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Analysis of resonance during microwave thawing of slabs.

Author(s) : BASAK T.

Type of article: Article

Summary

Resonance or maxima in power absorption due to microwave incidence within a slab were analysed via transmitted and reflected waves. A generalized mathematical formulation for uniform plane waves was established to analyse travelling waves, stationary waves and microwave power absorption within a multiphase sample. Microwave thawing was studied for specific sample thicknesses which are selected based on greater power distribution within water samples. The enthalpy method is employed for modeling of thawing of ice samples where a superficial mushy region is assumed around the melting point. The analysis is based on the generalized mathematical formulation validates the local maxima in spatial power distribution during intermediate thawing stages obtained with the finite element based enthalpy formulation. The generalized mathematical analysis on multiple thawed regimes further illustrates the role of traveling waves on resonances in microwave power. The influence of resonance is attributed by a non-monotonic variation of thawing time with sample thicknesses either for one side incidence or both side incidence due to microwaves. Optimal thawing strategies are recommended based on greater power savings.

Details

  • Original title: Analysis of resonance during microwave thawing of slabs.
  • Record ID : 2004-1555
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 46 - n. 22
  • Publication date: 2003/10

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