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

Abstract : Crystals are known to affect bubble behavior in natural and industrial oxide glass melts.[1] In volcanology, high crystal contents (c > 30 vol.%) may drastically increase the suspension viscosity, altering bubble dynamics severely enough to modify the eruptive style.[2] During industrial glass production, crystals may affect the process and the final product, if formed in an uncontrolled way. In this work, we investigate in laboratory-scale how a small crystallinity of nano-sized RuO2 (c  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 °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.
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Submitted on : Friday, September 9, 2022 - 3:31:01 PM
Last modification on : Saturday, September 10, 2022 - 3:49:15 AM


  • HAL Id : cea-03773887, version 1



Luiz de Paula Pereira, Rafael Bianchini Nuernberg, Olivier Podda, Annabelle Laplace-Ploquin, Franck Pigeonneau, et al.. A feedback mechanism between crystals and bubbles in a RuO2-bearing melt. (ICG2022, Jul 2022, Berlin, Germany. ⟨cea-03773887⟩



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