Thermo-fluidic characteristics of natural convection in honeycombs:The role of chimney enhancement  

作　　者：YANG XiaoHu YAN HongBin WANG WenBin JIN LiWen LU TianJian ICHIMIYA Koichi 

机构地区：[1]Department of Building Environment and Energy Engineering,School of Human Settlements and Civil Engineering,Xi'an Jiaotong University [2]MOE Key Laboratory for Multifunctional Materials and Structures,Xi'an Jiaotong University [3]School of Energy and Power Engineering,Xi'an Jiaotong University [4]State Key Laboratory for Strength and Vibration of Mechanical Structures,School of Aerospace,Xi'an Jiaotong University [5]Department of Mechanical Engineering,University of Yamanashi

出　　处：《Science China(Technological Sciences)》2015年第8期1318-1327,共10页中国科学（技术科学英文版）

基　　金：supported by the National 111 Project of China(Grant No.B06024);the National Basic Research Program of China("973"Project)(Grant No.2011CB610305);the National Natural Science Foundation of China(Grant No.51206128)

摘　　要：The natural convective heat transfer performance and thermo-fluidic characteristics of honeycombs with/without chimney extensions are numerically investigated.The present numerical simulations are validated by the purposely-designed experimental measurements on honeycombs with/without chimney.Good agreement between numerical simulation and experimental measurement is obtained.The influences of inclination angle and geometric parameters such as cell shape,streamwise and spanwise length are also numerically quantified.With the increment in inclination angle,the overall heat transfer rate decreases for the honeycombs with/without chimney.For honeycombs with the same void volume fraction but different cell shapes,there is little difference on the overall heat transfer rate.To enhance the natural convective heat transfer of honeycombs,these techniques including increasing the length of honeycomb in the streamwise/spanwise direction,increasing the thermal conductivity of hon-eycomb structure or adding a chimney extension may be helpful.

关 键 词：natural convection HONEYCOMB adiabatic chimney inclination angle 

分 类 号：TK124[动力工程及工程热物理—工程热物理] TQ639.3[动力工程及工程热物理—热能工程]