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Wall-Pressure Fluctuations of Modified Turbulent Boundary Layer with Riblets

Hayder A. Abdulbari 1,2, Hassan D. Mahammed1, Z. Hassan, Wafaa K. Mahmood3
1 Faculty of Chemical and Natural Resources Engineering, Universiti Malaysia Pahang, Gambang 26300, Kuantan, Pahang, Malaysia,
2 Center of Excellence for Advanced Research in Fluid Flow, Universiti Malaysia Pahang, Gambang 26300, Kuantan, Pahang, Malaysia
3 Department of Manufacturing and Metallurgy, University of Technology, Baghdad, Iraq

Fluid Dynamics & Materials Processing 2016, 12(2), 86-101. https://doi.org/10.3970/fdmp.2016.012.086

Abstract

An experimental investigation was carried out to study the response of a turbulent pressure drop fluctuations to longitudinal groove riblets, involved two configurations being triangular and spaced triangular grooves with height 600, 800, 1000 μm and peak to peak spacing 1000 μm and 2000 μm respectively. Experiments were therefore performed at free stream velocity up to 0.44 m/sec, which were corresponding to Reynolds number (Re) 53000. The development of the obtained turbulent layer downstream of the grooves was then compared with the results from the corresponding smooth-wall case. To conclude, the effect of the spaced triangular riblets on the turbulent characteristics seemed to be more pronounced than the effects of the triangular riblets.

Keywords

Drag reduction, skin friction, riblets, geometry.

Cite This Article

Abdulbari, H. A., Mahammed, H. D., Hassan,, Z. (2016). Wall-Pressure Fluctuations of Modified Turbulent Boundary Layer with Riblets. FDMP-Fluid Dynamics & Materials Processing, 12(2), 86–101.



This work is licensed under a Creative Commons Attribution 4.0 International License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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