Mestrado em Engenharia Química
URI Permanente para esta coleção
Nível: Mestrado Acadêmico
Ano de início: 2014
Conceito atual na CAPES: 3
Ato normativo: Homologado no Parecer CES/CNE nº 487/2018, da Câmara de Educação Superior do Conselho Nacional de Educação, e no Parecer nº 00049/2019/CONJURMEC/CGU/AGU, da Consultoria Jurídica junto ao Ministério da Educação, proferidos nos autos do Processo nº 23001.000335/2018-51. Divulgado na portaria 609 (14/03/2019) e publicada no DOU (18/03/2019- Edição 52/Seção 1/pg 63).
Periodicidade de seleção: Semestral
Área(s) de concentração: Engenharia Química
Url do curso: https://engenhariaquimica.alegre.ufes.br/pt-br/pos-graduacao/PPEQ/detalhes-do-curso?id=1077
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- ItemAvaliação dos efeitos da modificação térmica nas propriedades de diferentes madeiras(Universidade Federal do Espírito Santo, 2025-08-01) Dias, Nathália Gabriele Franca; Alves, Rejane Costa; https://orcid.org/0000-0003-4059-3974; http://lattes.cnpq.br/8580447433109486; https://orcid.org/0000-0002-5255-7025; http://lattes.cnpq.br/7055222960818900; Carrasco, Edgar Vladimiro Mantilla; https://orcid.org/0000-0001-7870-0283; http://lattes.cnpq.br/3716965047168777; Dias Júnior, Ananias Francisco; https://orcid.org/0000-0001-9974-0567; http://lattes.cnpq.br/2428652077952117This study evaluated the effects of thermal modification on the chemical, physical, and mechanical properties of Eucalyptus sp., Pinus sp., and Cedrela sp. woods. The samples were subjected to heat treatments at 140°C, 180°C, 220°C, and 240°C in a reactor system, with a heating rate of 0.3°C/min. Chemical properties were evaluated through FTIR spectroscopy, X-ray diffraction, and thermogravimetric analysis; physical properties were assessed by apparent density, wettability, and colorimetry; and mechanical properties were analyzed through static bending, tension, compression, Janka hardness tests, and wave propagation. The results indicated that heat treatment significantly affects wood properties, varying according to species and temperature. Chemical analyses revealed degradation of hydroxyl groups and modifications in lignin, with a reduction in the crystallinity index. Apparent density decreased in the 220°C and 240°C treatments, especially for eucalyptus and cedar, with significant reduction observed at 140°C for Eucalyptus sp. Wettability progressively decreased with increasing temperature for Eucalyptus sp. and Cedrela sp., while pine showed increased wettability at lower temperatures, followed by reduction at higher temperatures, becoming equivalent to the control. Wood darkening was progressive, with the L* parameter being the most sensitive. Mechanical properties were most affected above 220°C, with the most significant reduction in modulus of rupture, with eucalyptus being the most sensitive species due to the effects of lignin plasticization at lower temperatures. Non-destructive methods showed strong correlation with static tests (R² > 90%). It is concluded that thermal modification is a viable technique to alter specific wood properties, with effects varying according to species and wood treatment temperature
- ItemAnálise do efeito das propriedades físicas de particulados na fluidodinâmica do leito de jorro cônico(Universidade Federal do Espírito Santo, 2025-03-21) Castanheira, Vinícius Castilholi; Carvalho, Romero Florentino de ; https://orcid.org/; http://lattes.cnpq.br/8949967345647610; Sousa, Robson Costa de ; https://orcid.org/0000-0002-2353-9098; http://lattes.cnpq.br/7320586055142013; https://orcid.org/0009-0007-2531-9324; http://lattes.cnpq.br/2776582781838015; Guidolini, Icaro Pianca; https://orcid.org/; http://lattes.cnpq.br/6264980481447359; Freire, Fabio Bentes; https://orcid.org/0000-0001-9258-360X; http://lattes.cnpq.br/8937961078558996The conical spouted bed has important applications in industrial processes such as drying and pyrolysis of biomass, in which they have varied physical characteristics, generating different fluid behaviors In this context, the present study aimed to To analyze the effect of the physical properties of particulate matter on the fluid-dynamic behavior of the conical spouting bed from the analysis of experimental data and the comparison with predictions of parameters obtained by empirical equations and correlations present in the literature. The characterization of the glass spheres, coffee and black pepper beans, annatto seeds, jackfruit, açaí and residue such as orange pomace involved the measurement of apparent densities, actual density, bulk density, bed porosity, diameter, sphericity and roundness. The conical spouting bed used has a total height of 70.0 cm, an internal diameter of 19.0 cm, a cylindrical column with a height of 47.0 cm, and a cone at the bottom of the column with a height of 15 cm with a tilt angle of 60º. The main effects of the physical properties showed that the highest pressure drops (maximum and stable) were influenced by physical characteristics such as density, mainly for glass spheres (2500 kg/m³) and açaí seeds (1366 kg/m³) and jackfruit (1209 kg/m³) in the case of biologic materials. The size of these materials also influenced the fluid dynamics of the bed, especially the minimum spouting velocity. The correlations adjusted with statistical treatment presented more satisfactory results in relation to the correlations found in the literature for the prediction of parameters such as Reynolds minimum spout, maximum pressure drop and stable spout. Finally, the study of fluid-particle interactions with the analyzed materials was carried out in the present work in conical spouted bed. It was possible to notice that materials of lower sphericity presented higher drag coefficients, being greater than drag force exerted by the fluid. By contrast, spherical particles exhibited lower flow resistance, resulting in a reduced drag coefficient. In general, it was possible to observe the real influence of physical properties on fluid dynamic parameters, and the results were consistent with what was observed in the literature
- ItemProdução de compósito plástico-madeira a partir de resíduos da indústria madeireira capixaba(Universidade Federal do Espírito Santo, 2025-02-12) Miranda Júnior, Gilson Mendonça de; Dias, Josinaldo de Oliveira; https://orcid.org/0000-0001-6865-851X ; http://lattes.cnpq.br/1030155171981790; Corrêa, Glaucinei Rodrigues ; https://orcid.org/0000-0002-4311-5444; http://lattes.cnpq.br/9878675593298644; Alves, Rejane Costa; https://orcid.org/0000-0003-4059-3974; http://lattes.cnpq.br/8580447433109486; https://orcid.org/0000-0002-9312-156X; http://lattes.cnpq.br/9786020486733199; Oliveira, Michel Picanço; https://orcid.org/0000-0001-9241-0194; http://lattes.cnpq.br/6383844066460475 ; Carrasco, Edgar Vladimiro Mantilla; https://orcid.org/0000-0001-7870-0283; http://lattes.cnpq.br/3716965047168777This study investigated the production of wood-plastic composites (WPCs) using Eucalyptus sp. residues (ER) from the Capixaba wood industry and poly(vinyl alcohol) (PVA), aiming to evaluate chemical, structural, physical, and mechanical properties, as well as to optimize sustainable formulations. The composites were produced with different proportions of residue (70%, 60%, and 40%) and PVA (30%, 40%, and 60%), along with two particle sizes (35 and 60 mesh). The results indicated that increasing the ER content enhanced the crystallinity and thermal stability of the composites, while PVA improved the adhesion between components. Composites with higher ER content preserved the structural and thermal characteristics of lignin and cellulose, whereas those with higher PVA content exhibited lower thermal stability. The 60% ER and 40% PVA ratio showed the best balance, combining thermal stability, adhesion, and homogeneity. In the physical analyses, composites with higher PVA content showed greater dimensional stability, despite presenting lower apparent density values. The mechanical results highlighted the composites with 60% ER and 40% PVA (T2 and T5) as the most resistant in tensile, compression, flexural, and impact tests. Particle size significantly influenced adhesion and material uniformity, with the 35 mesh size yielding better results compared to the 60 mesh. These findings demonstrate that WPCs are promising for sustainable applications, adding value to waste materials and contributing to the reduction of environmental impacts
- ItemSimulação e estimação em um processo de hipertermia com nanofluidos utilizando redes neurais informadas por física e filtro de partículas(Universidade Federal do Espírito Santo, 2025-02-26) Pedruzzi, Wancley Oinhos; Silva, Wellington Betencurte da ; https://orcid.org/0000-0003-2242-7825; http://lattes.cnpq.br/6900925458823632; Dutra, Julio Cesar Sampaio; https://orcid.org/0000-0001-6784-4150; http://lattes.cnpq.br/5331990513570911; https://orcid.org/0009-0008-5461-9075; http://lattes.cnpq.br/5567607430921292; Barañano, Audrei Gimenez ; https://orcid.org/0000-0002-0174-5202; http://lattes.cnpq.br/6155024776819193; Bermeo Varon, Leonardo Antonio ; https://orcid.org/0000-0002-8078-716X; http://lattes.cnpq.br/4417772166132737Hyperthermia is a promising technique for cancer treatment, attracting significant interest from the scientific community. The use of metallic nanoparticles enables enhanced heat deposition in tumors when exposed to external energy sources, such as lasers. However, there are still challenges in accurately modeling heat transfer and estimating state variables, such as temperature and heat sources, during treatments. This study investigates the heating of a nanofluid in a simulated experiment, where a nanofluid containing palladium-ceria oxide (PdCeO2) nanoparticles is heated by a near-infrared diode laser. The study proposes and an alyzes two complementary models to describe the heating process. The first model describes heat transfer in a two-dimensional domain and employs Physics-Informed Neural Networks (PINNs) trained under different architectures, along with the finite volume method, using an implicit formulation for temporal interpolation and central differences for spatial gradients. The results are verified using COMSOL software and validated against experimental data, ensuring the accuracy of the approach. The second model represents the transient average temperature increase and combines a PINN with a particle filter for state estimation. The PINN solves the heat transfer model and acts as the state evolution model in the particle filter. Synthetic and real temperature measurements, obtained from nanofluid heating experiments, are used to solve the state estimation problem. The results demonstrate that the PINN-based approach accurately predicts various experimental conditions. Furthermore, the combination of PINNs and particle filters emerges as a promising tool for modeling and controlling thermal processes in biomedical applications, such as cancer thermotherapy
- ItemCaracterização e aplicação das fibras de Cyperus papyrus em compósito polimérico(Universidade Federal do Espírito Santo, 2024-08-29) Nascimento, Mateus Urbano do; Oliveira, Michel Picanço ; https://orcid.org/0000-0001-9241-0194; http://lattes.cnpq.br/6383844066460475; https://orcid.org/0009-0008-3032-8134; http://lattes.cnpq.br/5290180524562317; Pereira, Artur Camposo ; https://orcid.org/0000-0002-5882-9781; http://lattes.cnpq.br/9933475136538529; Moulin, Jordão Cabral ; https://orcid.org/0000-0002-5543-3853; http://lattes.cnpq.br/3577181658928552The growing environmental concern and the need for eco-efficient alternatives to structural materials have increased the demand for sustainable and innovative materials. In this regard, research and exploration of plant fibers for use in composites as a substitute for conventional forms have shown promise. In this context, this work aims to characterize and apply papyrus fibers (Cyperus papyrus) as a reinforcement element in a composite of epoxy resin with epoxidized soybean oil. The papyrus fibers were manually extracted from the plant and characterized in terms of their physical, chemical, thermal, morphological, and mechanical properties. Composites were produced from the fibers using an epoxy matrix incorporated with 20% epoxidized soybean oil, and three proportions of aligned fiber mass in the composites (10%, 20%, and 30%) were evaluated through chemical, thermal, and mechanical analyses. The fibers had an average diameter of 167.42 µm and a maximum tensile strength of 188.21 MPa. The crystallinity index of the fibers was 58.56%, and their thermal stability was 220°C. The best properties were achieved in the composites reinforced with 30% fiber, reflecting a mechanical improvement, with increases in tensile strength and modulus of elasticity of 133% and 630%, respectively, and thermal stability up to 262°C. However, the composites exhibited reduced deformation and toughness with the addition of fibers, indicating a more brittle nature. Thus, papyrus fibers demonstrated potential for use in composites and were effective in reinforcing the epoxy/epoxidized soybean oil matrix