A feedback mechanism between crystals and bubbles in a RuO2-bearing melt

Pereira, Luiz; Nuernberg, Rafael; Podda, Olivier; Machado, Norma; Laplace, Annabelle; Pigeonneau, Franck; Kueppers, Ulrich; Hess, Kai-Uwe und Dingwell, Donald B. (2022): A feedback mechanism between crystals and bubbles in a RuO2-bearing melt. In: Journal of Non-Crystalline Solids, Bd. 582, 121456

Abstract

Crystals are known to affect bubble behavior in natural and industrial melts. In volcanology, high crystal contents (phi(c) > 30 vol.%) may drastically increase the suspension viscosity, altering bubble dynamics severely enough to modify eruptive style. During industrial glass production, crystals can affect the process and the final product. In this work, we investigate how a small crystallinity of nano-sized RuO2 (phi(c) similar to 2 vol.%) modifies bubble behavior in a melt, generating a cyclic gas-release phenomenon. We conduct a series of experiments on a three-phase system composed of a borosilicate melt, bubbles, and RuO2 crystals. Optical microscopic investigation is performed on the products of thermal treatment at 1000 degrees C for different durations. Based on viscosity measurements, contact angle measurements, and numerical simulations, we propose a mechanism of entrainment of bubbles carrying crystals to the upper surface accompanied by crystal aggregation, and followed by an increase in viscosity to explain the observed phenomenon.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Geowissenschaften > Department für Geo- und Umweltwissenschaften
• Themengebiete: 500 Naturwissenschaften und Mathematik > 550 Geowissenschaften, Geologie
• ISSN: 0022-3093
• Sprache: Englisch