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

Том 3, Выпуск 6, 2011, pp. 445-459

DOI: 10.1615/ComputThermalScien.2011003273

Get access

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

Краткое описание

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.

Ключевые слова: outlet boundary condition, laminar convective heat transfer, tube bank fin heat exchanger, numerical simulation

ЦИТИРОВАНО В

Hu Wanling, Su Mei, Wang Liangcheng, Zhang Qiang, Chang Limin, Liu Song, Wang Liangbi, The optimum fin spacing of circular tube bank fin heat exchanger with vortex generators, Heat and Mass Transfer, 49, 9, 2013. Crossref
Hu Wan-Ling, Song Ke-Wei, Guan Yong, Chang Li-Min, Liu Song, Wang Liang-Bi, Secondary flow intensity determines Nusselt number on the fin surfaces of circle tube bank fin heat exchanger, International Journal of Heat and Mass Transfer, 62, 2013. Crossref
Lin Zhi-Min, Wang Liang-Bi, Zhang Yong-Heng, Numerical study on heat transfer enhancement of circular tube bank fin heat exchanger with interrupted annular groove fin, Applied Thermal Engineering, 73, 2, 2014. Crossref
Gong Bao, Wang Liang-Bi, Lin Zhi-Min, Heat transfer characteristics of a circular tube bank fin heat exchanger with fins punched curve rectangular vortex generators in the wake regions of the tubes, Applied Thermal Engineering, 75, 2015. Crossref
Lin Zhi-Min, Liu Cai-Ping, Lin Mei, Wang Liang-Bi, Numerical study of flow and heat transfer enhancement of circular tube bank fin heat exchanger with curved delta-winglet vortex generators, Applied Thermal Engineering, 88, 2015. Crossref
Lin Zhi-Min, Wang Liang-Bi, A Multi-Domain Coupled Numerical Method for a Flat Tube Bank Fin Heat Exchanger with Delta-Winglet Vortex Generators, Numerical Heat Transfer, Part A: Applications, 65, 12, 2014. Crossref
Liu Cai-Ping, Lin Zhi-Min, Wang Liang-Bi, Thermal Boundary Conditions on the Cross Sections Normal to the Main Flow of a Fully Developed Convection in a Tube with Tape Insert, Numerical Heat Transfer, Part A: Applications, 65, 12, 2014. Crossref
Hu Wanling, Wang Liangbi, Guan Yong, Hu Wenju, The effect of shape of winglet vortex generator on the thermal–hydrodynamic performance of a circular tube bank fin heat exchanger, Heat and Mass Transfer, 53, 9, 2017. Crossref
Lin Zhi-Min, Li Sheng-Fan, Liu Cai-Ping, Wang Liang-Bi, Zhang Yong-Heng, Thermal and flow characteristics of a channel formed by aligned round tube bank fins stamped with curve delta-winglet vortex generators, Thermal Science and Engineering Progress, 26, 2021. Crossref
Gao Quanfu, Ma Sen, Numerical Simulation on Characteristics of Heat Transfer with Different Elliptic Tube Cross Sections, Journal of Physics: Conference Series, 1622, 1, 2020. Crossref
Lin Zhimin, Wang Zhaocheng, Li Sha, Wang Liangbi, Zhang Yongheng, Wang Weiwei, He Jing, Heat transfer augmentation characteristics of a fin punched with curve trapezoidal vortex generators at the rear of tubes, Thermal Science, 26, 4 Part B, 2022. Crossref