The composite producing the highest level of total dissipatedpower in both the Neumann and Dirichlet scenarios is found to have Mo concentration around 3% this composite is recommended for use in the first physical prototype of a MMW heat exchanger.iiĪcknowledgementsI would first like to thank my thesis advisor Professor Vadim Yakovlev of the Mathematical ScienceDepartment for his continuous support and guidance throughout the year. It is shown that, at 95 GHz, 10x10x10 mmblocks with Mo contents from 0.25 to 4% can be heated up to 1,000 C highly uniformly for 60-95s,depending on the percentage of Mo. It is shown that in the considered scenario with the Dirichletboundary condition, accuracy of the iterative FDTD solution of the coupled EM-thermal problemstrongly depends on the heating time step: maintaining a high temperature on the interface withthe metal plate triggers higher levels of non-uniformity of temperature fields and requires a smallertime step to achieve a sufficient level of adequacy.
Heat transfer 2d transient matlab fdtd full#
In addition to the case of full thermal insulation of the ceramicblock (Neumann scenario), with a Dirichlet boundary condition on the surface between the metalplate and the ceramic block, we imitate a special operational regime in which the metal plate ismaintained at a constant temperature to prevent the ceramic block from overheating.The FDTD model is verified by solving the underlying EM problem by the finite-element simulator, COM SOLM ultiphysics. Computationis based on experimental data on temperature-dependent dielectric constant, loss factor, specificheat, and thermal conductivity. EM and EM-thermal coupled problems are solved by the finitedifference time-domain (FDTD) technique (implemented in QuickW ave) for a block of AlN:Mocomposite that is backed by a thin metal plate and irradiated by a MMW plane wave. fluid).In this work, we develop a computational model to simulate EM and thermal processes ina simplified MMW heat exchanger and examine different ceramic materials to find the one thatmaximizes the device’s efficiency. This means theinteractions between the MMW field and an absorbing ceramic element of a heat exchanger needto be well understood to develop an efficient device in which the material is controllably heatedand the heat is efficiently transferred to another medium (e.g. These devices convert EM energy into usable thermal energy, relyingon the balanced interactions between EM, heat transfer, and fluid flow phenomena. Recent developments suggest using this technology in EM heat exchangers for solar energy collectors, microwave thermal thrusters, and ground-to-ground millimeterwave (MMW) power beaming.
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Luca Capogna, Department HeadĪbstractElectromagnetic (EM) heating is applied in a wide range of areas such as food engineering, chemistry, and materials science.
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Computational Characterization of Thermal Processes in anAlN:Mo Susceptor in a Millimeter Wave Heat ExchangerbyStephanie MartinA ThesisSubmitted to the Facultyof theWORCESTER POLYTECHNIC INSTITUTEin partial fulfillment of the requirements for theDegree of Master of ScienceinIndustrial MathematicsbyApril 2019Approved by:Dr.