Coolability of Heat-Generating Porous Debris Beds in Severe Accident Situations

Chakravarty, Ajit K.; Datta, P. K.; Ghosh, Koushik; Sen, Swarnendu; Mukhopadhyay, Achintya

doi:10.1007/978-981-13-3256-2_12

Cited by 2 publications

(1 citation statement)

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“…Fundamental investigations into transport characteristics of single-phase flow in systems involving porous media with internal heat generation have observed the existence of buoyancy-driven flow leading to the establishment of natural and mixed convective flow situations [1][2][3][4][5][6][7][8][9][10]. The transport characteristics have been observed to depend on the heat source and permeability of the medium.…”

Section: Introductionmentioning

confidence: 99%

Impact of liquid coolant subcooling on boiling heat transfer and dryout in heat-generating porous media

Chakravarty¹,

Ghosh²,

Sen³

et al. 2021

Preprint

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The present article discusses the impact of liquid coolant subcooling on multiphase fluid flow and boiling heat transfer in porous media with internal heat generation. Although extremely relevant and important, only limited studies are available in the open literature on the effects of coolant subcooling in heat-generating porous media and hence, this requires a detailed analysis. The analysis is carried out using a developed computational model of multiphase fluid flow through clear fluid and porous media considering the relevant heat transfer and mass transfer phenomena. Results suggest that the qualitative nature of boiling heat transfer from the heat-generating porous body, with subcooled coolants, remain similar to that observed with a saturated coolant. Quantitative differences are, however, observed as a result of solid-liquid convective heat transfer, and competing mechanisms of boiling and condensation heat transfer, when subcooled liquid coolant is present. It is observed that a substantially larger heating power density is requiredas coolant subcooling is increased -for achieving the same temperature rise in the porous body. Dryout power density at different coolant subcooling is also observed to follow a similar trend. The thermal energy removal limit is, hence, observed to be substantially enhanced in presence of subcooled coolants. Further, the dryout region within the porous body is observed to gradually shift towards its interior as the coolant subcooling is increased.

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