微波辐射下CaSO4生成反应过程中的热点特性

在微波辐射化学反应过程中，常常会因为存在热点而导致爆炸或反应物烧毁等现象发生。本文以微波辐射下的硫酸钙生成反应为例，利用有限元方法求解Maxwell方程组、流体力学方程以及热传导方程，研究了微波辐射反应过程中热点的变化情况，并用实验验证了计算结果的正确性。研究结果表明：在加热过程中，随反应的进行，热点的位置是在不断变化的，且热点常出现在物质分相界面附近。

Hot spots during production of CaSO4 under microwave radiation

During the chemical reactions under microwave radiation，hot spots can usually be observed.Sometimes，hot spots may burn the reactants down or result in an explosion.A numerical model was presented to study the hot spots during the precipitation of calcium sulphate associated with microwave heating.Maxwell’s equations coupled with hydrodynamic equations and heat conduction equation were solved by using the finite-element method（FEM）.The calculated results were in agreement with the experiments.The results showed that the location of the hot spots was variable，which was related to the precipitant of calcium sulphate，and the hot spots often existed near the interfaces between the solution and air or the precipitant.