Journal
EXPERIMENTAL THERMAL AND FLUID SCIENCE
Volume 69, Issue -, Pages 19-26Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2015.07.020
Keywords
Flow control; Drag reduction; Surface roughness; Dimpled cylinder
Funding
- Singapore National Research Foundation (NRF) through the Competitive Research Programme (CRP) [NRF-CRP5-2009-01]
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In this paper, the flow past a circular cylinder with dimpled surface (the roughness coefficient k/D = 0.05, k is the depth of the dimple hole, and D is the diameter of the cylinder) was investigated. The experiments were conducted in an open water channel and the Reynolds number ranged from 7.43 x 10(3) to 1.798 x 10(4). Drag and lift forces on the cylinder were measured directly using a load cell. Two types of surface roughness were investigated, i.e., half dimpled and fully dimpled. The study revealed that the cylinder covered with dimples uniformly over the total surface could produce a drag coefficient of about 90% of a smooth cylinder. On the other hand, the force coefficients (drag and lift) of the half dimpled cylinder varied considerably, depending on the orientation of the dimpled surface with respect to the incident flow. The flow field in the wake of the cylinder was measured using particle image velocimetry (NV) technique, confirming that the dimpled surface could affect the strength of vortex shedding from the cylinder. (C) 2015 Elsevier Inc. All rights reserved.
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