On the time sequence of the transient flow boiling crisis at high subcooling
Résumé
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.
Origine | Fichiers produits par l'(les) auteur(s) |
---|