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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

NATURAL CONVECTION IN ENCLOSURES HEATED FROM BELOW: NUMERICAL AND EXPERIMENTAL ANALYSIS WITH HOLOGRAPHIC INTERFEROMETRY AND PIV TECHNIQUE

Get access (open in a dialog) DOI: 10.1615/IHTC13.p6.20
12 pages

Аннотация

This paper describes the results of the experimental and numerical analysis carried out on the natural convective heat transfer inside a two-dimensional enclosure heated from below. The cavity is filled up with air (Pr = 0.71) that is cooled by the sidewalls. The discrete heater is layed on the lower surface of the enclosure. In the experimental analysis we used the holographic interferometry with the real-time and the double-exposure technique in order to analyse the temperature field at different Rayleigh numbers and to obtain the experimental correlation between the Rayleigh numbers and the average Nusselt numbers on the heated strip. Then the 2D particle image velocimetry (PIV) was used to measure the velocity fields at the same Rayleigh numbers. The double-exposure technique was used for the steady-state, while the real-time technique was also used to check the presence of plume oscillations. The experimental results were compared with the numerical results performed with the finite volume code Fluent 6.0. The convective phenomenon has been studied and the average Nusselt numbers are presented in function of the analysed Rayleigh numbers.