Dissertações em Engenharia Química (Mestrado) - PPGEQ/ITEC
URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/2309
O Mestrado Acadêmico iniciou-se em 1992 e pertence ao Programa de Pós-Graduação em Engenharia Química (PPGEQ) do Instituto de Tecnologia (ITEC) da Universidade Federal do Pará (UFPA).
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Navegando Dissertações em Engenharia Química (Mestrado) - PPGEQ/ITEC por Orientadores "QUARESMA, João Nazareno Nonato"
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Item Acesso aberto (Open Access) Modelagem e simulação do processo de separação por membrana difusa polimérica para a extração de metais(Universidade Federal do Pará, 2007-02-16) CARDOSO, Simone de Aviz; QUARESMA, João Nazareno Nonato; http://lattes.cnpq.br/7826389991864785Metal extraction process using polymeric membranes is analyzed by using the lines-Gear method in the solution of the related equations of specie conservations. The mathematical modeling of the physical problem is done by considering the diffusion process of metals in polymeric membranes in order to extract metals, such as Cd (II), Au (III) and Pd (II) from acid solutions. Therefore, the behavior of concentration profiles of metals to be extracted from the feeding phase is discussed in the light of the influence of relevant parameters in the extraction process, such as, composition and thickness of the membrane, diffusion coefficient and constant extraction. Comparisons with previously reported results in the literature for typical situations are also performed. The obtained results were very satisfactory when they were compared with other found results in the literature.Item 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/0000-0001-9365-7498This 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.Item Acesso aberto (Open Access) Solução híbrida da equação de advecção-dispersão em meios porosos(Universidade Federal do Pará, 2013-03-21) SILVA, Elizeu Melo da; QUARESMA, João Nazareno Nonato; http://lattes.cnpq.br/7826389991864785This work consists of the hybrid solution of one-dimensional Advection-dispersion Equation for solute in porous media heterogeneous or homogeneous, single component, with coefficients of retardation, dispersion, average speed, production and decay depend on distance traveled by the solute. We will study the cases where dispersion-advection retardation, dispersion, flow rate, production and decay vary linearly as dispersivity assume linear, parabolic or exponential. For the solution of the equation was applied to Generalized Integral Transform Technique. The results obtained in this work show good agreement between the sample problems and their analytical or numerical solutions in the literature and indicate a better match in the use of models in the study of parabolic advection-dispersion in short time, while the linear model converges faster in times of prolonged simulation. The convergence of the series proved to have direct dependence on the length of the field, the dispersion model and dispersivity adopted, converging with terms up to 60, reaching NT = 170, for the heterogeneous cases, using the model of exponential dispersion respecting the criterion adopted 10-4.Item 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/0000-0001-9365-7498This 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.Item Acesso aberto (Open Access) Soluções híbridas por transformadas integrais para o escoamento magnetohidrodinâmico com transferência de calor em canais de placas paralelas(Universidade Federal do Pará, 2015-06-26) PONTES, Fábio de Andrade; QUARESMA, João Nazareno Nonato; http://lattes.cnpq.br/7826389991864785The present study is to analyze the dynamics of the magnetohydrodynamic flow of electrical conductors newtonian fluids within a parallel flat plate channel subjected to a uniform external magnetic field, wherein the mathematical formulation of the model is given in terms of stream-function, obtained from the Navier-Stokes equations and the Energy Equation. The adopted assumptions are steady state, laminar and incompressible flow and constant physical properties. It is also admitted that the external magnetic field applied in the normal direction of flow remains uniform, not being thus influenced by any internal magnetic effect. For the solution of the governing equations, the Generalized Integral Transform Technique (GITT) is applied to this system of partial differential equations and a hybrid solution (numerical and analytical), which is computationally implemented using the programming scientific language FORTRAN 90. In order to illustrate the consistency of the integral transformation, convergence analysis is performed and presented. Results for velocity and temperature fields as well as potential correlates are generated and compared with the literature on the basis of the main parameters of government. An in-depth analysis of parametric sensitivity of the main dimensionless parameters such as the Reynolds number, Hartmann number, Eckert number, electric parameter and Prandtl number for some typical situations is performed.Item Acesso aberto (Open Access) A técnica da transformada integral generalizada no escoamento em dutos bidimensionais de geometria irregular na forma senoidal(Universidade Federal do Pará, 2014-02-28) MIYAGAWA, Helder Kiyoshi; QUARESMA, João Nazareno Nonato; http://lattes.cnpq.br/7826389991864785The Generalized Integral Transform Technique is applied solve the Navier-Stokes equations for an irregular geometry duct in sinusoidal shape in an incomprehensible and laminar flow. The formulation was used in terms of current function. A general filter has been adopted that adapts to the irregular contour to increase the convergence of the solution. Different geometries were analyzed by modifying the length ratio (λ/a) and the height ratio (Hmin/Hmax) for Reynolds number in the range 25-400. For the same Reynolds number rising one of the two geometrical parameters the flow recirculation is lower and the decrease of the parameters increases the flow recirculation. The recirculation for λ/a = 16 and Hmin/Hmax = 0.7 is low in Reynolds = 400. Considering the configuration where λ/a = 4 and Hmin/Hmax = 0.3 the flow recirculation is observed at low Reynolds numbers (Re = 25). The friction factor, based on the viscous forces, calculated showed the same pattern of the literature.