Experimental investigation of chimney-enhanced natural convection in hexagonal honeycombs  

作　　者：Xiaohu Yang Jiaxi Bai Tianjian Lu Tongbeum Kim 

机构地区：[1]School of Energy and Power Engineering, Xi’an Jiaotong University [2]State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi’an Jiaotong University [3]School of Mechanical Engineering, University of the Witwatersrand, Johannesburg,Wits 2050, South Africa

出　　处：《Theoretical & Applied Mechanics Letters》2014年第3期49-54,共6页力学快报（英文版）

基　　金：supported by the National 111 Project of China(B06024);the National Basic Research Program of China(2011CB610305);the National Natural Science Foundation of China(51206128)

摘　　要：The natural convective heat transfer performance of an aluminum hexagonal honeycomb acting as a novel heat sink for LED cooling is experi- mentally investigated. The concept of adding an adiabatic square chimney ex- tension for heat transfer enhancement is proposed, and the effects of chimney shape, height, and diameter are quantified. The average Nuav of a heated hon- eycomb with straight chimney is significantly higher than that without chimney, and the enhancement increases with increasing chimney height. At a given chim- ney height, honeycombs with divergent chimneys perform better than those with convergent ones. For a fixed divergent angle, the Nuav number increases mono- tonically with increasing chimney height. In contrast, with the convergent angle fixed, there exists an optimal chimney height to achieve maximum heat transfer.The natural convective heat transfer performance of an aluminum hexagonal honeycomb acting as a novel heat sink for LED cooling is experi- mentally investigated. The concept of adding an adiabatic square chimney ex- tension for heat transfer enhancement is proposed, and the effects of chimney shape, height, and diameter are quantified. The average Nuav of a heated hon- eycomb with straight chimney is significantly higher than that without chimney, and the enhancement increases with increasing chimney height. At a given chim- ney height, honeycombs with divergent chimneys perform better than those with convergent ones. For a fixed divergent angle, the Nuav number increases mono- tonically with increasing chimney height. In contrast, with the convergent angle fixed, there exists an optimal chimney height to achieve maximum heat transfer.

关 键 词：natural convection HONEYCOMB adiabatic chimney experiment 

分 类 号：O355[理学—流体力学]