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International Heat Transfer Conference 9

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

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

Paul W. Giel
Department of Mechanical Engineering The Pennsylvania State University; Sverdrup Technology, Inc., Brook Park, OH 44142

Frank W. Schmidt
Mechanical Engineering Department, Pennsylvania State University, 208 Reber Building, University Park, PA 16802-1413, U.S.A.

DOI: 10.1615/IHTC9.2990
pages 175-180

Abstract

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.

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