Analysis of microwave induced natural convection in a single mode cavity (Influence of sample volume, placement, and microwave power level) |
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Authors: | W KlinbunP Rattanadecho |
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Institution: | a Rattanakosin College for Sustainable Energy and Environment (RCSEE), Rajamangala University of Technology Rattanakosin, Puthamonthon Sai 5, Salaya, Nakornpathom 73170, Thailand b Research Center of Microwave Utilization in Engineering (RCME), Department of Mechanical Engineering, Thammasat University (Rangsit Campus), Klong Luang, Pathumthani 12120, Thailand |
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Abstract: | The heating of water layer using microwave oven with a rectangular waveguide has been studied both numerically and experimentally. The mathematical model is validated with the experimental data. The transient Maxwell’s equations are solved by using the Finite Difference Time Domain (FDTD) method to describe the electromagnetic field inside the waveguide and sample. The temperature profile and velocity field within sample are determined by the solutions of the momentum, energy and Maxwell’s equations. In this study, the effects of physical parameters, e.g. microwave power level, placement of sample inside the waveguide, volume of sample, are studied. The distribution of electric field, temperature profile and velocity field are presented in details. The results show good agreement between simulation results and experimental data. Conclusively, the mathematical model presented here correctly explains the phenomena of microwave heating of water layer. |
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Keywords: | Microwave heating Rectangular waveguide Mode TE10 Maxwell&rsquo s equation FDTD method |
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