Author
Ricardo Miguel Costa Mimoso
Bio: Ricardo Miguel Costa Mimoso is an academic researcher from Instituto Superior Técnico. The author has contributed to research in topics: Relative permittivity & Permittivity. The author has an hindex of 2, co-authored 2 publications receiving 16 citations.
Papers
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TL;DR: In this article, a methodology was developed and coded to automatically control the microwave energy supply and to maximize the material's microwave absorption during the 3D transient simulation, which was applied to the continuous melting of a glass raw material powder, the results showed promising energy consumption reduction and improved task efficiency.
18 citations
TL;DR: In this paper, a computational method for the calculation of the effective complex permittivity of a heterogeneous material using its microscopic properties and structure is presented. But the method does not guarantee that the electric energy stored and dissipated by the heterogeneous materials is the same.
Abstract: This work presents a computational method for the calculation of the effective complex permittivity of a heterogeneous material using its microscopic properties and structure. The new method to calculate the effective properties aims to guarantee that the electric energy stored and dissipated by the heterogeneous material is the same. The analysis of a bi-phase mixture with periodic cubic sample was tested to check the homogenization of the material. An iterative procedure that corrects the initial permittivity yields an electric field distribution of the effective material that is in good agreement with the electric field of the real mixture.
4 citations
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TL;DR: In this article, a fully coupled electromagnetic-thermal-mechanical model was developed to investigate the influence of coal compaction, thermal expansion, thermal-induced gas desorption, and sorption-induced coal deformation on coalbed methane (CBM) extraction.
61 citations
TL;DR: In this paper, a three-dimensional mathematical model was developed for a rectangular TE10n microwave heating cavity system, working at 2.45 GHz, where the dielectric properties, e' and e'', of NaY zeolite were evaluated as a function of temperature.
54 citations
TL;DR: In this paper, the authors focused on the influence of various design parameters on microwave heating performance by coupling of the electromagnetic and the heat transfer equations by COMSOL multiphysics software.
42 citations
TL;DR: A highly sensitive microwave near-field sensor based on electrically-small planar resonators is proposed for highly accurate characterization of dielectric materials and was developed in a robust complete-cycle topology optimization procedure wherein the sensing area was pixelated.
Abstract: A highly sensitive microwave near-field sensor based on electrically-small planar resonators is proposed for highly accurate characterization of dielectric materials. The proposed sensor was developed in a robust complete-cycle topology optimization procedure wherein first the sensing area was pixelated. By maximizing the sensitivity as our goal, a binary particle swarm optimization algorithm was applied to determine whether each pixel is metalized or not. The outcome of the optimization is a pixelated pattern of the resonator yielding the maximum possible sensitivity. A curve fitting method was applied to the full-wave simulation results to derive a closed form expression for extracting the dielectric constant of a chemical material from the shift in the resonance frequency of the sensor. As a proof of concept, the sensor was fabricated and used to measure the permittivity of two known liquids (cyclohexane and chloroform) and their mixtures with different volume ratios. The experimentally extracted dielectric constants were in an excellent agreement with the reference data (for pure cyclohexane and chloroform) or those obtained by mixture formulas.
37 citations
TL;DR: In this paper, the authors reviewed the model development of microwave heating under different application scenarios in recent years, new CFD models for microwave-assisted gasification of biomass are also introduced.
30 citations