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- Sundberg, Magnus, et al.
(author)
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Analysis and design of industrial microwave ovens using the finite difference time domain method
- 1996
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In: The Journal of microwave power and electromagnetic energy. - 0832-7823. ; 31:3, s. 142-157
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Journal article (peer-reviewed)abstract
- The Finite Difference Time Domain (FDTD) method is applied to industrial microwave ovens used in the food industry. Theoretical and practical aspects of FDTD analysis for this purpose are dealt with. Two different open-ended applicator types are described and analyzed numerically and experimentally and their relative performance is discussed. One of these applicators is a novel design based on low impedance TM modes which reduces edge-overheating and load reflections. It is shown that the common belief that the heating pattern from open-ended microwave applicators can be predicted from their radiation fields alone is often in error, and that resonances in the whole system of applicators and food loads are of major importance.
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| 2. |
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| 3. |
- Ryynanen, S., et al.
(author)
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The dielectric properties of native starch solutions : A research note
- 1996
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In: The Journal of microwave power and electromagnetic energy. - 0832-7823. ; 31:1, s. 50-53
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Journal article (peer-reviewed)abstract
- The dielectric properties of four native starch solutions, both gelatinized and ungelatinized with concentrations from 5 to 30% over the temperature range from 3°C to 95°C, were measured by a cavity perturbation technique at 2.75 GHz. The dielectric properties of the starch types did not differ from each other; the most important factor affecting the dielectric properties was the water content. Both the real permittivity (??) and the loss factor (??) decreased with increasing temperature and increasing starch concentration. The differences between gelatinized and nongelatinized samples were small, the ?? of nongelatinized starch being 2-3% higher and the ?? up to 5% lower than gelatinized starch.
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