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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN Imprimir: 1065-3090
ISSN En Línea: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v2.i1.10
pages 1-13

VISUALIZATION OF DEVELOPING SECONDARY FLOW PATTERNS IN THE HYDRODYNAMIC ENTRANCE REGION OF A CURVED PIPE

K. C. Cheng
Department of Mechanical Engineering, University of Alberta Edmonton, Canada
Masao Takuma
Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8
Yoshiyuki Kamiya
Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 2G8

SINOPSIS

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.