Compact Heat Exchangers and Enhancement Technology for the Process Industries - 2003

ISBN Print: 978-1-56700-195-2

PIV VISUALIZATIONS OF THE FLOW STRUCTURE UPSTREAM OF THE TUBES IN A TWO-ROW PLATE-FIN-AND-TUBE HEAT EXCHANGER

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DOI: 10.1615/978-1-56700-195-2.90
pages 63-68

M. Nacer-bey Ecole des Mines de Douai, Departement Energetique Industrielle, 941, rue Charles Bourseul, B.P. 838, 59508 DOUAI, cedex , France

S. Russeil Ecole des Mines de Douai, Departement Energetique Industrielle, 941, rue Charles Bourseul, B.P. 838, 59508 DOUAI, cedex, France

B. Baudoin Département Energétique Industrielle, Ecole des mines de Douai, 941, rue Charles Bourseul, B.P. 838, 59508 Douai Cedex, France

Abstract

The horseshoe vortex structure upstream of tubes in a two-row plate-fin-and-tube heat exchanger was visualized by means of a PIV system (Particle Image Velocimetry). The effect of the fin spacing and the flow velocity were both examined. Three fin spacings were tested for a Reynolds number, ReD, ranging from 280 to 1580. It was observed that the horseshoe vortex structure may form in one or two major vortices depending on the fin spacing and the flow velocity. Due to the development of the boundary layer on the fins, the horseshoe vortices upstream of the tubes of the second row are more noticeable than those upstream of the tubes of the first row.

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