Experimental characterization of a free thermal plume and in interaction with its material environment |
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| Authors: | Taoufik Naffouti Jamil Zinoubi Rejeb Ben Maad |
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| Affiliation: | 1. Faculté des Sciences de Tunis, Département de Physique, Laboratoire d’Energétique et des Transferts Thermique et Massique, El Manar 2092, Tunis, Tunisia;2. Institut Préparatoire aux Études d’Ingénieurs El-Manar, El-Manar 2092, Tunis, Tunisia;1. Tomsk Polytechnic University, Lenin Avenue, 30, Tomsk, 634050, Russia;2. Tomsk State University, Lenin Avenue, 36, Tomsk, 634050, Russia;1. Department of Building Services Engineering, The Hong Kong Polytechnic University, China;2. Institute of Thermal and Environment Engineering, School of Mechanical Engineering, Tongji University, China;1. School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia;2. Department of Mechanical Engineering, The University of Auckland, Auckland, New Zealand;1. Microgravity Research Centre, Université libre de Bruxelles, Avenue F. Roosevelt 50, 1050 Bruxelles, Belgium;2. Institute for Materials and Processes, School of Engineering, The University of Edinburgh, EH9 3JL Edinburgh, United Kingdom |
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| Abstract: | This investigation analyses the behaviour of a turbulent thermal plume evolving in a neutral environment and in interaction with its surrounding material. The thermal plume is created by a rectangular hot source. This source is placed at the entry of a vertical parallelepipedic canal opened at the ends. Firstly, we studied the behaviour of a free thermal plume. The flow visualization and the analysis of the thermal and dynamic fields enabled us to detect the existence of two zones during the vertical evolution of the plume. A first zone of plume development followed by a zone of established turbulence. Secondly, we described the structure of a thermal plume produced by the same source inside the vertical canal. In this case the experimental results show clearly a change of the turbulent structure of the flow in comparison with the free plume. This difference is especially characterized by the appearance of a supplementary zone just above the source that is added to the two zones described previously. In addition, the comparison of the two studied configurations showed that the structure of the plume is narrowly affected by the confinement.In order to better define the fine structure of the flow, the temperature fluctuations spectra are analyzed. This spectral analysis enables us to show the fast destruction of the big structures vortexes by the confinement effect to give a smaller structure. |
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