年間 4 号発行
ISSN 印刷: 1065-3090
ISSN オンライン: 1940-4336
Indexed in
VISUALIZATION OF DEVELOPING SECONDARY FLOW PATTERNS IN THE HYDRODYNAMIC ENTRANCE REGION OF A CURVED PIPE
要約
Photographic results obtained by smoke injection method are presented for developing secondary flow patterns in the hydrodynamic entrance region of a curved pipe (pipe inside diameter d = 25.4 mm, radius of curvature R = 127 mm, and curvature ratio d/2R = 0.1) with fully developed parabolic entry velocity profile for the bend angles φ = 0, 15, 30, 45, 60, 90, 120, 135, and 180°. The Dean number and Reynolds number ranges are K = 91−653 and Re = 287−2,064, respectively. The characteristic features of the developing secondary flow patterns and some discrepancies between flow visualization results and the existing theoretical predictions are pointed out. Secondary flow separation phenomena near the inner wall are disclosed clearly by flow visualization. The present flow visualization study complements theoretical study.
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Kurokawa M., Cheng K. C., Shi L., Flow visualization of relaminarization phenomena in curved pipes and the related measurements, Journal of Visualization, 1, 1, 1998. Crossref