ARTICLE:

• QUALITATIVE ESTIMATES OF CONVECTIVE HEAT TRANSFER IN A VOLUMETRICALLY HEATED FLUID  download article

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

P. S. Kondratenko
Nuclear Safety Institute, Russian Academy of Sciences, Bolshaya Tul'skaya 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.

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