Abstract
Conventional microwave heating has serious problems such as non-uniform heating and low efficiency. A novel magnetron microwave sweep frequency heating method is proposed to improve microwave heating uniformity. In this method, the frequency-sweeping signal is injected into the magnetron by the injection frequency-locking technique, and the microwave sweep frequency heating of the magnetron is realized. In this paper, a complicated injection frequency locking system is given and analyzed and a multiphysics calculation model based on the finite element method for electromagnetic waves and heat transfer is established. The calculation of microwave sweep frequency heating is realized by the combination of COMSOL and MATLAB. The results show that the sweep frequency heating has an obvious superiority. An experiment is carried out to verify the simulation results. The simulation results are in agreement with the experimental data. Moreover, the effect of sweep bandwidth and sweep interval on heating uniformity is discussed.
Highlights
In recent decades, microwave energy has been widely used as a highly efficient clean energy in various fields such as food processing, the chemical industry, and medicine [1,2,3]
In frequency-locked magnetron was used for the sweep frequency and fixed frequency heating experiments
The sweep frequency output of magnetron is realized by using injection-locking frequency theory
Summary
Microwave energy has been widely used as a highly efficient clean energy in various fields such as food processing, the chemical industry, and medicine [1,2,3]. Microwaves interact with polar molecules and charged ions. The friction resulting from molecule alignment and migration of charged ions in rapidly alternating electromagnetic field generates heat within matter. Microwave can penetrate the inside of the material to heat, and achieve the effect of simultaneous heating inside and outside [4]. Compared with the traditional heating method, microwave heating is characterized by efficient heating, internal heating, and environmentally friendly heating. Due to the uneven distribution of the electromagnetic field in the cavity, there are a series of problems such as poor heating uniformity, more hot spots and thermal runaway, etc. Due to the uneven distribution of the electromagnetic field in the cavity, there are a series of problems such as poor heating uniformity, more hot spots and thermal runaway, etc. [5]
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