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Continuous tubular microwave heating of homogeneous foods: evaluation of heating uniformity

Birgitta Wäppling Raaholt ; Sven Isaksson ; Lars Hamberg ; Andreas Fhager (Institutionen för signaler och system, Biomedicinsk elektromagnetik) ; Yngve Hamnerius (Institutionen för signaler och system, Biomedicinsk elektromagnetik)
The Journal of microwave power and electromagnetic energy (0832-7823). Vol. 50 (2016), 1, p. 43-65.
[Artikel, refereegranskad vetenskaplig]

A pilot-scale process for continuous in-flow microwave processing of foods, designed and implemented at SP Food and Bioscience, was evaluated for heat treatment of a homogeneous model food for high-temperature short-time (HTST) conditions, at constant total input microwave power, at 2450 MHz. The microwave system has three consecutive cavities, one excited by the TM020 microwave mode that heats primarily in the tube centre, and two TM120 mode cavities that heat primarily in the tube periphery. The temperature uniformity of the homogeneous model food after microwave heating is here evaluated in terms of spatial distribution, for different set-ups of input microwave power in each cavity and for different order of the placement of the cavities, while maintaining the total input microwave power. The microwave heating uniformity is evaluated, based on measured and calculated radial temperature profiles. Combined TM020 and TM120 heating was found to result in more uniform heating by means of spatial temperature uniformity over the tube cross section. Furthermore, appropriately selected microwave power distribution between the centre and periphery heating cavities results in a stable heating profile in the studied food, that differs only about 10 °C or less between highest and lowest average values directly after microwave heating.

Nyckelord: continuous process; homogeneous foods; Microwave in-flow heating; microwave pasteurization; microwave tubular heating; microwave-assisted HTST system; pumpable food

Denna post skapades 2016-09-22. Senast ändrad 2016-10-07.
CPL Pubid: 242204


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Institutioner (Chalmers)

Institutionen för signaler och system, Biomedicinsk elektromagnetik


Elektroteknik och elektronik

Chalmers infrastruktur