Finite element analysis of heating with randomly incident microwaves

Microwave heating is a common method of heating in modern industrial and household applications nowadays. Long before the recent invention of Randomly Incident Microwaves (RIM), conventional Parallel Incident Microwaves (PIM) have been used as a power transferring method. PIMs have some drawbacks: uneven heating, sparking problems with sharp conducting bowls, and well-known law of energy balance and some reasonable assumptions, the analysis of heating with RIM reduces to a simple heat transfer equation, solvable by common commercial software. The set of heat generations for each finite element can be obtained by simple computation while considering the attenuation and focusing effects of microwaves. Several examples of finite element analysis were performed for fully open-type media and partially open-type media. The temperature contours of each case are provided to compare the effect of space between heated pine tree logs.