pages 1507-1525
DOI: 10.1615/ICHMT.2012.CHT-12.910
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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, NSW, 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 A. 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; Division of Building, Construction & Engineering CSIRO, North Ryde NSW 2113, Australia
摘要
Numerical and experimental investigations have been carried out to study the transition to turbulence of natural convective flows in a vertical conduit heated from one side. It is shown that the typical dynamics of large-scale structures of the flow and thermal fields of natural convection in open vertical channels are successfully modelled numerically by the use of the large-eddy algorithm. Furthermore, the 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 external disturbances play a significant role in the evolution of the dynamic behaviour of natural convective flows within the channel. Additionally, it is also demonstrated that a proper characterisation of the disturbance level in the ambient is necessary to bring the numerical and experimental results into close agreement.