NIKOLAYEV, Vadim; GARRABOS, Yves; LECOUTRE-CHABOT, Carole; CHARIGNON, T.; HITZ, Denis; CHATAIN, Denis; GUILLAUMENT, Romain; MARRE, Samuel; BEYSENS, Daniel

doi:10.1007/s12217-015-9447-8

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NIKOLAYEV, Vadim
Service de physique de l'état condensé [SPEC - UMR3680]
Systèmes Physiques Hors-équilibre, hYdrodynamique, éNergie et compleXes [SPHYNX]

GARRABOS, Yves
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

LECOUTRE-CHABOT, Carole
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

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Microgravity Science and Technology. 2015, vol. 27, n° 4, p. 253-260

Springer

Résumé en anglais

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.< Réduire

Mots clés en anglais

Bubble growth

CHF

Departure from nucleate boiling

Boiling cisis

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Boiling crisis dynamics: low gravity experiments at high pressure

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Résumé en anglais

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