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Wall-Pressure Fluctuations of Modified Turbulent Boundary Layer with Riblets

Abdulbari, Hayder A. and Hassan D., Mahammed and Zulkefli, Yaacob and Wafaa, Kamil Mahmood (2016) Wall-Pressure Fluctuations of Modified Turbulent Boundary Layer with Riblets. International Journal of Mechanical & Mechatronics Engineering, 16 (1). pp. 23-34. ISSN 2077-124X (Online); 2227-2771 (Print)

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Abstract

The experimental design incorporated to study the response of a turbulent pressure drop fluctuations to differently shaped longitudinal grooves, involved three conformations or structures being triangular, trapezoidal and spaced triangular grooves with height 800 m. The ratios of the groove height to groove space for triangular were: 1, 0.8, 0.6 and 0.4. Experiments were therefore performed at free stream velocity up to 0.44m/sec, which were corresponding to Reynolds number (Re)5.3×. The development of the obtained turbulent layerdownstream 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 and trapezoidal riblets.

Item Type: Article
Uncontrolled Keywords: pipelines, drag reduction, skin friction, riblets, geometry
Subjects: T Technology > TP Chemical technology
Faculty/Division: Faculty of Chemical & Natural Resources Engineering
Depositing User: Mrs. Neng Sury Sulaiman
Date Deposited: 30 Dec 2016 06:11
Last Modified: 11 Jan 2018 07:31
URI: http://umpir.ump.edu.my/id/eprint/14737
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