Numerical investigations of unconstrained melting of nano-enhanced phase change material (NEPCM) inside a spherical container

► The paper studied unconstrained melting inside a sphere with nano-enhanced phase change material (NEPCM). ► The NEPCM comprises paraffin wax as base material and copper particles as nano-particles. ► Numerical simulations are done at three different Stefan number and volume fraction of nano-particles. ► Simulation results show the enhancement in thermal conductivity of NEPCM causes a higher melting rate.