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首页> 外文期刊>Journal of food engineering >Simulation model for moving food packages in microwave heating processes using conformal FDTD method
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Simulation model for moving food packages in microwave heating processes using conformal FDTD method

机译：保形FDTD方法在微波加热过程中移动食品包装的仿真模型

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摘要

A numeric model was developed to couple electromagnetic (EM) and thermal field calculations in packaged foods moving in pressurized 915 MHz microwave (MW) cavities with circulating water at above 120 ℃. This model employed a commercial EM package with a customized heat transfer sub-model to solve EM field and thermal field equations. Both methods applied finite-difference time-domain (FDTD) method. An interface was built to facilitate the communication between electromagnetic and thermal models to incorporate the coupling feature which is unique to microwave heating process. Special numerical strategies were implemented to simulate the movement of food packages. The simulation model was validated with a pilot-scale microwave system using direct temperature measurement data and indirect color patterns in whey protein gels via formation of the thermally induced chemical marker M-2. Good agreements were observed. Four cases were studied to investigate the influence of power input and package gaps on heating uniformity. These applications demonstrated the flexibility of the model to allow its usage for system and process optimization.
机译：建立了一个数值模型，将在915 MHz微波（MW）加压腔中移动的包装食品中循环温度高于120℃的包装食品中的电磁（EM）和热场计算耦合在一起。该模型采用带有定制传热子模型的商业EM软件包来求解EM场和热场方程。两种方法都应用了时域有限差分（FDTD）方法。建立了一个接口，以促进电磁模型和热模型之间的通信，以结合微波加热过程独有的耦合功能。实施了特殊的数值策略来模拟食品包装的运动。通过直接温度测量数据和通过热诱导化学标记M-2形成的乳清蛋白凝胶中的间接颜色图案，使用中试规模的微波系统对模拟模型进行了验证。观察到良好的协议。研究了四个案例，以研究功率输入和封装间隙对加热均匀性的影响。这些应用程序证明了该模型的灵活性，可以将其用于系统和流程优化。

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