Abstract
Utilizing one triangular cold wall and one wavy adiabatic wall creates new container which is utilized in current modeling research. Inside the container is filled with water and to improve the solidification rate, nano-powders were added into PCM with low concentration. Unsteady process of freezing inside the domain was simulated based on Galerkin method and empirical data were utilized for verification. Concentration of nano-powder and its size were assumed as variables. Homogeneous formulation for NEPCM was utilized to involve the nanoparticle effects in governing equations. This process is mainly supported by conduction and existence of cold region at bottom side makes the impact of buoyancy negligible. With augmenting the concentration of copper oxide, the conductivity augments and speed of solid front increases and lower time needs for full freezing process. Size of nano-powders can affect the process because of its effect of feature of NEPCM. With rise of d(p), at first the conduction increases but further increment makes conduction becomes weaker due to sedimentation. When d(p) = 40 nm, increase of phi leads to reduction of time about 18.04%. With augment of d(p) from 30 for 40 and then 50 nm, the freezing time at first decreases about 20.01$ and then it augments about 35.48%. When phi = 0.04, d(p) = 40 nm, the fast process occurs and full solidification takes place after 457.60 s.