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ICHMT DIGITAL LIBRARY ONLINE

ISSN 961-91393-0-5

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$246.00 (Must be sent to your home address)

You can order single issue or individual article. To purchase a single issue or an individual article as well as to view tables of contents and abstracts click on issue number.

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Year 1996

• 1International Symposium on Transient Convective Heat Transfer
19 - 23 August, 1996, Çesme, Turkey

600 pages

Volume price - $179.00

QUALITATIVE ESTIMATES OF CONVECTIVE HEAT TRANSFER IN A VOLUMETRICALLY HEATED FLUID

L. A. Bolshov
Nuclear Safety Institute, Russian Academy of Sciences, Bolshaya Tulskaya 52, Moscow 113191, Russia

P. S. Kondratenko
Nuclear Safety Institute, Russian Academy of Sciences, Bolshaya Tulskaya 52, Moscow 113191, Russia

V. F. Strizhov
Nuclear Safety Institute, Russian Academy of Sciences, Bolshaya Tul'skaya 52, Moscow 113191, Russia

ABSTRACT

Qualitative correlations of heat transfer and charateristic transient times in a volumetrically heated fluid in a closed volume are obtained. The basis of the analysis are the relations deduced from the condition of energy balance and modern physical concepts on heat transfer processes in an energetically neutral fluid. Four main and one asymptotic regime of heat transfer, which differ from each other by exponents of power dependence of Nu number on Ra_I number is distinguished. Dependences Nu_up ∼ Ra_I^7/32 and Nu_dn ∼ Ra_I^1/4 take place in asymptotic limit when Ra_I^1/32 << 1 for heat transfer to the upper horizontal and faced down curved parts of the boundary respectively. In the range of values Ra_I which is of interest to the nuclear safety problem, the obtained theoretical correlations are in good agreement with the experiment.