Effects of porous material on transient natural convection heat transfer of Nano-fluids inside a triangular chamber

This study numerically investigates the impact of porous materials, Nano-particle types, and their concentrations on transient natural convection heat transfer of Nano-fluid inside a porous chamber with a triangular section. The governing equations of the two-phase mixture model are separated on the computational domain and solved using the Finite Volume Method, taking into account the Darcy-Brinkman model for porous medium. It was observed that convection heat transfer inside the triangular chamber consists of three stages named initial, transient, semi-steady. The features of each step are provided in detail. The results suggested that use of a Hybrid Nano-fluid (water/aluminum oxide-cooper) inside a porous glass material and an increase in volume fraction of Nano-particles have adverse effects on heat transfer rate, In contrast as the Nano-particles volume fraction of the single Nano-fluid (water/aluminum oxide) inside the chamber increased, convection heat transfer rate improved. At the same time, it was observed that the use of both Nano-fluids (single and hybrid) in the porous environment of the aluminum foam could improve convection.Graphical Abstract
Source: Chinese Journal of Chemical Engineering - Category: Chemistry Source Type: research