the mathematic model which contains two equations with neglecting the buoyancy term. Grid style changes with changing the time stage and such adaptive grid results in more accurate outputs. Validation based on previous benchmark study shows good agreement and it proves the utilized assumptions are reasonable. As nanoparticles add the freezing time declines around 41.14% because of stronger conduction mode. Besides, changing the concentration of alumina from 0.02 to 0.04 makes the rate of freezing to intensify around 19.36%. As diameter of particles intensifies up to 40 nm, the freezing speed augments around 19.93% but augmenting dp from 40 to 50 nm causes the this factor to decline around 49.12%.