Magnetic force impact on melting behavior of dilatant non-Newtonian phase change materials using a numerical approach

Abstract

This work proposes to explore how heat is transferred during melting dilatant non-Newtonian behaviour phase change materials (PCM) containing magnetic and ferro-hydrodynamic components in a differentially heated cavity. A dilatant non-Newtonian nano-encapsule phase change material (NEPCM) is used to fill the cavity, and a non-homogeneous magnetic field is placed around the heated wall. With the finite element method, equations are converted to a non-dimensional form in which solutions are found. A meshing deformation technique is used to trace the interface between the solid and liquid portions of the model. The findings of the grid research were compared to different studies in the literature and found to be in excellent accord. This study is dedicated to analyzing the phase change heat transfer and melting front effects of the power-law index (n = 1.1–1.5) and changeable parameters such as Rayleigh number (Ra = 103–106), Hartmann number (Ha = 0–200), and magnetic parameter (Mnf = 0–9000). The results demonstrate that increasing the Hartmann number decreases the melting process and increasing the magnetic parameter increases the melting process and the melting front becomes very non-linear as it gets to the cold wall. In addition, in research, it has been found that shear thickening fluids exhibit greater cooling capability. Finally, the average Nusselt number decreases with an increase in the non-Newtonian's index n and Hartmann number but increases with an increase in the magnetic parameter.

Keywords

• Melting
• PCM
• Dilatant non-Newtonian
• Magnetic force
• Nano-encapsulate