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A device to achieve low Reynolds numbers in an open surface water channel

Radi, Alexander and Lo Jacono, David and Sheridan, John A device to achieve low Reynolds numbers in an open surface water channel. (2014) Experiments in Fluids, 55. ISSN 0723-4864

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Official URL: http://dx.doi.org/10.1007/s00348-014-1729-1

Abstract

When investigating flow structures, and espe- cially flow transitions, research projects often seek to increase insight using complementary numerical and physical experiments. Obtaining exact Reynolds number correspondence can frequently be difficult in experiments, particularly when relatively low values are required. Often, available test facilities were designed and optimised for a specific velocity range, meaning they have restrictions on the minimum flow velocity. This study describes a device to reduce the flow velocity locally in an open surface water channel. The underlying idea is to divert a controlled fraction of the incoming flow from the working section by increasing the pressure there, resulting in reduced velocity. This idea is realised using a ‘sub-channel’ that can be inserted into the main test chamber, with a variable porosity perforated screen at its downstream end. This study assesses and optimises the flow quality inside this structure, such as usable test section length, uniformity of the velocity profiles and turbulence intensity. The results demonstrate that the device creates high quality low Reynolds number flows, which is exemplified with the canonical circular cylinder in cross-flow.

Item Type:Article
Additional Information:Thanks to Springer Verlag editor. The definitive version is available at http://link.springer.com/article/10.1007%2Fs00348-014-1729-1
HAL Id:hal-01107249
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Monash University (AUSTRALIA)
Laboratory name:
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Deposited By: David LO JACONO
Deposited On:04 Dec 2014 11:52

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