Comparison of linear and non linear sweep rate regimes in variable frequency microwave technique for uniform heating in materials processing

Antonio, C. and Deam, R. T. (2005) Comparison of linear and non linear sweep rate regimes in variable frequency microwave technique for uniform heating in materials processing. Journal of Materials Processing Technology, 169 2: 234-241.


Author Antonio, C.
Deam, R. T.
Title Comparison of linear and non linear sweep rate regimes in variable frequency microwave technique for uniform heating in materials processing
Journal name Journal of Materials Processing Technology   Check publisher's open access policy
ISSN 0924-0136
1873-4774
Publication date 2005-11-10
Sub-type Article (original research)
DOI 10.1016/j.jmatprotec.2005.03.024
Volume 169
Issue 2
Start page 234
End page 241
Total pages 8
Place of publication Lausanne, Switzerland
Publisher Elsevier S.A.
Language eng
Abstract Materials processing using microwave technology have numerous advantages compared to traditional materials processing techniques; however, conventional microwave processing technology suffers from variable product quality due to uneven processing or heating. The variable frequency microwave (VFM) technique is an emerging technology that overcomes the inherent difficulties of uneven heating experienced in conventional microwave facilities and was developed for the purpose of processing many of today's advanced materials including polymers, composites and fibre-reinforced materials and is a rapid and controlled approach to uniform heating. By sweeping through a bandwidth of frequencies, the VFM method creates multiple hot spots within the processing cavity that lead to time-averaged uniform heating. The current work focuses on the sweep-rate regime used in VFMs and the effect of varying this parameter. A “recipe” for a non-linear sweep-rate regime is introduced and compared with the current linear sweep regime and conventional fixed-frequency processing in terms of heating uniformity. Theoretical modelling of the linear and non-linear sweep regimes are presented and are experimentally verified by heat-mapping of a multimode cavity with the aid of thermally sensitive material to quantify improvements in the uniformity of heating.
Keyword Variable frequency microwave (VFM)
Microwave processing
Uniform heating
Frequency sweeping
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Julius Kruttschnitt Mineral Research Centre Publications
 
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Created: Mon, 15 Aug 2011, 14:50:31 EST by Karen Holtham on behalf of Julius Kruttschnitt Mineral Research Centre