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国际计算热科学期刊
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 0.7

ISSN 打印: 1940-2503
ISSN 在线: 1940-2554

国际计算热科学期刊

DOI: 10.1615/ComputThermalScien.2011003273
pages 445-459

A NEW METHOD TO SPECIFY THE OUTLET BOUNDARY CONDITION OF FLUID FLOW IN THE CHANNEL FORMED BY TUBE BANK FINS

Zhi-Min Lin
School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China
Liang-Bi Wang
School of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China; Key Laboratory of Railway Vehicle Thermal Engineering of MOE, Lanzhou Jiaotong University, Lanzhou, Gansu 730070, PR China
Quan-Fu Gao
Department of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou, Gansu 730070 P. R. China

ABSTRACT

The numerical treatment of the boundary conditions (BCs) in the computational domain is of paramount importance. In the passages formed by tube bank fins, a recirculation flow may occur at the outflow boundary. One of the conventional approaches to prescribe this kind BCs is to extend the computational domain far from the domain of interest, thus it waste the computing resource and lacks in a proper physical basis; while the convective boundary condition is somewhat difficult to implement and also lacks in a proper physical basis for elliptic-type problem. To find a more reasonable implement, firstly, the present study illustrates the quantitative similarities of the velocity components on those cross sections located at the periodic counterparts of the outflow boundary in the passages formed by the multi-row tube bank fins, and then a new method to specify the outlet flow BCs is introduced based on the quantitative similarities. If the proposed method is used, the simulation domain does not need to be extended and the possible recirculation flow at the outlet can be specified. The reliability of the proposed method is tested through comparing numerical results with experimental ones. The numerical results using the proposed and the conventional methods are also compared. The results show that the proposed method is feasible and can obtain reliable averaged characteristics with acceptable discrepancy.