Melting of cyclohexane-Cu nano-phase change material (nano-PCM) in porous medium under magnetic field

作者：Kohyani M Tahmasebi; Ghasemi B; Raisi A; Aminossadati S M

来源：Journal of the Taiwan Institute of Chemical Engineers, 2017, 77: 142-151.

DOI：10.1016/j.jtice.2017.04.037

• Melting
• Nano-PCM
• Porous medium
• Magnetic field
• Cavity

This paper presents a numerical study on the phase changing of cyclohexane-copper nano-PCM in a square porous cavity in the presence of a magnetic field. The horizontal walls of the cavity are insulated and its initial temperature is T-i. In the beginning, the temperature of the left vertical wall changes to a temperature higher than the melting point of nano-PCM. Four pertinent dimensionless parameters of porosity (epsilon), solid volume fraction (phi), Hartmann number (Ha) and Rayleigh number (Ra) are considered. The effects of these parameters on the flow and temperature fields, the heat transfer rate, and the melting time examined. The results show that changing the porosity has greater influence than changing the solid volume fraction on the melting time. The presence of an intensive magnetic field leads to a decrease in the melting time and prevail of the conductive heat transfer in the cavity. It changes the curvature of the melting line and converts it to a straight line being parallel to vertical walls of the cavity. As the Rayleigh number increases, the convection heat transfer becomes stronger and consequently, the melting speed in the cavity increases.

• 出版日期2017-8