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

doi:10.1016/j.cjche.2020.01.021

Abstract

Abstract: 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, and semi-steady. The features of each step are provided in detail. The results suggested that the 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-particle 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.

Key words: Transient natural convection, Mixture model, Darcy-Brinkman model, Rayleigh-Benard instability, Triangular chamber

摘要： 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, and semi-steady. The features of each step are provided in detail. The results suggested that the 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-particle 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.

关键词: Transient natural convection, Mixture model, Darcy-Brinkman model, Rayleigh-Benard instability, Triangular chamber

Mohsen Izadi. Effects of porous material on transient natural convection heat transfer of nano-fluids inside a triangular chamber[J]. Chinese Journal of Chemical Engineering, 2020, 28(5): 1203-1213.

Mohsen Izadi. Effects of porous material on transient natural convection heat transfer of nano-fluids inside a triangular chamber[J]. 中国化学工程学报, 2020, 28(5): 1203-1213.

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