CAJ | 학술논문

针对微波腔内不均匀电磁场导致的微波加热不均匀现象，利用金属对微波具有反射的特点，将导电粒子与运动物料相结合，研究了随机运动导电粒子对微波转筒干燥腔内电场分布的影响。利用EDEM与COMSOL软件将运动场与电磁场相耦合，模拟导电粒子的尺寸、数量以及随机运动方式对微波腔内电场分布的影响。结果表明：直径小于20,mm 的导电粒子对电场的影响较小；自由随机运动的导电粒子因粒子集聚而恶化微波腔内的电场分布；固定间距的随机运动导电粒子可提高微波腔内的平均电场强度及电场分布的均匀性。
침대미파강내불균균전자장도치적미파가열불균균현상，이용금속대미파구유반사적특점，장도전입자여운동물료상결합，연구료수궤운동도전입자대미파전통간조강내전장분포적영향。이용EDEM여COMSOL연건장운동장여전자장상우합，모의도전입자적척촌、수량이급수궤운동방식대미파강내전장분포적영향。결과표명：직경소우20,mm 적도전입자대전장적영향교소；자유수궤운동적도전입자인입자집취이악화미파강내적전장분포；고정간거적수궤운동도전입자가제고미파강내적평균전장강도급전장분포적균균성。
Non-uniform heating is a major problem in microwave applications,mainly due to inherently uneven distribution of electromagnetic energy in the microwave applicator. This research work is aimed to improve the uniformity of electric field distribution by utilizing the microwave reflection of the electrically conductive beads which move randomly in a mi-crowave rotary drum. Commercial softwares,EDEM and COMSOL,were coupled to simulate the interactions of multi-physical fields of the particles’ movement and the electromagnetic field. The effects of size,number and ways of random movement of the electrically conductive beads on the electric field distribution in the microwave applicator were discussed. The results show that the influence of beads on the electric field is small when the bead diameter is less than 20,mm;beads in free random motion deteriorate the electric field distribution due to the agglomeration of beads;beads in random motion but restricted between a fixed distance can improve the intensity of the electric field and the uniformity of electric field distribution.