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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.v5.i2.50
pages 141-154

VISUALIZATION OF THREE-DIMENSIONAL FLOW AROUND RIBS IN A DUCT

Karel Balatka
Tokyo University of Agriculture & Technology, Naka-cho 2-24-16, Koganei-shi, Tokyo 184-8588, Japan
Sadanari Mochizuki
Tokyo University of Agriculture and Technology, 2-24-16, Naka-cho, Koganei-shi, Tokyo 184, JAPAN
Akira Murata
Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan

ABSTRACT

The present study investigates the flow structures around one and two ribs mounted perpendicularly to the flow direction on the bottom of a square channel. The flow visualization is performed to shed some light on the complicated flow around such ribs and thus explain and support some of the results obtained during heat transfer investigation. Two techniques of flow visualization are used: dye injection and particle visualization. Experiments are performed for ribs with and without a gap between the side walls and the ribs. The Reynolds number ranges from Re = 500 to 2000. The results show strong three-dimensional flow structure due to the side-wall and gap influence. A heat transfer enchancement in the near-wall region—earlier found during the heat transfer investigation—is explained on the basis of the visualization results.