Abstract
In this article, trapezoidal enclosure has been involved with applying three-lobed inner cold wall and finite element method was utilized in order to simulating this unsteady problem. The all walls except the vertical ones are cold and domain was full of liquid water. Inclusion of nano-powders was assumed as technique of accelerating the solidification in this article. Moreover, the efficacy of shape of alumina nano-powders on expedition of process has been simulated. As nanoparticles added to water, required time declines around 5.97 %. Also, change of particle style to platelet shape results in reduction of period of freezing around 11.56 %. The particles with higher m can affect freezing more about 2.5 % than that of m = 3. The quickest process takes 688.39 s to be completed when m = 5.7,phi = 0.04.