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Atomization of Borosilicate Glass Melts for the Fabrication of Hollow Glass Microspheres

Title data

Helling, Tobias ; Reischl, Florian ; Rosin, Andreas ; Gerdes, Thorsten ; Krenkel, Walter:
Atomization of Borosilicate Glass Melts for the Fabrication of Hollow Glass Microspheres.
In: Processes. Vol. 11 (2023) . - 2559.
ISSN 2227-9717
DOI: https://doi.org/10.3390/pr11092559

Official URL: Volltext

Project information

Project title:
Project's official title
Project's id
MicroBubble
13FH132PX8

Project financing: Bundesministerium für Bildung und Forschung

Abstract in another language

Direct atomization of a free-flowing glass melt was carried out using a high-speed flame with the aim of producing tiny, self-expanding glass melt droplets to form hollow glass microspheres. Atomization experiments were carried out using a specially adapted free-fall atomizer in combination with a high-power gas burner to achieve sufficient temperatures to atomize the melt droplets and to directly expand them into hollow glass spheres. In addition, numerical simulations were carried out to investigate non-measurable parameters such as hot gas velocities and temperatures in the flame region by the finite volume-based software Star CCM+® (v. 2022.1.1), using the Reynolds-Averaged Navier–Stokes (RANS) turbulence and the segregated flow model. To calculate the combustion process, the laminar flamelet method was used. The experiments and simulations indicated that a maximum gas velocity of about 170 m/s was achieved at the point of atomization in the flame. The particle size distribution of the atomized glass droplets, either solid or hollow, ranged from 2 µm to 4 mm. Mean particle sizes in the range of 370 µm to 650 µm were highly dependent on process parameters such as gas velocity. They were in good agreement with theoretically calculated median diameters. The formation of hollow glass microspheres with the proposed concept could be demonstrated. However, only a small fraction of hollow glass spheres was found to be formed. These hollow spheres had diameters up to 50 µm and, as expected, a thin wall thickness.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: hollow glass microspheres; glass melt atomization; low melting glass; free-fall atomizer; CFD simulation
Institutions of the University: Research Institutions > Research Units > Keylab Glass Technology
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 05 Apr 2024 05:40
Last Modified: 05 Apr 2024 05:40
URI: https://eref.uni-bayreuth.de/id/eprint/89161