Numerical modeling of materials processing in microwave furnaces

摘要: A detailed numerical model is presented for predicting electromagnetic fields in microwave waveguides and cavities, the power deposition temperature distribution processed samples. Implementation of explicit finite difference schemes solving coupled unsteady Maxwell energy equations discussed. Simulations are performed illustrating influence working frequency, sample size dielectric properties. The occurrence resonant conditions, where constructive wave interference patterns produce high electric field intensities at discrete locations throughout cavity, shown to be key ingredient achieving heating levels. presence nonlinear processes significant materials which exhibit dependent This illustrated processing alumina, local produces an exponential rise temperature, once a critical level achieved.