Effect of cold-cap-bottom shear stress on primary foam stability

Hrma, Pavel; Ferkl, Pavel; Pokorný, Richard; Kruger, Albert A.

doi:10.1016/j.jnoncrysol.2024.123262

Title: Effect of cold-cap-bottom shear stress on primary foam stability

Journal Article · 16 October 2024 · Journal of Non-Crystalline Solids

DOI: https://doi.org/10.1016/j.jnoncrysol.2024.123262 · OSTI ID:2513902

Hrma, Pavel ^[1];

^[2]; Pokorný, Richard ^[3]; Kruger, Albert A. ^[4]

U.S. Department of Energy, AttainX, Support Services Contractor to the Office of River Protection, Richland, WA (United States)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
University of Chemistry and Technology Prague (Czech Republic); Institute of Rock Structure and Mechanics of the Czech Academy of Sciences, Prague (Czech Republic)
U.S. Department of Energy, Office of River Protection, Richland, WA (United States)

Here, we analyze the heat transfer between the melt pool and the layer of reacting materials called cold cap, which is the determining factor for the glass production rate in Joule-heated air-bubbled nuclear waste glass melters. We consider the effects of bubbling rate, melt viscosity, melt thermal conductivity, conversion kinetics, and shear rate at the cold-cap bottom, and develop simple relationships for the cold-cap bottom temperature and glass production rate. We show that the melt convection enhances the heat transfer to the cold cap by suppressing the thermal boundary layer and primary foam, while the conversion kinetics opposes these effects. Additionally, we mention how dissolving silica particles affects the primary foam stability and discuss the limitations of the presented approach for vigorously foaming feeds.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2513902

Report Number(s):: PNNL-SA--202423

Journal Information:: Journal of Non-Crystalline Solids, Journal Name: Journal of Non-Crystalline Solids Vol. 646; ISSN 0022-3093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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