基于三维扫描和射频加热的食品升温过程模拟

Application of 3D scanning method in radio frequency heating simulation

为提升模拟精度,以马铃薯为例,选取两种不规则形状的样品,运用三维扫描仪获取精确的几何模型,导入多物理场耦合有限元软件中,求解其在不同功率/电压下射频加热过程中的温度分布,并进行试验验证。结果表明,射频加热40min后,模拟计算结果的温度分布、最高与最低温度值以及内部点升温曲线均与试验结果较一致,两种样品的模拟精度均达90%以上。三维扫描方法适用于射频加热不规则样品的模拟,且样品形状的差异以及极板电压的变化均未影响射频加热模拟的精确性。

In order to improve the simulation accuracy, this paper took potatoes as examples, selected two irregular-shape potatoes, used a three-dimensional scanner to obtain the accurate geometries, imported the geometries into a multiphysics finite element software COMSOL Multiphysics , solved its temperature distribution field under different powers/voltages, and carried experiment verifications. Results show that after 40 minutes of RF heating, the temperature distribution, maximum and minimum temperature values and internal time-temperature curves of the simulated results are in good agreement with the experimental results with a simulation accuracy over 90%. This method is suitable for simulating RF heating processes of irregular-shape samples. Variations of sample shape and plate voltages do not have significant influence to the accuracy of RF heating simulation.