On the time sequence of the transient flow boiling crisis at high subcooling

Raksmy Nop (1, 2) , Marie-Christine Duluc (2, 3, 4) , Nicolas Dorville (1) , Artyom Kossolapov (5) , Florian Chavagnat (6) , Matteo Bucci (6)

1 STMF - Service de Thermo-hydraulique et de Mécanique des Fluides
2 LISN - Laboratoire Interdisciplinaire des Sciences du Numérique
3 COMET - COuplages Multiphysiques Et Transferts - LISN
4 Lafset - Laboratoire du froid et des systèmes énergétiques et thermiques
5 Department of Nuclear Science and Engineering
6 MIT - Massachusetts Institute of Technology

Transient flow boiling crisis at atmospheric pressure in highly-subcooled water (50, 75 K) is investigated with Reynolds numbers up to 35000. An exponential heat input is delivered with an escalation period τ covering the range 5 to 500 ms. We present the results using normalized values for time, wall temperature and the heat flux transferred to the water. The period τ and the subcooling are shown to have a major impact on transient boiling crisis while the Reynolds number has a minor effect. The time required for boiling crisis to happen is mainly spent in the single-phase heat transfer regime due to the high degree of subcooling. The time duration of the two-phase flow regime represents only a small part of the total duration and tends to zero as the power escalation period is reduced.

Domaines: Mécanique des fluides [physics.class-ph]; Thermique [physics.class-ph]

Raksmy Nop, Marie-Christine Duluc, Nicolas Dorville, Artyom Kossolapov, Florian Chavagnat, et al.. On the time sequence of the transient flow boiling crisis at high subcooling. 15th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Jul 2021, (Online), France. pp.1736. ⟨cea-04440565⟩