LuWang1,3, Xin Lu1,3, Xiao-Jing Ma1,3, Tian-PengWang2,3, and Liang-BiWang This email address is being protected from spambots. You need JavaScript enabled to view it.1,3

1School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China
2School of Architecture and Urban Planning, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China
3Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, China


 

Received: June 7, 2022
Accepted: July 23, 2022
Publication Date: September 15, 2022

 Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.


Download Citation: ||https://doi.org/10.6180/jase.202306_26(6).0008  


ABSTRACT


The heat transfer characteristics of the wall formed by the aluminum extrusion and multi insulation material layers are studied experimentally and numerically. The experimental results show that the equivalent thermal conductivity of the wall does not depend on the temperature difference and its position regarding to the gravity direction. These results indicate that the roles of the natural convection and the radiation heat transfer in the aluminum extrusion are very weak, which are confirmed by the numerical results. The numerical results show that the aluminum extrusion formed by the aluminum tape with thickness less than 5% of the wall thickness transfers more than 99% of the total heat transferred through the combined layer. As resulting, a more uniform temperature distribution is obtained on the surface in contact with the air in the aluminum extrusion. The results suggest that the natural convection and heat radiation in the combined layer can be safely ignored.


Keywords: Heat transfer, Natural convection, Radiation heat transfer, Equivalent thermal conductivity, The layer formed by aluminum extrusion and insulation layers


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