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Inferring Thermal Turbulent Structures Properties in the Wake of an Array Cylindrical Obstacles

Mulahasan, S; Stoesser, T; (2018) Inferring Thermal Turbulent Structures Properties in the Wake of an Array Cylindrical Obstacles. In: Proceedings of the River Flow 2018 : 9th International Conference on Fluvial Hydraulics. (pp. pp. 1-8). E3S Web of Conferences: Lyon, France. Green open access

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Abstract

In this study a thermal camera was used to inferring the properties of thermal turbulent structures at the water surface of an array of emergent vertical cylindrical obstacles located in staggered fashion at one side of an open channel flow. Three different diameters (D = 1.25 cm, 2.5 cm and 5.0 cm) were tested. A thermal camera SC640 was used to record a series of snapshots of the water surface temperature distribution in the wake of the cylinders at section where the flow was uniform and fully developed. The selection was made after watching a video to locate the most suitable areas for eddies and turbulence development. For the selected location, temperature values were extracted for each sequence at five selection points in the wake region using Matlab software. Time series of temperature for the snapshots of the five selected points in the area of eddy formation were drawn. The energy of the eddies were extracted using Fourier transforms. The results showed successive peaks with a slope of - 5/3. Evaluation of the eddies in the wake of the cylindrical rods showed that the energy of the eddies is small at high frequency and large eddies were observed at low frequencies.

Type: Proceedings paper
Title: Inferring Thermal Turbulent Structures Properties in the Wake of an Array Cylindrical Obstacles
Event: River Flow 2018 : 9th International Conference on Fluvial Hydraulics
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/e3sconf/20184005007
Publisher version: https://doi.org/10.1051/e3sconf/20184005007
Language: English
Additional information: This is an open access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10058275
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