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Journal of Enhanced Heat Transfer
IF: 0.562 5-Year IF: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN Print: 1065-5131
ISSN Online: 1026-5511

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v8.i6.40
pages 397-409

Dryout Location in a Low-Porosity Volumetrically Heated Particle Bed

Ivan V. Kazachkov
Department of Energy Technology, Royal Institute of Technology, Brinellvagen 60,100 44 Stockholm, Sweden
M. J. Konovalikhin
Division of Nuclear Power Safety, Royal Institute of Technology, Stockholm, Sweden
Bal Raj Sehgal
Nuclear Power Safety, Royal Institute of Technology, 100 44 STOCKHOLM, Sweden

ABSTRACT

A mathematical model for the description of flow of a compressible fluid (steam) through the volumetrically heated porous bed with particular consideration of the nonthermal local equilibrium is formulated and solved numerically using the split step method. It is shown that initial thermodynamic perturbations, if they grow, will lead to a temperature escalation at a specific location. Furthermore, the data from the RIT (Royal Institute of Technology) POMECO (porous media coolability) experiments are used for the validation of the model.
Experimental investigation of the coolability of heat-generating porous beds, named POMECO, was performed. The subject of this investigation was the dryout heat flux as the limiting parameter for the steady state removal of the generated heat by boiling of the coolant. Focus was placed on low porosity, small particle size, and relatively large scale debris beds. In the debris bed, downcomer(s) of different configurations were built which would channel the water from the water overlayer to the bottom of the bed and develop a two-phase natural circulation flow loop, providing greater mass flow rate in the bed. A database on the enhancement of dryout heat flux by downcomers was obtained for low porosity uniform and stratified beds with heat addition of up to 1 MW/m3.


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