Date of Award
1-1-2023
Document Type
Thesis
Degree Name
M.S. in Engineering Science
First Advisor
Taiho Yeom
Second Advisor
Shan Jiang
Third Advisor
Farhad Farzbod
Relational Format
dissertation/thesis
Abstract
This thesis presents an experimental study of the flow around a grooved cylinder in an internal flow passage with a square cross-section. The effects of groove parameters, such as groove diameter (depth) and orientation (streamwise and longitudinal), on the wake characteristics and the pressure drop across the cylinders are investigated. Three Reynolds numbers of, 1230, 2000, and 2825, are tested. Particle image velocimetry (PIV) and cross-correlation techniques were used to measure the velocity fields and visualize the flow patterns. The results show that streamwise grooved cylinders with larger groove diameters (H2.0, H2.5, and H3.0) have reduced wake length and width and lower pressure differential compared to the baseline cylinder for the Reynolds numbers of 2825 and 2000. Only the H3.0 cylinder exhibits these desirable flow characteristics for all the tested Reynolds numbers. The contour visualization of streamlines and vorticity reveals the flow patterns and the wake structures around the grooved cylinders. The findings of this study suggest that streamwise grooved cylinders with larger groove diameters can be used to delay the flow separation, make the flow more stable, and reduce the pressure drop in an internal flow passage. Additionally, streamwise grooves are found to be more effective than longitudinal grooves, which serve the purpose of making the flow downstream more streamlined with less energy dissipation.
Recommended Citation
Dhakal, Jhalak, "Particle Image Velocimetry Investigation of Flow Around Grooved Cylinders" (2023). Electronic Theses and Dissertations. 2748.
https://egrove.olemiss.edu/etd/2748