Heat transfer from glass melt to cold cap: Melting rate correlation equation
- Pacific Northwest National Laboratory Richland, Washington
- Laboratory of Inorganic Materials Joint Workplace of the University of Chemistry and Technology Prague, and the Institute of Rock Structure and Mechanics of the ASCR Prague Czechia
- U.S. Department of Energy, Office of River Protection Richland WA 99352.
The efficiency of all‐electric melters is a hot topic not only in the waste glass melting industry, but also in the commercial melting industry, where stringent environmental regulations and rapid development of renewable energy ask for transformation of current technologies. The heat transfer for the batch conversion into molten glass is controlled by convection and conduction in the thermal boundary layer on the melt side, and by the properties of the foam layer at the batch/melt boundary. An overview of factors affecting heat transfer is presented and assessed using data from laboratory‐ and pilot‐scale experiments. Aside from increasing the melter operating temperature, the heat flux can be enhanced by (a) lowering glass melt viscosity, (b) decreasing the temperature at which the foam collapses at the cold cap bottom, and (c) increasing the melt convection. Although the melt viscosity depends on glass composition, limited by the desired product properties, the understanding of foaming behavior can guide the selection of batch materials that foam less and melt easily. Since a rigorous formulation of the complex region at the cold cap bottom has not been developed yet, the boundary layer approach was adopted to obtain a semiempirical relationship between the melting rate and experimentally accessible feed properties.
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- AC05-76RL01830
- OSTI ID:
- 1472198
- Alternate ID(s):
- OSTI ID: 1506686
- Journal Information:
- International Journal of Applied Glass Science, Journal Name: International Journal of Applied Glass Science Journal Issue: 2 Vol. 10; ISSN 2041-1286
- Publisher:
- Wiley-BlackwellCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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