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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

A COMPARISON OF TURBULENCE MODELING PREDICTIONS TO EXPERIMENTAL MEASUREMENTS FOR HIGH RAYLEIGH NUMBER NATURAL CONVECTION IN ENCLOSURES

Get access (open in a dialog) DOI: 10.1615/IHTC9.2990
pages 175-180

Resumo

A numerical and experimental study of high Rayleigh number natural convection in an enclosure was conducted. A water-filled rectangular test cell was used, with opposing vertical walls heated and cooled isothermally, and all other walls thermally insulated. The height-to-width aspect ratio of the cell was 10.0 and the Rayleigh number based on height was 8.79 × 1010. Within this cell, regions of laminar, transitional, and turbulent flow were found. Detailed measurements of mean velocity were obtained with laser-Doppler anemometry and mean and rms fluid temperature measurements were made with fine-wire thermocouples.

A multilevel-multigrid scheme with a PISO solution algorithm was used to numerically predict the flow. Two variations of low-Reynolds number кε turbulence models were tested. The primary difference between the models was the treatment of the г boundary condition. Although the magnitudes of the effects of turbulence were generally over-predicted with one model and under-predicted with the other, both models predicted the locations of the laminar and turbulent flow regions reasonably well.