Non Equilibrium Model
Mostrando 13-24 de 137 artigos, teses e dissertações.
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13. Development of Sliding Connections for Structural Analysis by a Total Lagrangian FEM Formulation
Abstract In this study a total lagrangian 2D finite element formulation is used to model plane frames developing large displacements and rotations considering sliding connections. This kind of connections is usually called prismatic and cylindrical joints. In order to be self-containing, the steps of the development of a frame finite element of any approxima
Lat. Am. j. solids struct.. Publicado em: 2016-11
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14. On the Validation of a Numerical Model for the Analysis of Soil-Structure Interaction Problems
Abstract Modeling and simulation of mechanical response of structures, relies on the use of computational models. Therefore, verification and validation procedures are the primary means of assessing accuracy, confidence and credibility in modeling. This paper is concerned with the validation of a three dimensional numerical model based on the finite element
Lat. Am. j. solids struct.. Publicado em: 2016-08
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15. MODELING AND ANALYSIS OF UNSTEADY FLOW BEHAVIOR IN DEEPWATER CONTROLLED MUD-CAP DRILLING
Abstract A new mathematical model was developed in this study to simulate the unsteady flow in controlled mud-cap drilling systems. The model can predict the time-dependent flow inside the drill string and annulus after a circulation break. This model consists of the continuity and momentum equations solved using the explicit Euler method. The model consider
Braz. J. Chem. Eng.. Publicado em: 2016-03
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16. Evaluation of Chemical Equilibrium and Non-Equilibrium Properties for LOX/LH2 Reaction Schemes
ABSTRACT: Nine chemical reaction models for equilibrium schemes and six chemical models for non-equilibrium ones are studied, considering different conditions found in real liquid oxygen/liquid hydrogen rocket engines. Comparisons between two eight-species models have shown that the most complex is the best one. Besides, it was also verified that the most co
J. Aerosp. Technol. Manag.. Publicado em: 2015-03
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17. NOVEL SIMILARITY-SOLUTION WHICH IS APPLICABLE FOR FREE CONVECTION OVER A BODY OF ARBITRARY SHAPE: THERMAL NON-EQUILIBRIUM IN A POROUS MEDIUM
Abstract The study of the natural convection flow and heat transfer from hot surfaces in a porous medium has been of considerable interest in energy-related engineering problems. This paper is concerned with the free convection heat transfer over an arbitrary hot surface in a porous medium. It is assumed that the fluid and solid phases are not in local therm
Braz. J. Chem. Eng.. Publicado em: 2015-03
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18. MODELING AND SIMULATION OF A BENZENE RECOVERY PROCESS BY EXTRACTIVE DISTILLATION
Abstract Extractive distillation processes with N-formylmorpholine (NFM) are used industrially to separate benzene from six carbon non-aromatics. In the process studied in this work, the stream of interest consists of nearly 20 different hydrocarbons. A new set of NRTL parameters was correlated based on literature experimental data. Both vapor-liquid equilib
Braz. J. Chem. Eng.. Publicado em: 2015-03
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19. Physical and geometrical non-linear analysis of plane frames considering elastoplastic semi-rigid connections by the positional FEM
This study presents an alternative Finite Element formulation based on positions to model plane frames considering geometrical non-linear and elastoplastic behavior for members and semi-rigid connections. The formulation includes shear effects and allows the consideration of important mechanical behavior of structures in design decisions and verifications. T
Lat. Am. j. solids struct.. Publicado em: 2014-12
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20. General exact harmonic analysis of in-plane timoshenko beam structures
The exact solution for the problem of damped, steady state response, of in-plane Timoshenko frames subjected to harmonically time varying external forces is here described. The solution is obtained by using the classical dynamic stiffness matrix (DSM), which is non-linear and transcendental in respect to the excitation frequency, and by performing the harmon
Lat. Am. j. solids struct.. Publicado em: 2014
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21. Estudo da desidratação da glicerina por destilação trifásica em coluna de pratos perfurados. / Study of the glycerine ion by three-phase distillation in sieve tray column.
A glicerina é um composto de grande utilidade em muitas áreas de aplicação. Atualmente, a maior fonte de glicerina é como subproduto da produção do biodiesel. Em 2010 o Brasil foi o segundo maior produtor de biodiesel no mundo com 2,4 milhões de m3. Estima-se que 10% da produção de biodiesel é glicerina bruta e destes 10%, aproximadamente entre 30
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/05/2012
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22. POLIMORFISMO DO GENE DA ENZIMA CONVERSORA DE ANGIOTENSINA EM INDIVÍDUOS HIPERTENSOS DO SUL DO BRASIL
The arterial hypertension is characterized as a multifactorial disorder, influenced by genetic and environmental factors. Environmental factors are most responsible for the accelerated growth of this disease. The physical exercise is considered a very important non pharmacological model of treatment for the hypertension. Actually, how much genes are studying
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 09/03/2012
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23. Aplicação do método da minimização da energia de Gibbs no cálculo de equilíbrio químico e de fases em sistemas eletrolíticos / Application method of the Gibbs energy minimization to calculation of phase and chemical equilibrium in electrolyte systems
In several industrial applications are used mixtures containing different solutes, often these solutes are non-volatile, such as electrolytes. The phase and chemical equilibrium in these processes occur in the various unit operations. The stages of production, as well as the separation and purification steps are critical to product quality. Thus, the calcula
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/12/2011
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24. Extensão do modelo Raise and Peel / Extension of the Raise and Peel model
O modelo raise and peel é um modelo estocástico unidimensional com absorção local e desorção não local. O modelo depende de um único parâmetro u que é a razão entre a taxa de absorção pela de dessorção. Em um valor especial deste parâmetro (u = 1) o modelo tem características interessantes. O espectro é descrito por uma teoria de campos con
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/07/2011