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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

ISSN Print: 1065-3090
ISSN Online: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v17.i4.30
pages 309-320

FLOW VISUALIZATION USING HYDROGEN BUBBLE TECHNIQUE OF A FIN-AND-TUBE TYPE HEAT EXCHANGER WITH PUNCHED-OUT VORTEX GENERATORS

M. Mustafa Akbari
Department of Mechanical Systems Engineering, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Japan
Akira Murata
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
Sadanari Mochizuki
Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei-shi, Tokyo 184, JAPAN
Kaoru Iwamoto
Department of Mechanical Engineering, Tokyo University of Science, Noda-shi, Chiba 278-8510; Department of Mechanical System Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
Hiroshi Saito
Mechanical Systems Engineering Course, Tokyo Metropolitan College of Industrial Technology, 1-10-40 Higashi-Ohi, Shinagawa, Tokyo 140-0011, Japan

ABSTRACT

A study of the flow structure inside a fin-and-tube heat exchanger was performed by using hydrogen bubble visualization technique to examine the effects of different vortex generator geometries on the flow field, understand the formation of vortices and identify the punched-out hole effect on the flow behavior. Flow visualization results clarified flow structures and the effect of the punched holes for the studied vortex generator configurations. It is found that the vortices are created in the installed or punched forms. The strength of the vortices of installed vortex generators is more prominent compared to that of the punched vortex generators but the punched vortex generators showed smaller friction factors compared to the installed vortex generators.