The use of numerical simulation to design a microwave applicator dedicated to foaming is presented. During foaming, the load characteristics change, both in terms of permittivity, thermal properties and size and shape. The use of a growth law able to describe size and characteristics variations of the load as microwave heating proceeds allowed to determine the most suitable microwave source arrangement able to provide both good energy efficiency and heat generation homogeneity. Load shape variations are neglected, assuming that expansion occurs with shape retention. Despite its simplified nature, the model allows to compare different scenarios of microwave applicator geometry, showing the advantages of the multi-physics approach adopted. The designed applicator was built and tested, showing the feasibility at the industrial scale of rapid microwave foaming of starch based products of complex shape.
Design and optimization of a multi-port applicator for microwave assisted foaming / Veronesi, Paolo; Rosa, Roberto; Garuti, Marco; Botti, Claudio; Balocchi, Paolo. - (2013), pp. 302-305. (Intervento presentato al convegno 14th International Conference on Microwave and High Frequency Heating, AMPERE 2013 tenutosi a University of Nottingham, gbr nel 2013).
Design and optimization of a multi-port applicator for microwave assisted foaming
VERONESI, Paolo;ROSA, Roberto;BOTTI, Claudio;BALOCCHI, Paolo
2013
Abstract
The use of numerical simulation to design a microwave applicator dedicated to foaming is presented. During foaming, the load characteristics change, both in terms of permittivity, thermal properties and size and shape. The use of a growth law able to describe size and characteristics variations of the load as microwave heating proceeds allowed to determine the most suitable microwave source arrangement able to provide both good energy efficiency and heat generation homogeneity. Load shape variations are neglected, assuming that expansion occurs with shape retention. Despite its simplified nature, the model allows to compare different scenarios of microwave applicator geometry, showing the advantages of the multi-physics approach adopted. The designed applicator was built and tested, showing the feasibility at the industrial scale of rapid microwave foaming of starch based products of complex shape.
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