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Experimental Investigation and Numerical Modeling of Natural Convection Around an Infrared Montgolfiere Balloon at High Rayleigh Number

[+] Author Affiliations
G. Leplat, D. Donjat, P. Reulet, E. Laroche, P. Millan

ONERA, Toulouse, France

G. Parot, G. Letrenne

Centre National d’Etudes Spatiales, Toulouse, France

Paper No. HT2012-58237, pp. 707-716; 10 pages
  • ASME 2012 Heat Transfer Summer Conference collocated with the ASME 2012 Fluids Engineering Division Summer Meeting and the ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels
  • Volume 1: Heat Transfer in Energy Systems; Theory and Fundamental Research; Aerospace Heat Transfer; Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat and Mass Transfer in Biotechnology; Environmental Heat Transfer; Visualization of Heat Transfer; Education and Future Directions in Heat Transfer
  • Rio Grande, Puerto Rico, USA, July 8–12, 2012
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-4477-9
  • Copyright © 2012 by ASME


The present study concerns the investigation of external natural convection driven around a Montgolfiere scientific balloon. Ground measurements are carried out on a small scale heated model located within an enclosure. Non intrusive planar Particle Image Velocimetry and thermocouple sensors are used to characterize both dynamical behavior of the flow generated around the balloon and heat transfers on its surface. It is shown that a relative good agreement is reached on wall heat transfers with simplified axisymmetrical 2D RANS simulations. However significant discrepancies exist regarding the analysis of the flow topology and dynamic quantities in comparison with the experimental data. The proposed numerical rebuilding is thus completed with a 3D Delayed Detached Eddy Simulation (DDES) in order to overcome conventional RANS approach inability to represent low frequency thermal plume instabilities.

Copyright © 2012 by ASME



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