Plenary Lecture

Qualification and Quantification of 2D Natural Convection Inside Diode Air-Filled Cavities. Application in Different Engineering Domains

Professor Abderrahmane Bairi
Universite Paris Ouest
Laboratoire de Thermique Interfaces Environnement
Departement Genie Thermique et Energie - GTE
FRANCE
E-mail: abairi@u-paris10.fr

Abstract: Temperature control is essential in engineering. This presentation is focused on steady state and transient natural convection phenomena occurring in air-filled closed cavities of parallelogrammic cross-section whose both hot and cold active walls remain vertical. The passive top and bottom walls of the channel are inclined with respect to the horizontal with an angle of inclination that can be either positive or negative. Thus the lateral walls of the cavity have a parallelogram-shape. The phenomena occurring in this type of cavities are very different from those taking place in the more frequent rectangular cross-section cavities used in engineering. Many configurations are examined by varying the inclination angle. When this angle is negative, the hot wall is above the cold one, so the convective heat transfer is smaller than in the case of the right cavity (zero angle). For positive values of the angle, the hot wall is below the cold one. For this last configuration, the natural convection is favored and maximum heat transfer occurs at a specific angle. The cavity is then qualified as "conductive" by similarity with the electronic diode and the cavity itself is called diode thermal cavity. The main objective of this presentation is to qualify and quantify the convective heat transfer for different configurations of the active hot wall of the cavity. Some aspects of the steady state and transient natural convection in parallelogrammic enclosures are presented for different ranges of the Rayleigh number. This type of cavities can be applied in different engineering domains as in solar thermal collectors, building or on-board electronic devices.

Brief Biography of the Speaker: Prof. Abderrahmane Bairi is Professor at the University of Paris Ouest, Head of Heat Transfer and Numerical Thermal Modelling Laboratories, Head of International relations of Thermal and Energy Engineering Department. His main teaching activities are related to heat transfer, experimental techniques and numerical methods. His research is carried out in the Laboratoire de Thermique Interfaces Environnement (LTIE) and deals with numerical and experimental natural convection, heat transfer at solid-solid interfaces, renewable energy and thermal characterization of materials. This research activity is applied to many engineering domains such as thermal control, aeronautics, building, solar energy, food industry and electronics control. Prof. Bairi is currently a member of the Editorial board of many scientific journals and Scientific Committees in the fields of Heat Transfer, Aerodynamics, Aeronautics and Terrestrial vehicle.