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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

NUMERICAL SIMULATION OF UNSTEADY FLOW AND HEAT TRANSFER IN RECTANGULAR NATURAL CIRCULATION LOOPS

Get access (open in a dialog) DOI: 10.1615/IHTC13.p6.120
11 pages

Sinopsis

The aim of this paper is to undertake a two-dimensional, numerical analysis of natural convection in a 2D-rectangular closed-loop thermosyphon filled with water. The loop is heated at a constant temperature over the bottom surface and cooled at a constant temperature over the top surface. The analysis has been performed for various rectangular geometries of the loop with different Rayleigh numbers. The values of the Rayleigh numbers for which the system manifests stable and unstable dynamics have been determined. Some conclusions are given on the two-dimensional flow for the different dynamic conditions. The numerical results have also been analyzed to find the main dimensionless parameters and the correlations between the Reynolds number and the frictional factor. Additionally, the role of the local pressure losses due to the elbows is highlighted.