On the evaluation of dryout conditions for a heat-releasing porous bed in a water pool

Yakush, S. E.; Kudinov, Pavel

doi:10.1016/j.ijheatmasstransfer.2019.01.083

Cited by 5 publications

(1 citation statement)

References 22 publications

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“…Majority of investigations on multiphase flows in systems involving heat-generating porous media primarily deal with determination of the critical heat flux (CHF) and/or the dryout heat flux (DHF) in different situations [20][21][22][23][24][25][26][27][28][29]. WHile CHF quantifies the maximum thermal energy that can be removed from a system, DHF quantifies the minimum thermal energy level at which a system becomes uncoolable.…”

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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