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Proceedings of the 25th National and 3rd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2019)

ISBN Imprimer: 978-1-56700-497-7 (Flash Drive)
ISBN En ligne: 978-1-56700-496-0

Investigation and Validation of Micro-textured Riblet Surface for Drag Reduction

DOI: 10.1615/IHMTC-2019.1490
pages 889-894

Vikas Sharma
Mechanical and Industrial Engineering Department, IIT Roorkee, Uttarakhand, India

Sushanta Dutta
Mechanical and Industrial Engineering Department, IIT Roorkee, Roorkee, Uttarakhand, India

Résumé

The study aims at reducing the drag produced over a flat surface. The motivation for the research comes from several aquatic animals which in spite of having huge weight have good manoeuvrability. Numerical simulations are performed to investigate the effect of micro-textured riblet surface for drag reduction over a flat surface. Effects of geometric as well as flow parameters on the drag are analysed. Validation of the non-dimensional geometric parameter is done by comparing the results of two different Reynolds number. Simulations are carried out by maintaining an external flow condition. Fundamental concepts which are responsible for drag reduction in micro-scale are studied. It is found that drag reduction is maximized in the spacing range of 15-20 turbulent wall units. Maximum drag reduction is found to be around 10% for sawtooth riblet profile. It is expected that optimized riblet could be used for experimental test and could be further implemented in real-life applications.