The Numerical Simulation And Experimental Study Of Multiple Physical Fields In Chemistry Reaction Heated By Microwave

Microwave chemistry, as a fast developing disciplinal field, has been given more and more attention. But up to now, the interaction between microwave and chemical reaction has not been deeply understood and there is not reasonable explanation for some special effects in microwave heating on chemical reaction. Consequently, the non-thermal effects are uncertain problems. At the same time, there are not rigorous and effective methods to instruct the design of microwave chemistry reactor. It restricts the wide application of microwave in chemical industry, so developing numerical methods to simulate the interaction between microwave and chemical reaction is necessary. Further more, most of the chemical reactors are made by domestic microwave ovens, and the power generator is unstable while working, accordingly, the microwave power synthesizing is incoherent. It is helpful to simulate the temperature and electromagnetic field distribution with two incoherent microwave power generators, whose phase and frequency is randomly changing for the high power application of microwave in chemical industry. The two main contents and innovation points of this thesis are as follows: Firstly, Maxwell's equations combined with heat transport equation have been solved by FDTD with the leapfrog technique to simulate the heating process of water in the beaker which is placed in the rectangular waveguide. The temperature distribution in the beaker has been obtained as results. Moreover, we have studied the efficiency of microwave heating with two random phase and frequency changing microwave power generators. The absorbed quantity of heat and the temperature...