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Local total and radiative heat-transfer coefficients during the heat treatment of a workpiece in a fluidised bed

Gao, Weimin, Kong, Lingxue and Hodgson, Peter 2006, Local total and radiative heat-transfer coefficients during the heat treatment of a workpiece in a fluidised bed, Applied thermal engineering, vol. 26, no. 14-15, pp. 1463-1470, doi: 10.1016/j.applthermaleng.2005.12.013.

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Title Local total and radiative heat-transfer coefficients during the heat treatment of a workpiece in a fluidised bed
Author(s) Gao, Weimin
Kong, LingxueORCID iD for Kong, Lingxue orcid.org/0000-0001-6219-3897
Hodgson, Peter
Journal name Applied thermal engineering
Volume number 26
Issue number 14-15
Start page 1463
End page 1470
Publisher Pergamon
Place of publication Oxford, United Kingdom
Publication date 2006
ISSN 1359-4311
1873-5606
Keyword(s) fluidised bed
heat transfer
radiation
heat treatment
metal
Summary The heat-transfer coefficients around a workpiece immersed in an electrically heated heat treatment fluidised bed were studied. A suspension probe designed to simulate a workpiece of complex geometry was developed to measure local total and radiative heat-transfer coefficients at a high bed temperature. The probe consisted of an energy-storage region separated by insulation from the fluidised bed, except for the measuring surface, and a multi-thermocouple measurement system. Experiments in the fluidised bed were performed for a fluidising medium of 120-mesh alumina, a wide temperature range of 110–1050 °C and a fluidising number range of 1.18–4.24. It was found that the workpiece surface temperature has a more significant effect on heat transfer than the bed temperature. The total heat-transfer coefficient at the upper surface of the workpiece sharply decreased at the start of heating, and then steadily increased as heating progressed, while a sharp decrease became a rapid increase and then a slow increase for the radiative heat-transfer coefficient. A great difference in the heat-transfer coefficients around the workpiece was observed.
Language eng
DOI 10.1016/j.applthermaleng.2005.12.013
Field of Research 091505 Heat and Mass Transfer Operations
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2006, Elsevier Ltd
Persistent URL http://hdl.handle.net/10536/DRO/DU:30003829

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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