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Journal of Flow Visualization and Image Processing

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

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v12.i3.60
pages 301-311

FLOW STRUCTURE IN CIRCULAR TUBES WITH SEGMENTAL BAFFLES

Mushtak Al-Atabi
Mechanical Engineering Department, University of Sheffield, Sheffield S1 3JD, UK
S. B. Chin
Mechanical Engineering Department, University of Sheffield, Sheffield S1 3JD, UK
Xiao Yu Luo
Department of Mathematics, University of Glasgow, Glasgow, UK

ABSTRACT

The flow structure in a circular uniform-diameter tube with segmental baffles is experimentally investigated over the range of Reynolds numbers from 50 to 5000, using flow visualization and pressure drop measurement. Three baffle clearance ratios (c/D = 0.3, 0.5, and 0.7) are studied. The results revealed that the presence of the baffles triggers transition to turbulence at a much lower Reynolds number compared to that for the straight circular tube. The flow in the baffle section of tube with c/D = 0.3 appears turbulent at the Reynolds number of 250. Friction factor of the tubes with baffles decreases with increasing Reynolds number but it is always larger than that for a laminar flow in a tube without baffles.