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International Heat Transfer Conference 6

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

TURBULENT HEAT TRANSFER IN GAS−COOLED ANNULI AT HIGH TEMPERATURE DIFFERENCES

Jurgis Vilemas
Lithuanian Energy Institute, 3 Breslaujos str., LT-44403 Kaunas-35, Lithuania

M. Nemira
Institute of Physical and Technical Problems of Energetics, Academy of Sciences of the Lithuanian SSR, Kaunas, USSR

DOI: 10.1615/IHTC6.1230
pages 565-570

Abstrakt

Experimental data on local heat transfer in gas−cooled annuli are presented. Experiments have been carried aut in annuli with diameter ratios 0.1 to 0.6 and in a circular tube in the range of Ее 5,000 to 500,000 with temperature ratio Tw/Tb = ψ in the range of 1 to 3, relative lenghts of the test channels amouting to 120 hydraulic diameters. One−side and two−side heating modes were covered in the tests. Dependence relations generalized for the effects of variable physical properties of the fluid on the heat transfer in annuli have been derived.

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