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Minimising heat losses during batch ohmic heating of solid food

Paper ID Volume ID Publish Year Pages File Format Full-Text
19455 43066 2011 7 PDF Available
Title
Minimising heat losses during batch ohmic heating of solid food
Abstract

The influence of cell design on the uniformity of batch ohmic heating of a solid foodstuff was examined. Various ways of minimising heat loss from the cell surface including insulation or providing supplementary heat via a heating belt or panel were assessed but discarded in favour of housing the cell in a hot air cabinet maintained at 80 °C and eliminating the surrounding cell body. Various electrode materials and designs were evaluated prior to opting in favour of platinised titanium electrodes of minimal practicable thickness (1 mm). The final system developed involved the use of a combined ohmic/convection heating with the food stuff contained in a plastic casing pressurised between two spring-loaded electrodes. Under optimised conditions a maximum overall temperature variation of 12.1 °C within the product was achieved after 150 s which was reduced to 8.6 °C after 3 min standing time.

Keywords
Ohmic heating; Cell design; Electrode design
First Page Preview
Minimising heat losses during batch ohmic heating of solid food
Publisher
Database: Elsevier - ScienceDirect
Journal: Food and Bioproducts Processing - Volume 89, Issue 2, April 2011, Pages 128–134
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering