Investigation of the flow characteristics in a multirow finned-tube heat exchanger model by means of PIV measurements

被引：39

作者：

Tala, J. V. Simo ^{[1
,2
,3
]}

Russeil, S. ^{[1
,2
]}

Bougeard, D. ^{[1
,2
]}

Harion, J. -L. ^{[1
,2
]}

机构：

[1] Univ Lille Nord France, F-59000 Lille, France

[2] Mines Douai, EI, F-59500 Douai, France

[3] HEI, EEA Dept, F-59046 Lille, France

来源：

EXPERIMENTAL THERMAL AND FLUID SCIENCE | 2013年 / 50卷

关键词：

PIV; Multirow; Fin-and-tube; Heat exchanger; Horseshoe vortex system; HORSESHOE VORTEX SYSTEM; PLATE-FIN; BASE PLATE; CYLINDER;

D O I：

10.1016/j.expthermflusci.2013.05.003

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Multirow plain fin-and-tube heat exchangers (PFTHEs) are widely encountered in industrial processes. The airflow between the interfin spaces generates three-dimensional vortical structures at fin-tube junctions which increase local flow mixing. In this paper, two-components Pill velocity measurements were used to investigate the flow characteristics in a model of a four-row staggered PFTHE at Reynolds number Re-D = 2000. For each row, the flow structure was analyzed in radial planes at the fin-tube junction in order to characterize the spatial evolution of the vortical structures around the tube. These vortical structures generated in the vicinity of fin-tube junctions were visualized by analyzing the velocity gradient tensor and their spatial evolution and dissipation was characterized. This study highlights the complexity of both row-by-row and angular evolutions of the flow structure. Significant vorticity concentration was found in the vicinity of fin-tube junctions, in the flow core where horseshoe vortices develop. The maximum primary vortex strength throughout the heat exchanger model is observed at the second fin-tube junction. (c) 2013 Elsevier Inc. All rights reserved.

引用

页码：45 / 53

页数：9

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