A comparison of models and methods for simulating the microwave heating of moist foodstuffs

Christopher J Budd, A D C Hill

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We study the problem of heating a one-dimensional approximation to a slab-sided moist foodstuff in a microwave oven, allowing for a phase change and drying. We initially investigate the accuracy of the Lambert law of exponential decay of the applied electric field into the foodstuff and derive an approximation for the field comprising the exponential decay term and an oscillatory component. We then show that the temperature of the foodstuff is given, to a good approximation, by only considering the heating effects of the exponentially decaying field. We then study the effects of drying. This process changes the dielectric properties of the material, which leads to changes in the field. However, these lead to smaller changes in the moisture content. A fast and accurate numerical method is derived which relies on smoothing the phase transition.
Original languageEnglish
Pages (from-to)807-817
Number of pages11
JournalInternational Journal of Heat and Mass Transfer
Volume54
Issue number4
Early online date24 Nov 2010
DOIs
Publication statusPublished - 31 Jan 2011

Keywords

  • Lambert law
  • foodstuff
  • smoothed enthalpy method
  • microwave heating

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