Nowadays, it is well known that volumetric heating through microwaves inhibits certain surface properties from being achieved. Similarly, exclusively heating via thermal radiation is neither deep nor homogeneous enough for short periods of time. But combining both approaches can alleviate such issues. In fact, this kind of hybrid heating has been used for many years in real processes for thermal treatment of composite materials. Nonetheless, many questions remain unsettled. In this manuscript, we discuss the modeling and simulation of such a hybrid system, when heating a heterogeneous load composed of a solid core with three concentric spherical shells. The heating sources are given by electromagnetic waves in the microwave range, and by constant thermal radiation over one of the outer hemispheres. Only the core is considered to absorb the energy transported by the electromagnetic waves (high dielectric loss material). Hence, shells are transparent to microwaves (low dielectric loss materials). The thermophysical properties were considered constant with position. For all cases, peak temperature was observed in the geometrical center of the system, as has been shown by experimentation. Furthermore, simulation results revealed that this hybrid heating strategy has a drastic effect on the temperature profiles generated with only microwave, although the surface temperature homogeneity can be improved using an external electrical resistance.

中文翻译：

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基于微波和耐热性的复合材料混合热处理

如今，众所周知，通过微波进行体积加热会抑制某些表面特性的实现。同样，仅通过热辐射加热在短时间内既不够深也不够均匀。但是结合这两种方法可以缓解这些问题。事实上，这种混合加热在复合材料热处理的实际工艺中已经使用了很多年。尽管如此，许多问题仍未解决。在本手稿中，我们讨论了当加热由具有三个同心球壳的实心核组成的异质负载时，这种混合系统的建模和仿真。加热源由微波范围内的电磁波和外半球之一的恒定热辐射提供。只有铁芯被认为是吸收电磁波传输的能量（高介电损耗材料）。因此，外壳对微波是透明的（低介电损耗材料）。热物理性质被认为随位置恒定。对于所有情况，如实验所示，在系统的几何中心观察到峰值温度。此外，模拟结果表明，尽管可以使用外部电阻改善表面温度均匀性，但这种混合加热策略对仅使用微波产生的温度曲线有显着影响。热物理性质被认为随位置恒定。对于所有情况，如实验所示，在系统的几何中心观察到峰值温度。此外，模拟结果表明，尽管可以使用外部电阻改善表面温度均匀性，但这种混合加热策略对仅使用微波产生的温度曲线有显着影响。热物理性质被认为随位置恒定。对于所有情况，如实验所示，在系统的几何中心观察到峰值温度。此外，模拟结果表明，尽管可以使用外部电阻改善表面温度均匀性，但这种混合加热策略对仅使用微波产生的温度曲线有显着影响。