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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Print: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.2012005217
pages 443-456

NUMERICAL AND EXPERIMENTAL INVESTIGATION OF UNSTEADY NATURAL CONVECTION IN A VERTICAL OPEN-ENDED CHANNEL

Ghar Ek Lau
School of Mechanical and Manufacturing Engineering, the University of New South Wales
Victoria Timchenko
School of Mechanical and Manufacturing Engineering, The University of New South Wales, Sydney 2052, Australia
Christophe Menezo
Universite de Lyon, CNRS, France ; Chaire INSA-EDF Habitats et Innovations Energetiques, CETHIL, UMR5008, F-69621, Villeurbanne, France; University Savoie Mont-Blanc, LOCIE UMR CNRS 5271, Campus Scientifique Savoie Technolac − F- 73376, Le Bourget-du-Lac, France
Stephanie Giroux-Julien
Univ Lyon, CNRS, INSA-Lyon, Université Claude Bernard Lyon 1, CETHIL UMR5008, F-69621, Villeurbanne, France
Marco Fossa
Dime, Universita di Genova, Via Opera Pia 15a, 16145 Genova, Italy
E. Sanvicente
Centre de Thermique de Lyon (CETHIL, CNRS-INSA Lyon, Universite Lyon 1), Bat. Sadi Carnot, INSA de Lyon, 20 av. A. Einstein, 69 621 Villeurbanne Cedex, France
John Reizes
School of Mechanical and Manufacturing Engineering, UNSW-Sydney, Sydney 2052, Australia
Guan Heng Yeoh
School of Mechanical and Manufacturing Engineering University of New South Wales, NSW 2052, Australia; Australian Nuclear Science and Technology Organisation (ANSTO), PMB 1, Menai, NSW 2234, Australia

ABSTRACT

Numerical and experimental investigations have been carried out to study the unsteady behavior of natural convective flows in a vertical conduit heated from one side. It is shown that typical dynamics of large-scale structures in the flow and thermal fields of natural convection in open vertical channels are successfully modeled numerically by the use of the large-eddy algorithm. Furthermore, fluctuations in both the velocity and temperature fields are also captured, providing valuable insights into the instantaneous flow dynamics occurring within the channel. A comparison between numerical and experimental results indicates that the presence of external disturbances plays a significant role in the evolution of the dynamic behavior of natural convective flows within the channel. Additionally, it is demonstrated that a proper characterization of the disturbance level in the ambient is necessary to bring the numerical and experimental results into close agreement.


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