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

作     者：Mohsen Izadi Mohsen Izadi

作者机构：Mechanical Engineering DepartmentFaculty of EngineeringLorestan UniversityKhorramabadIran 

出 版 物：《Chinese Journal of Chemical Engineering》 (中国化学工程学报（英文版）)

年 卷 期：2020年第28卷第5期

页      面：1203-1213页

核心收录：

学科分类：0710[理学-生物学] 0830[工学-环境科学与工程（可授工学、理学、农学学位）] 07[理学] 070205[理学-凝聚态物理] 0817[工学-化学工程与技术] 0703[理学-化学] 0702[理学-物理学] 

主　　题：Transient natural convection Mixture model Darcy-Brinlanan 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.