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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Submissões Recentes
- 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
- ItemCasca de café como recurso renovável para a produção de celulases via fermentação em estado sólido com Aspergillus fumigatus(Universidade Federal do Espírito Santo, 2024-04-23) Vasconselos, Patrícia Garcia; Coelho, Jussara Moreira; https://orcid.org/; http://lattes.cnpq.br/; Co-orientador2; https://orcid.org/; http://lattes.cnpq.br/; Silva, Wellington Betencurte da ; http://lattes.cnpq.br/; Orientador2; https://orcid.org/; http://lattes.cnpq.br/; https://orcid.org/; http://lattes.cnpq.br/; Dutra, Julio César Sampaio ; https://orcid.org/; http://lattes.cnpq.br/; Carvalho, Raquel Viera de ; https://orcid.org/; http://lattes.cnpq.br/; Maitan-Alfenas, Gabriela Píccolo ; https://orcid.org/; http://lattes.cnpq.br/; 4º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 5º membro da banca; https://orcid.org/; dc.contributor.referee5Lattes; 6º membro da banca; https://orcid.org/; http://lattes.cnpq.br/; 7º membro da banca; https://orcid.org/; http://lattes.cnpq.br/Coffee is one of the main commodities produced by Brazil, and during the processing of the fruits, approximately 50% of the It are discarded in the form of waste. An alternative for reusing this residue is its application as a substrate in solid state fermentation (SSF) to obtain products with high added value, such as cellulases. In this context, the present work aimed to evaluate the potential of fresh coffee husk and pre-treated by alkaline solution in microwave, as an inducer in the production of cellulases by SSF using the fungus Aspergillus fumigatus. Cultivation conditions related to moisture content (50 – 70 %) and substrate content (60 – 80 %) were evaluated using a DCCR experimental design. Tests with in natura and pre-treated CC obtained FPase activities of 1,046 U/gms and 2,315 U/gms, respectively, after 120 hours of FES under conditions of 70 % CC and 70% humidity. Statistical analyzes demonstrated that moisture content is the parameter with the greatest influence on cellulase production by A. fumigatus, and conditions of 68 to 70% provide greater FPase activities. Enzymatic partial characterization showed that the crude enzyme extract has stability under conditions of pH 5 – 6 and 40 – 60 °C. In addition, Cu2+ , Co2+ , and Mn2+ ions can be used as cofactors. The enzymatic hydrolysis test of CC with the crude enzyme extract provided 1,5 g/L reducing sugars after 48 hours. These results highlight the potential of cellulases produced by A. fumigatus for industrial applications
- ItemAnálise da cinética de decomposição térmica da casca de urucum (bixa orellana l.)(Universidade Federal do Espírito Santo, 2024-05-28) Breciani, João Guilherme Fraga; Sousa, Robson Costa de; Costa, Ariany Binda Silva; https://orcid.org/0000-0001-7320-3317; https://orcid.org/; http://lattes.cnpq.br/; Carvalho, Romero Florentino de; https://orcid.org/; http://lattes.cnpq.br/; Alves, Rejane Costa; https://orcid.org/; http://lattes.cnpq.br/; Perazzini, Maisa Tonon BittiThis study aims to investigate the drying kinetics and thermal decomposition of annatto husks (Bixa orellana L.) in a nitrogen atmosphere. The analysis was performed through physical-chemical, thermal, and thermodynamic characterizations of the residue. Based the data obtained from the physico-chemical characterization, the residue's energy potential was verified, showing a low ash content and high calorific value. The thermal characterization was carried out using thermogravimetric analysis of the residues at different heating rates, which allowed for the determination of the material's peak, ignition, and burnout temperatures during the pyrolysis process. From this data, a drying kinetics study was performed, where the Page model provided the best fit to the experimental data. Additionally, the thermal decomposition kinetics of the material was studied using global and multicomponent models. Among the global models, Friedman, FWO, KAS, and Vyazovkin models were analyzed, but none were suitable for experimental representation. For the multicomponent models, consecutive reactions and independent parallel reactions were analyzed, both showing excellent fits, with TG deviations below 2.6% for all heating rates analyzed. Finally, in the thermodynamic characterization, the values of enthalpy, Gibbs free energy, and entropy indicate that the thermal decomposition of annatto husks in a nitrogen atmosphere is an endothermic and non-spontaneous process.
- ItemEstudo numérico da aplicação do sistema gerador de nitrogênio para remoção de depósitos de parafina(Universidade Federal do Espírito Santo, 2024-04-24) Cavalcante, Rafael Ferreira; Dutra, Julio Cesar Sampaio ; https://orcid.org/0000-0001-6784-4150; http://lattes.cnpq.br/5331990513570911; Silva, Wellington Betencurte da ; https://orcid.org/0000-0003-2242-7825; http://lattes.cnpq.br/6900925458823632 ; https://orcid.org/0009-0005-5585-071X ; http://lattes.cnpq.br/2615634585069482 ; Estumano, Diego Cardoso ; https://orcid.org/0000-0003-4318-4455; http://lattes.cnpq.br/5521162828533153; Abreu, Luiz Alberto da Silva ; https://orcid.org/0000-0002-7634-7014; http://lattes.cnpq.br/2157391120883842Offshore oil exploration has significant challenges, including the formation of hydrate and paraffin wax deposits, causing billionaire losses to the oil and natural gas industry. The nitrogen generating system (SGN) is a thermal and chemical technique applied to remove these deposits, employing an exothermic chemical reaction that promotes paraffin wax melting. Pipe-in-pipe (PIP) systems with thermal insulation layers are common in this scenario, aiming to optimize the system’s thermal efficiency. This dissertation conducts to a numerical study of an SGN application in a multilayer PIP system with paraffin wax blockage, to investigate the efficiency and feasibility of the technique in removing the deposit without compromising the PIP’s insulation materials. The mathematical formulation yields to a nonlinear transient two dimensional heat conduction model with chemical reaction and phase change. The solution of the transient problem employs the explicit Euler method for time integration, with spatial derivatives computed directly from the temperature nodal values. The results demonstrate that the SGN’s chemical reagents are quickly consumed, generating a high amount of heat, sufficient to remove the paraffin wax deposit. The simulation reaches a liquid fraction of 0.95. The results also show that the temperature of the thermal insulation layers exceeds their ideal working temperature, but remains below their melting point, reaching 140 ◦C in the innermost insulation layer. Additionally, the results indicate that the released heat is strongly dependent on the pH at which the reaction occur