Library Subscription: Guest
ICHMT DL Home Current Year Archives Executive Committee International Centre for Heat and Mass Transfer


DOI: 10.1615/ICHMT.2008.CHT.1580
8 pages

Hassen Abbassi
Unit of Computational Fluid Dynamics and Transfer Phenomena National Engineering School of Sfax -Tunisia University of Sfax


The physical problem studied in this paper is the two-dimensional free convection of air in a rectangular cavity with one vertical wall heated and the other vertical wall cooled, the remaining two walls are insulated. Such configuration is well encountered in buildings as insulation system. Solutions are obtained in primitive variables by solving the Navier-Stokes, continuity and energy equations using control finite element method. The main objective of this study is the optimization of the global heat transfer from the hot wall to the cold wall by optimizing the cavity dimensions. Numerical results show that there is no aspect ratio that minimizes the heat transfer between the wall faces. For high Rayleigh numbers, there is been a particular aspect ratio for which the flux is maximum. To decrease enough the heat flux, we use the passive control. We placed two identical plates on the horizontal walls; their role is to break the flow induced by free convection and then reduces heat transfer by convection between the wall faces. The solutions have, as parameters, the Rayleigh number Ra, the aspect ratio Ar and the length h of the plates. It has been demonstrated clearly that the existence of the plates leads to a considerable decrease in heat transfer inside the cavity.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH