Channels, Fall 2020

Channels • 2 020 • Volume 5 • Number 1 Page 15 Conclusion In circular and elliptical cylinders, surface grooves perpendicular to the flow reduce the drag experienced by the cylinder due by producing turbulent or laminar vortices in grooves and decreasing the angle of separation of boundary layer which makes the wake region smaller and reduces the drag. Such drag reduction is observed in two- and three-dimensional flow. Acknowledgements The authors thank Cedarville Professor of Mechanical Engineering, Dr. Zhaohui (George) Qin for his leadership and advising of the students throughout the research process. They also thank Cedarville Dean of the School of Engineering and Computer Science, Dr. Robert Chasnov, for supplying the resources necessary to fabricate and test the physical models. They also thank Cedarville Professor Emeritus, Dr. Hardwood Hegna for training and assistance in obtaining accurate, consistent experimental data from the wind tunnel.