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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

EXPERIMENTAL RESULTS OF HEAT TRANSFER DISTRIBUTION IN THE PEBBLE BEDS

Get access (open in a dialog) DOI: 10.1615/IHTC13.p18.120
10 pages

要約

The experimental results of the thermal hydraulic characteristics of pebble beds is an issue of high importance while designing the effective heat exchangers, modular gas-cooled or low-capacity mobile nuclear reactors, and also in the chemical and other industries. Heat exchanger and nuclear reactors efficiency can be improved by means of different arrangements of pebble beds. The objective of this paper is to present the results of the experimental investigation of the heat transfer from the spheres and to evaluate the effect of pebble bed structure and of adjoining surfaces to the heat transfer efficiency. The investigations are performed for two types of test sections - pebble beds placed between cylinders and thin annular pebble beds (i.e. spheres dumped in thin annular slots). Heat transfer from the spheres was investigated by means of the local modelling method, which reveals the heat transfer characteristics in different places of the pebble bed. The experimental results showed that in the case of rhombic pebble bed, placed between cylinders, the differences in the heat transfer from the spheres can reach up to 25 % depending on the position of sphere in respect to the cylinders. The results of performed experiments in the case of thin annular pebble beds demonstrated that maximum heat transfer from the spheres is at the relative width of the annular slot K equal to 1.07 and 1.75 of spheres diameter.