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Journal of Flow Visualization and Image Processing
SJR: 0.11 SNIP: 0.312 CiteScore™: 0.1

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

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.2018027523
pages 259-275

FLOW CHARACTERISTICS BEHIND SURFACE MOUNTED ROUNDED SLIT RIBS

Vaibhav Sharma
AVTAR (Aerodynamics Visualization and Thermal Analysis Research) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Andallib Tariq
AVTAR (Aerodynamics Visualization and Thermal Analysis Research) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Anjana Prajapati
AVTAR (Aerodynamics Visualization and Thermal Analysis Research) Laboratory, Department of Mechanical and Industrial Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India

ABSTRAKT

This paper presents investigation of the flow field of a new type of rib geometry (round edged with slit) mounted transversely on the bottom wall in a rectangular duct. Flow characteristics were measured using the two-dimensional particle image velocimetry (2D PIV) technique. The objective of the present work was to study the combined effect exerted by the rounded edge along with a longitudinal continuous slit (parallel and converging) and to develop an understanding of the fluid flow characteristics. Experiments were carried out for flow over a rib with 14.5% blockage ratio and 10% open area ratio. Three different rib configurations having a converging slit angle of 0°, 5°, and 10°, respectively, have been considered. The 0° slit ribs corresponded to parallel slit ribs. The PIV measurements have been performed in a vertical plane at a Reynolds number of 6200 (based on hydraulic diameter) and three different values of rib pitch to height ratio (5, 10, and 15). Overall, the emphasis is placed on investigation of the flow structures and their dynamics in the interrib region in terms of time-averaged streamlines, mean velocities, coherent structures, and fluctuation statistics. The results show that the flow coming out from a slit significantly affects the magnitude of the streamwise velocity, fluctuation statistics, and vorticity. Further, a significant reduction in the size of the primary recirculation bubble as well as the absence of small eddies just behind the ribs are observed. Reduction in the reattachment length is also detected for converging slitted round edged ribs as compared to parallel slit round edged ribs.


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