Programa de Pós-Graduação em Engenharia Química - PPGEQ/ITEC

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2308

O Programa de Pós-Graduação em Engenharia Química (PPGEQ) do Insituto de Tecnologia (ITEC) da Universidade Federal do Pará (UFPA). Sendo aprovado pela CAPES / MEC em 1991, foi oficialmente iniciado em março de 1992.

Navegar

Agora exibindo 1 - 13 de 13

Acesso aberto (Open Access)
Ativação alcalina para a produção de geopolímeros a partir de resíduo industrial
(Universidade Federal do Pará, 2018-02-02) BRITO, Woshington da Silva; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
The sustainable construction of the future, and has low energy consumption and greenhouse gas emissions must also adopt the principle of reuse of wastes impacting the environment generated by the productive chain. The aluminum production chain has as one of the leading waste impact on the environment the gray generation. The present study focused on the research and development of a cement-based material. Refers to an inorganic polymer, formed by the activation of amorphous aluminosilicates (Al2O3. SiO2), which react in a strongly alkaline medium, called geopolymer. As a raw material furnace fly ash, mineral residue from the combustion of the boilers of the company of the municipality of Barcarena-PA; As a source of aluminosilicate, and the kaolin that underwent the process of burning at 800 ºC that became metakaolin; And the alkaline medium of sodium silicate (Na2SiO3) and sodium hydroxide (NaOH), used as activators. As fly ash partially crystallizes during burning and loses some of its amorphous state, so are its reactive properties to chemically combine during the geopolymerization reaction are reduced. To increase reactive properties of fly ash and added metakaolin. As the main analyzes, no X-ray diffraction (XRD), X-ray fluorescence (FRX), scanning electron microscopy (SEM) and EDS. Tests of resistance to compression of the traces in the hardened state were also carried out and the rheological test of the geopolymer was carried out at the start of the reaction in the fresh state. For Davidovits ratios in the range of 2.5 to 3.23, the best geopolymers with compressive strength were obtained reaching 25 MPa in 24 hours of cure. For 60 days of cure at room temperature the geopolymers reached a resistance of 45, 36 MPa. The research carried out through the characterization analysis of the samples and the mechanical and rheological tests were presented in a satisfactory way and demonstrated that the residues of fly ash and metakaolin, when activated with sodium silicate and sodium hydroxide, are an alternative for the possible application of Geopolymer materials in construction.
Acesso aberto (Open Access)
Avaliação da formação zeolítica em sínteses com diferentes proporções de Si/Al via processo hidrotermal a partir de caulim durp (flint)
(Universidade Federal do Pará, 2023-02-23) FERREIRA, Aline Lopes; PINHEIRO, Alice dos Prazeres; http://lattes.cnpq.br/6671972168040423; MACÊDO, Emanuel Negrão; http://lattes.cnpq.br/8718370108324505
The zeolite synthesis is composed of several reactional factors, in which changing a condition can significantly modify the intensity trend of the zeolite crystals or even the type of zeolite formed. In this context, this work aims to explore the change in the Si/Al ratio in different time periods and analyze the formed product. Initially, the characterization of hard kaolin was carried out through FRX, DRX, MEV, TG, DTG and DSC analyses. Subsequently, the hard kaolin was calcined at 650 °C for 2 hours, with the aim of transforming the starting material into metakaolinite, facilitating the restructuring into zeolite in the reaction medium of the dynamic hydrothermal process. Altogether, 7 hydrothermal syntheses with different Si/Al ratios were carried out, each lasting 6 hours. In each synthesis, aliquots were removed every half hour and filtered, the liquid of which was used to carry out the titration, while the particulate material from the period of 1, 2, 4 and 6 hours was applied for verification in the X-Ray Diffractogram (DRX) and MEV. In all products, the crystalline phases referring to zeolite A, sodalite and in some points of faujasite and cancrinite were observed. In view of the data obtained, it was verified that all the compositions used had satisfactory results with zeolite formation from 1 hour of synthesis, that is, a short period of time. Furthermore, it was possible to verify in a visible way, through the intensity of the peaks and appearance or disappearance of zeolite types, the interference of time and the proportion of Si/Al in the medium. In addition to the XRD, the dendrogram analysis was used in order to identify clusters, that is, which products had similar characteristics, being able to analyze intervals of better formation. The MEV was carried out with the 1-hour material, verifying the characteristic morphology of zeolite A and sodalite, mainly in the proportions of Si/Al=1 and 1,5. The concentration of NaOH in the medium, verified by titration, showed little consumption of this reagent throughout the synthesis. However, it was concluded that the reaction conditions applied to the hard kaolin showed the capacity to form zeolites, allowing the verification of the formation.
Acesso aberto (Open Access)
Dinâmica molecular de armazenamento de H2 em nanotubos de carbono sob ação de campo elétrico externo
(Universidade Federal do Pará, 2016-01-27) AIRES, Júlio Cesar Nunes; CHAVES NETO, Antônio Maia de Jesus; http://lattes.cnpq.br/3507474637884699; https://orcid.org/0000-0002-9730-3512
Several thermodynamic properties were analyzed through computer simulations systems, in which we used a carbon nanotube a gas molecule (H2), the very low initial temperature of 10-3K order. This H2 molecule was chosen because of its properties are of great application in different branches of study, the physical sciences, chemical and biological. The H2 molecule is individually relaxed inside and outside the nanotube during simulations. Each system was under the influence of a uniform electric field parallel to the carbon nanotube and the thermal effect on the initial temperature in the simulations generating the evanescent effect. Due to the electric field, the molecule rotates at a low temperature in orbit about the carbon nanotube while increasing the value of the electric field permitted the variation of the radius of the orbit atoms. The calculated amounts were the following: kinetic energy, potential energy, the total energy, temperature variation in situ, the molar entropy and the mean radius of the orbit atoms. The data suggest the action of the electric field is sufficient only to generate the evanescent attractive potential and this system can be used as a sensor selector atoms.
Acesso aberto (Open Access)
Estudo da influência do óxido de cálcio nas reações de estado sólido na produção de agregado cerâmico a base de aluminossilicatos e resíduo do processo Bayer
(Universidade Federal do Pará, 2023-02-10) BRITO, Carlos Eduardo Costa; SOUSA, Jose Antonio da Silva; http://lattes.cnpq.br/6157348947425968; MACÊDO, Emanuel Negrão; http://lattes.cnpq.br/8718370108324505
The most important worry involving the generation of industrial waste is associated with the effects those materials can have on the environment and human health, considering that the dangerous waste produced by the industry requires particular care and attention, because if managed improperly, it can become a serious environmental threat. Therefore, this paper demonstrates the studies conducted to recycle the residue from the Bayer process, as a raw material in the production of synthetic aggregate, intended for civil construction. Furthermore, this paper has analyzed the influence of calcium oxide in the solid state reactions during sintering in the production of ceramic aggregates based on residue from bauxite processing because this oxide, besides being a melting material, also influences the formation of glass with lower viscosity, and may positively influence the mechanical strength of the material. For the conformation of the aggregates a composition based on bauxite residue and silica was adopted with and without the addition of calcium oxide. The pellets were produced in a rotating cylinder and sintered at temperatures of 1180, 1200 and 1250 °C with a burn time of 3 hours. For the characterization of the raw materials the techniques of X-ray Fluorescence (XRF), X-ray Diffraction (XRD), Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TG) were employed. For the characterization of the aggregate, scanning electron microscopy (SEM), XRD and DSC tests were performed on the formulations composed of bauxite residue and clay with and without the addition of calcium oxide. The physical and technological properties determined were: Water absorption, apparent porosity and apparent specific mass. The results of this paper indicate that bauxite residue can be used as a source of alternative raw material for the production of synthetic ceramic aggregate. The results obtained also prove that the use of calcium oxide directly influenced the solid state reactions, especially in the mullite formation reaction. Therefore, the production of synthetic aggregate with the addition of calcium oxide proved to be a promising destination for the Bayer process residue.
Acesso aberto (Open Access)
Fotocatalisadores de dióxido de titânio dopados com metais de transição: síntese, caracterização e aplicação na fotodegradação de fármacos
(Universidade Federal do Pará, 2024-12-27) AZEVEDO, Carla Arnaud de; FARIA, Lênio José Guerreiro de; http://lattes.cnpq.br/7428609361678173
Heterogeneous photocatalysis has shown promise in ecological remediation and in the adequate treatment of pharmaceuticals as emerging contaminants. This study evaluated the photocatalytic activity of materials synthesized from the modification of the TiO₂ surface with transition metals (copper and cobalt) at concentrations of 0.5% and 1.5%, analyzing the physical, chemical and textural properties of the materials by N2 physisorption (BET) analysis, X-ray diffractometry (XRD), scanning electron microscopy–energy-dispersive X-ray spectrometry (SEM-EDS) and Fourier transform infrared (FT-IR). The experimental tests were carried out in an annular photoreactor with UV mercury lamp, following the Box-Behnken design, to evaluate the influence of catalyst mass (50 – 150 mg.L-1 ), drug concentration (2 – 8 mg.L-1 ) and irradiation time (60 – 120 min) on the photodegradation of acetaminophen (ACT) and diclofenac sodium (DCF). The BET results indicated that the materials have a mesoporous structure with an average pore diameter of 14.52 nm. XRD characterization confirmed the mixed structure of anatase and rutile and the absence of metal oxide peaks. The SEM-EDS analysis revealed irregular surfaces formed by misshapen grains and small particles attributed to metal oxides. The FT-IR showed O-H and Ti-O stretching bands, characteristic of photocatalytic materials. The FTCu1.5 photocatalyst was chosen for use in the photodegradation tests of the drugs due to its surface area, porosity and good anatase and copper content. The photocatalysis tests, in comparison with the photolysis tests, showed superior results, evidencing the functionality of the photocatalyst used. The degradation percentages reached 100% for both drugs and the concentration of the pollutant solution had a negative effect on the response variables, indicating that degradation increases with the reduction of the initial concentration of this solution. The proposed polynomial models presented a coefficient of determination (R²) > 0.9 and good predictive capacity. The Response Surface Methodology (RSM) and Desirability Function analyses indicated that it is possible to obtain a substantial reduction in the amount of photocatalyst used, when combined with an adequate adjustment in the irradiation time. The optimal conditions within the experimental domain for ACT are mcat = 100 mg.L-1 , CFA = 2 mg.L-1 and tIRR = 75 minutes, resulting in EffACT(%) = 99.05% and for DCF, the optimal conditions were mcat = 72 mg.L-1 , CFA = 2 mg.L-1 and tIRR = 65 minutes, resulting in EffDCF(%) = 90.39%. The developed photocatalyst significantly degraded the drugs and demonstrated promise for photocatalysis applications.
Acesso aberto (Open Access)
Influência da temperatura de calcinação na redução da hematita e na liberação do titânio na lama vermelha (resíduo do processo bayer)
(Universidade Federal do Pará, 2016-12-26) VIEGAS, Bruno Marques; MAGALHÃES, Edilson Marques; CV: http://lattes.cnpq.br/1570353513360972; MACÊDO, Emanuel Negrão; http://lattes.cnpq.br/8718370108324505
In this work a technological route was proposed aiming at the reduction of hematite to magnetite and the release of titanium present in red mud from Hydro Alunorte. The fluorescence and x ray diffraction analysis showed that the red mud presents in their composition approximately 5% of titanium oxide as anatase and 28% of iron oxide in the forms of hematite and goethite. Therefore, the proposed route will enable the obtainment of a material with magnetic characteristics which can be used as source of titanium after extraction of iron compounds in magnetic form. So, the reduction of the hematite to the magnetite was carried out by thermal treatment in a reducing atmosphere. To accomplish this, mixtures were made in different concentrations of red mud and charcoal. These mixtures were calcined at temperatures of 500, 600 and 1000 ° C for two hours. Then, X ray diffraction analysis were performed, which showed that the hematite was reduced to magnetite in all experimental conditions and, for the mixtures calcined at 1000 ° C, besides the formation of the magnetite, there was also the formation of maghemite. Through analysis of Raman spectroscopy and scanning electron microscopy, it was verified that for calcination temperatures of 500 to 600° C titanium remained in the free form of anatase, but for the calcination carried out at 1000° C this passed to the combined form with iron (ilmenite). The technological route allowed the formation of magnetite from the red mud, which can be extracted with the use of a magnetic separator.
Acesso aberto (Open Access)
Inserção da temperatura no modelo de Langmuir aplicado na adsorção de íons cobre por zeólita 5A : experimental e estatística Bayesiana
(Universidade Federal do Pará, 2025-02-05) SOUSA, Ana Paula Souza de; RODRIGUES, Emerson Cardoso; http://lattes.cnpq.br/7459428211048580; HTTPS://ORCID.ORG/0000-0002-0303-4578; ESTUMANO, Diego Cardoso; http://lattes.cnpq.br/5521162828533153; https://orcid.org/0000-0003-4318-4455
The treatment of wastewater contaminated by heavy metals represents a significant environmental challenge, with adsorption being one of the main approaches for removing these contaminants, as it exhibits high efficiency in molecular separation. Understanding the interaction between adsorbent and adsorbate is essential for predicting dynamics under different operational conditions. Thus, the use of modeling techniques in isotherm prediction allows for estimating adsorption performance, reducing the need for intensive experimentation, while promoting process optimization. Considering these factors, this work aimed to develop a predictive model capable of estimating adsorption isotherms of copper ions by zeolite 5A at different temperatures. The methodology involved the production and characterization of kaolin waste, metakaolin, and the zeolitic product, utilizing characterization techniques such as X-ray Fluorescence Spectrometry (XRF), X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and thermal analyses, including Thermogravimetry (TG), Differential Thermogravimetry (DTG), and Differential Scanning Calorimetry (DSC), to determine the chemical and mineralogical composition, morphology, and thermal stability of the material. Adsorption isotherms of copper ions were performed at temperatures of 25 ºC, 35 ºC, 45 ºC, 55 ºC, 65 ºC, 75 ºC, 85 ºC, and 95 ºC. To study the adsorption mechanisms and the adsorbent/adsorbate interaction, the Markov Chain Monte Carlo (MCMC) method with the Metropolis-Hastings algorithm was used to estimate model parameters and subsequently fit them to the experimental data. Based on these data, the Langmuir model was adapted to incorporate temperature, in the range of 25 ºC to 150 ºC, followed by the calibration, validation, and prediction of adsorption dynamics. The characterization results confirmed the potential use of kaolinitic waste for zeolite synthesis, as well as the successful formation of zeolite 5A through its chemical composition, mineralogy, and morphology. The isotherms revealed that copper removal capacity increased proportionally with temperature, obtaining a maximum adsorption capacity of 754.85 mg/g at 95 ºC. The parameter estimation validated the adaptation of the Langmuir model for different thermal conditions, which proved effective in predicting the isotherms, optimizing the adsorption process at different temperatures, and providing a good model estimate, thus enabling the reduction of extensive experimental activities.
Acesso aberto (Open Access)
Modelagem, simulação e estimação dos parâmetros por MCMC de um modelo que descreve a dinâmica de adsorção em uma coluna de leito fixo
(Universidade Federal do Pará, 2023-01-18) SOEIRO, Wilhamis Fonseca; VIEGAS, Bruno Marques; http://lattes.cnpq.br/1196600058247902; HTTPS://ORCID.ORG/0000-0002-2768-652X; ESTUMANO, Diego Cardoso; http://lattes.cnpq.br/5521162828533153; https://orcid.org/0000-0003-4318-4455
The treatment of industrial effluents is extremely important for both the environment and human health. The purification of water from polluting components, such as metals and organic compounds, for reuse in the industrial process can be considered one of the main applications in this field. Therefore, there is interest in modeling one of the most used treatment processes, adsorption. Aiming to describe the dynamics of the process in an adsorption column, in this work the method of lines and the pdepe function (matlab) are used to solve the model formed by the mass balance in the liquid phase, linear driving force equation (LDF) and the Langmuir isotherm for equilibrium. An evaluation of the model varying some experiment conditions was carried out, from which results congruent with those found in the literature were observed. In addition, a sensitivity analysis of the phenomenon was carried out in relation to the parameters: Langmuir constant, intraparticle mass transfer coefficient and axial dispersion coefficient. Subsequently, these parameters were estimated using the Monte Carlo technique via Markov chain (MCMC) using experimental data found in the literature. Finally, in general, the estimates were good enough to represent the adsorption dynamics of the evaluated experiments.
Acesso aberto (Open Access)
Produção de material zeolítico em escala semi piloto com o calor proveniente da dissolução de hidróxido de sódio
(Universidade Federal do Pará, 2025-02-05) LIMA, Haianny Beatriz Saraiva; COSTA, Deibson Silva da; http://lattes.cnpq.br/1521124351431087; HTTPS://ORCID.ORG/0000-0002-2165-2628; ESTUMANO, Diego Cardoso; http://lattes.cnpq.br/5521162828533153; https://orcid.org/0000-0003-4318-4455
The increasing demand for zeolitic materials, due to their high adsorption capacity, selectivity, and ion exchange, highlights the need for more efficient and sustainable production methods. Thus, the study aimed to produce zeolites on a semi pilot scale from kaolin waste, utilizing reactive heat for hydrothermal synthesis and applying these zeolites for copper ion adsorption. The methodology involved drying, disaggregation, and calcination of the kaolinitic waste, followed by the synthesis of the zeolitic material. Characterization of the materials was performed using X-ray Diffraction (XRD), X-ray Fluorescence (XRF), Scanning Electron Microscopy (SEM), and Thermogravimetric Analysis (TGA), Differential Thermogravimetric Analysis (DTG), and Differential Scanning Calorimetry (DSC). Subsequently, equilibrium isotherms were conducted at temperatures of 25 ºC, 35 ºC, 45 ºC, 55 ºC, 65 ºC, 75 ºC, 85 ºC, and 95 ºC, along with parameter estimation to study the adsorption mechanisms and the adsorbate/adsorbent interface. Additionally, modeling of the adsorption process for hydrogen sulfide (H2S) and carbon dioxide (CO2) gases was carried out, using experimental data from the literature and employing analytical breakthrough curve models to describe the adsorption phenomenon in continuous flow. The results confirmed the predominant presence of kaolinite in the waste, the efficiency of the calcination process, and the formation of zeolitic material, evidenced by the mineralogical and chemical composition, as well as the cubic morphology characteristic of zeolite 4A and the spherical shapes of sodalite. Thermal analyses elucidated changes associated with water loss and phase transitions. Adsorption tests demonstrated that the produced material was effective in removing copper ions, with a maximum amount adsorbed of 782,76 mg/g at 95 ºC, indicating a good interaction between the adsorbent and the adsorbate. Furthermore, the use of Bayesian techniques for parameter estimation in isotherm and breakthrough curve models enabled a better understanding of the process dynamics. Finally, this study demonstrated the feasibility of producing zeolites from kaolin residue on a semi-pilot scale using reactional heat, offering an approach that is less harmful to the environment and reduces costs through the reuse of industrial waste and energy optimization of the process.
Acesso aberto (Open Access)
Simulação da separação e purificação do biodiesel de óleo de palma com CO2 supercrítico
(Universidade Federal do Pará, 2016-07-11) GONÇALVES, Aline Lobato; ARAÚJO, Marilena Emmi; http://lattes.cnpq.br/8983914018546682
Biodiesel has attracted growing attention worldwide in recent years. The production of biodiesel from biomass involves separation and purification steps. The method generally used, the aqueous washing, has major disadvantages such as the generation of wastewater and forming emulsions. The objective of present work is to investigate the biodiesel purification using carbon dioxide, which in supercritical conditions has properties capable of separating glycerol phase of esterified phase (biodiesel), providing higher quality products and less waste. In this study, two simulations were used for analysis and investigation of purification of crude palm oil biodiesel. Both configurations conventionally designed the project process via ethylic route by basic catalysis to the reaction step. The "case 1" used a fractional distillation column for separating excess ethanol and a liquid-liquid column extraction using water as solvent for the separation of glycerol. The "case 2" applied a fractionating column in countercurrent, used for the glycerol separation step, carbon dioxide as supercritical solvent and for separating excess of ethanol, a flash vessel in the final purification of biodiesel. The simulator employed was Aspen HYSYS V8.4 that used binary parameters, adjusted with the equations of state of Soave-Redlich-Kwong (SRK) and Redlich-Kwong-Aspen (RK-ASPEN) to study systems, performed the simulations appropriately. The supercritical CO2 proved to be efficient in the separation of glycerol, given that biodiesel produced with this purification technology met the ANP main standards rules.
Acesso aberto (Open Access)
Simulação do escoamento EMHD de um fluido micropolar em um duto quadrado utilizando a técnica da transformada integral generalizada
(Universidade Federal do Pará, 2023-04-28) SOUZA, Andreo Carlos Magalhães; MIYAGAWA, Helder Kiyoshi; http://lattes.cnpq.br/5848592858919971; HTTPS://ORCID.ORG/0000-0001-9346-4696; QUARESMA, João Nazareno Nonato; http://lattes.cnpq.br/7826389991864785; https://orcid.org/0000-0001-9365-7498
This paper aims to perform the kinetic, microrotational and thermal analyses of an electromagnetohydrodynamic (EMHD) flow of a micropolar fluid within a quadratic section duct subjected to an external magnetic field, where the mathematical formulation takes into account a pulsatile pressure difference. The flow is transient, two-dimensional in laminar regime and has constant physical properties. The resulting nonlinear differential equations (Navier-Stokes Equation, Microrotation Equation and Energy Equation) were solved using the hybrid (analytic-numerical) GITT (Generalized Integral Transform Technique) technique and a computer code was synthesized in Wolfram Mathematica v. 11.3 software with the objective of numerically solving the proposed model. Aiming to analyze the consistency of the technique, the convergence analysis of the variables central velocity, central microrotation, central temperature, average velocity, average temperature, wall stress and Nusselt number was initially performed. Next, the numerical verification of the method is presented by comparing the results of GITT with that of the NDSolve routine of the software used. The analysis of the parameters involved in the flow (Strouhal number, Hartmann number, Prandtl number, Eckert number, electrical parameter, micropolarity parameter, mean pressure gradient, microrotation viscosity and pressure pulse frequency) and the physical interpretation of the variation of each of them is also performed.
Acesso aberto (Open Access)
Síntese de sodalita para adsorção utilizando como fonte de calor a variação de entalpia de dissolução dos reagentes
(Universidade Federal do Pará, 2016-12-29) COELHO, Danilo dos Santos; ROCHA JUNIOR, Carlos Augusto Ferreira da; http://lattes.cnpq.br/9333542718006007; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
Zeolites are ceramic materials formed by four oxygen atoms enclosing a cation, rearranged in interconnected tetrahedra and presenting channels and "cages" as a framework of open cavities, normally occupied by water molecules and extra-structural cations capable of ion exchange. The objective of this work was to synthesize sodalite zeolite from filler kaolin (CE) with the use of heating mantle and / or heat dissolution of sodium hydroxide and sodium silicate, as well as to evaluate the energy cost of zeolite synthesis Only with heat of dissolution and thus to elaborate through the material synthesized pellets of varied composition of sodalite, and other materials like treated clay, charcoal and hair in order to study the effect on the efficiency in the adsorption of water vapor and copper ion . The zeolite used for the conformation of the pellets was synthesized using calcined filler kaolin at 600 ° C, sodium hydroxide and silicate and distilled water. The zeolitic products as well as the starting materials were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Thermal Analysis (DSC, DTG, TG). From the reaction conditions studied it was possible to obtain zeolitic material in the short time 3, 6, 9, 12, 15 min using dissolution heat and 30 and 60 min using dissolution heat and heating mantle. Through the zeolitic material obtained, as well as its pellets, water vapor adsorption tests were carried out in systems with and without moisture control, as well as copper ion adsorption in which the final concentration was measured in Uv-1800 model spectrophotometer. The results showed that the adsorption of water vapor with and without moisture control applying pulverized sodalite and pellets had statistically similar values. The adsorption of the copper ion had a good efficiency when compared to other studies available in the literature.
Acesso aberto (Open Access)
Soluções híbridas com uso de transformadas integrais na análise do escoamento em mancais de escora circulares
(Universidade Federal do Pará, 2014-12-15) MEDEIROS, Nielson Veloso; QUARESMA, João Nazareno Nonato; http://lattes.cnpq.br/7826389991864785; https://orcid.org/0000-0001-9365-7498
This paper explores the modeling and solution of the Reynolds equation and simulate the problem of hydrodynamic lubrication in bearings of circular anchor shoes with Rayleigh and milled pad. Mathematical modeling of the problem of hydrodynamic flow in bearings with consideration of centrifugal inertial terms produces a modified generic equation Reynolds called Reynolds equation with inertial terms version. This equation is solved by the generalized integral transform technique (TTIG) method, where it transforms the Reynolds equation system for generating a common, endless and non- linear equations for obtaining the analytical and numerical solutions of the field of fluid film pressure, the charge and power consumed by the bearing, where these performance parameters depend on the geometry adopted for the bearing. Thus, four algorithms were originated by the transformed system, and the difference between them are the geometries chosen for the bearings, but all computer codes made use of the traditional way of TTIG. In all codes were implemented in Fortran 90/95 language and solved by routine BVPFD of IMSL (1987) library. The solution to said Reynolds equation expressed using the work dimensionless transfer potential P(r,) that was found for various combinations of dimensionless coefficients that constitute the terms of this equation. The applicability of the technique was verified by comparing the results from the use of GITT the values found by the finite volume method (FVM) in a paper published by Blanco e Prata, 1998 e 2014. Behavior of pressure fields was verified by varying the sizes of the series obtained by computer codes. The results show reasonable convergence.

Navegar

Navegando Programa de Pós-Graduação em Engenharia Química - PPGEQ/ITEC por Linha de Pesquisa "ENGENHARIA DE PROCESSOS INORGÂNICOS"