Boiling crisis dynamics: low gravity experiments at high pressure
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 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 at 46 C. Next we address two ground-based experiments under magnetic gravity compensation with H 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 experiment is shown to bridge the gap between the near-critical and low pressure boiling experiments.
Cite
@article{arxiv.1804.03050,
title = {Boiling crisis dynamics: low gravity experiments at high pressure},
author = {Vadim Nikolayev and Yves Garrabos and Carole Lecoutre and T. Charignon and Denis Hitz and Denis Chatain and Romain Guillaument and Samuel Marre and Daniel Beysens},
journal= {arXiv preprint arXiv:1804.03050},
year = {2018}
}