In-situ X-ray and visual observation of foam morphology and behavior at the batch-melt interface during melting of simulated waste glass

0555548 - ÚSMH 2023 RIV GB eng J - Článek v odborném periodiku
Marcial, J. - Luksic, S. - Kloužek, Jaroslav - Vernerová, Miroslava - Cutforth, D. - Varga, T. - Hrma, P. - Kruger, A. - Pokorný, Richard
In-situ X-ray and visual observation of foam morphology and behavior at the batch-melt interface during melting of simulated waste glass.
Ceramics International. Roč. 48, č. 6 (2022), s. 7975-7985. ISSN 0272-8842. E-ISSN 1873-3956
Institucionální podpora: RVO:67985891
Klíčová slova: Batch melting * Batch foaming * Foam decay * X-ray imaging * Visual observation
Obor OECD: Ceramics
Impakt faktor: 5.2, rok: 2022
Způsob publikování: Open access
https://www.sciencedirect.com/science/article/pii/S0272884221037676?via%3Dihub

To attain a basic understanding of the primary foam structure and behavior, which affects the heat and mass transfer and the efficiency of the glass melting process, we investigated the primary foam layer under the glass batch floating on molten glass. The primary foam affects mass transfer during batch melting, in turn affecting the melting process. The recently performed direct in-situ three-dimensional X-ray computed tomography of the batch melting in a laboratory-scale melter vessel allowed us to visualize the features of the reacting batch layer and the foam that develops at its bottom, though with an insufficient resolution of images. In this study, we obtained better temporal and spatial resolution using the two-dimensional X-ray radiography and visual observation of the structure and behavior of transient primary foam as it formed and decayed. As soon as the batch was charged onto the melt surface, foam bubbles began to evolve, grow, and coalesce, forming a primary foam layer, 5-10 mm thick, within tens of seconds. This foam layer was sustained by ongoing gas evolving reactions counterbalanced by bubble coalescence into cavities that moved sideways and escaped to the atmosphere. Eventually, the entire remaining batch turned into foam that gradually decayed at the melt surface. The decay rate agreed with literature observations of surface foam produced by secondary foaming.
Trvalý link: https://hdl.handle.net/11104/0335415