Boiling crisis dynamics: low gravity experiments at high pressure
NIKOLAYEV, Vadim
Service de physique de l'état condensé [SPEC - UMR3680]
Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes [SPHYNX]
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Service de physique de l'état condensé [SPEC - UMR3680]
Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes [SPHYNX]
NIKOLAYEV, Vadim
Service de physique de l'état condensé [SPEC - UMR3680]
Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes [SPHYNX]
Service de physique de l'état condensé [SPEC - UMR3680]
Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes [SPHYNX]
BEYSENS, Daniel
Physique et mécanique des milieux hétérogènes [PMMH]
Service des Basses Températures [SBT ]
< Reduce
Physique et mécanique des milieux hétérogènes [PMMH]
Service des Basses Températures [SBT ]
Language
en
Article de revue
This item was published in
Microgravity Science and Technology. 2015, vol. 27, n° 4, p. 253-260
Springer
English Abstract
To understand the boiling crisis mechanism, one can take advantage of the slowing down of boiling at high pressures, in the close vicinity of the liquid-vapor critical point of the given fluid. To preserve conventional ...Read more >
To understand the boiling crisis mechanism, one can take advantage of the slowing down of boiling at high pressures, in the close vicinity of the liquid-vapor critical point of the given fluid. To preserve conventional bubble geometry, such experiments need to be carried out in low gravity. We report here two kinds of saturated boiling experiments. First we discuss the spatial experiments with SF 6 at 46 ∘C. Next we address two ground-based experiments under magnetic gravity compensation with H 2 at 33 K. We compare both kinds of experiments and show their complementarity. The dry spots under vapor bubbles are visualized by using transparent heaters made with metal oxide films. We evidence two regimes of the dry spots growth: the regime of circular dry spots and the regime of chain coalescence of dry spots that immediately precedes the heater dryout. A recent H 2 experiment is shown to bridge the gap between the near-critical and low pressure boiling experiments.Read less <
English Keywords
Bubble growth
CHF
Departure from nucleate boiling
Boiling cisis
Origin
Hal imported