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Title: Determination of heat conductivity and thermal diffusivity of waste glass melter feed: Extension to high temperatures

The heat conductivity ({lambda}) and the thermal diffusivity (a) of reacting glass batch, or melter feed, control the heat flux into and within the cold cap, a layer of reacting material floating on the pool of molten glass in an all-electric continuous waste glass melter. After previously estimating {lambda} of melter feed at temperatures up to 680 deg C, we focus in this work on the {lambda}(T) function at T > 680 deg C, at which the feed material becomes foamy. We used a customized experimental setup consisting of a large cylindrical crucible with an assembly of thermocouples, which monitored the evolution of the temperature field while the crucible with feed was heated at a constant rate from room temperature up to 1100°C. Approximating measured temperature profiles by polynomial functions, we used the heat transfer equation to estimate the {lambda}(T) approximation function, which we subsequently optimized using the finite-volume method combined with least-squares analysis. The heat conductivity increased as the temperature increased until the feed began to expand into foam, at which point the conductivity dropped. It began to increase again as the foam turned into a bubble-free glass melt. We discuss the implications of this behavior for the mathematicalmore » modeling of the cold cap.« less
 [1] ;  [2] ;  [1] ;  [1] ;  [3]
  1. Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
  2. Inst. of Chemical Technology, Prague (Czech Republic)
  3. (Korea, Republic of)
Publication Date:
OSTI Identifier:
Report Number(s):
Journal ID: ISSN 0002-7863; 830403000; TRN: US1400445
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of the American Chemical Society; Journal Volume: 97; Journal Issue: 6
American Chemical Society (ACS)
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
Country of Publication:
United States
36 MATERIALS SCIENCE heat conductivity; glass batch; melter feed; cold cap; ; THERMAL DIFFUSIVITY