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Numerical modelling of an innovative microwave assisted freezing process

机译：创新微波炉辅助冷冻过程的数值模型

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This study aimed to model an innovative process of pulsed microwave assisted freezing (MAF), which was expected to improve frozen product quality. The phase change model was based on spherical ice crystal growth and an original enthalpy formulation. The objective was to understand better the thermal interactions between microwaves and a product being frozen in a TE10 waveguide in which nitrogen gas and microwaves reach the product on the top surface. The 2D model was validated against the literature data and used to perform numerical simulations. The freezing front location and the reflection at air-product interfaces have a large impact on microwave behaviour in the product, especially on hot-spot displacement. As in some experimental works, temperature oscillations were observed. It is shown that their amplitude is related to the pulse duration. These results will help in designing experimental procedures to study the interest of using low energy pulsed microwaves during freezing. (C) 2017 Elsevier Ltd and IIR. All rights reserved.
机译：本研究旨在模拟脉冲微波辅助冷冻（MAF）的创新过程，预计将提高冷冻产品质量。相变模型基于球形冰晶生长和原始焓配方。目的是了解更好的微波和在TE10波导中冷冻的产品之间的热相互作用，其中氮气和微波在顶表面上到达产品。 2D模型针对文献数据验证并用于执行数值模拟。冻结前置位置和空气产品界面的反射对产品中的微波行为产生了很大的影响，特别是在热点位移。如在一些实验工作中，观察到温度振荡。结果表明，它们的幅度与脉冲持续时间有关。这些结果将有助于设计实验程序，以研究在冻结期间使用低能量脉冲微波的兴趣。 （c）2017年Elsevier Ltd和IIR。版权所有。

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