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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


11 pages

PIV MEASUREMENTS OF DUCT FLOW WITH A DETACHED TURBULATOR ARRAY

Tong-Miin Liou
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 407, ROC
Shun-Nan Liou
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 30013, ROC
K. H. Chang
Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan 30013, Republic of China

ABSTRACT

Measurements of instantaneous velocity field by using two-color digital particle image velocimetry (PIV) are presented for spatially periodic flows in a duct of width/height ratio 2 with a detached turbu-lator array. The turbulators were square ribs and their detached-distance/height ratio was 0.58. The rib-height/duct-height ratio and the pitch/rib-height ratio were 0.133 and 10, respectively. Fluid flow was operated at a Reynolds number of 2 ґ 104. Complementary laser Doppler velocimetry (LDV) measurements were also performed to allow the comparison of the mean flow quantities measured by the two techniques. Reasonable agreement was attained. The instantaneous interaction between the wall-jet emitted from the rib detachment clearance, rib wake vortices, and core flow was clearly demonstrated and related to heat transfer augmentation.