Convection Equation
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Modelagem do balanço de energia do dossel da cultura do pimentão em casa de vegetação. / Canopy energy balance modeling of sweet pepper cultivated in greenhouse.
In a greenhouse production system, the canopy of culture is the main element that modifies the internal microclimate. Its comprehension is very important to understand the energy exchange process. Due to the complexity interaction among several elements, the modeling represents an important tool for research in protected environments, but little used in Braz
Publicado em: 2005
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14. Modeling solute transport through unsaturated porous media using homogenization I
In this paper we consider homogenization of the diffusion, adsorption and convection of chemical species in porous media, that are transported by unsaturated single phase flows. The unsaturated flow is described by the Richards' equation. We present in details a rigorous derivation of the corresponding dual porosity model. Then we give the derivation by homo
Computational & Applied Mathematics. Publicado em: 2004-12
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15. Modelagem matematica e simulação numerica do refriamento rapido com ar forçado de morango
The temperature is one of the main factors that affects the fruits life after harvest. Increasing the temperature, speeds up the metabolism of the fruits, taking them to faster deterioration. One of the best ways to prevent the fruits of this kind of damage, is to apply the pre-cooling immediately after harvest, and to control the temperature during its st
Publicado em: 2004
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16. Analysis of the coupling between penalty method and pressure Poisson equation in convective problems.
The intent of this work is to analyse by means of numerical experiments the characteristics in terms of performance when the penalty method and the pressure Poisson equation formulation are combined to solve convective problems. Besides that, the penalty method and the pressure Poisson equation formulation are applied independently and compared with the coup
Publicado em: 2003
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17. Covalidation of Integral Transforms and Method of Lines in Nonlinear Convection-Diffusion with Mathematica
The Mathematica system (version 4.0) is employed in the solution of nonlinear difusion and convection-difusion problems, formulated as transient one-dimensional partial diferential equations with potential dependent equation coefficients. The Generalized Integral Transform Technique (GITT) is first implemented for the hybrid numerical-analytical solution of
Journal of the Brazilian Society of Mechanical Sciences. Publicado em: 2001
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18. Estudo numerico da fusão ao redor de um cilindro horizontal incluindo os efeitos convectivos
This work deals with the numerical study of the melting of a phase change material surrounding a horizontal heated cylinder looking at application of this type of process in latent heat thermal energy storage. The influence of the natural convection in the liquid phase has been considered. A two dimensional unsteady mathematical model has been formulated in
Publicado em: 2001
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19. Fusão e solidificação em meio poroso
The objective of this work is to study the phase change in a constituted porous layer of metallic and non-metallic materials, in such a way that the proposed numerical model can be used to satisfy both types of materiaIs. The problem was modeled as one dimensional in plan geometry, where the constant temperature and constant heat flux boundary conditions wer
Publicado em: 2000
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20. Analise de solidificação em geometria cilindrica e a sua aplicação em armazenamento termico
In this work, a phase change thermal storage system of the shell and tube type is modelled. The phase change material is located in the shell and the heat transfer fluid is circulating in the tubes by forced convection. The system is solved using numerical and semi-analytical models. The numerical model consists of solving the momentum and energy equations u
Publicado em: 1999
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21. Modelo para analise de deslocamento miscivel no meio poroso usando a teoria dos canais de fluxo
This work describes a model for the analysis of a two-components, single phase miscible displacement, considering both homogeneous and heterogeneous reservoirs, and constant total mobility (M =1). The streamtubes are computed from the solution of the partial differential equation of the Stream Function. The discretization of such equation results in a pentad
Publicado em: 1998
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22. Resfriamento por convecção natural de placas de circuito impresso formando um canal vertical
Experiments and theoretical modeling were carried out on the cooling by natural convection of an array of vertical parallel printed circuit boards. The thermal analysis of printed circuit boards (PCB) for predicting, as accurately as possible, the temperature of each component is important to obtain an optimal thermal design and to check the performance of a
Publicado em: 1997
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23. Tranferencia de calor no escoamento de gases participantes em alta temperatura atraves de dutos de secção circular revestidos com isolamento não ideal
In this Master degree thesis, the heat transfer in the flow of participating gases through circular cross section ducts is studied, combining the three basic processes: conduction, convection and radiation. It is considered the case in which a high temperature gas tlows through a tube covered by a non-ideal insulation. The gas inlet temperature is uniform an
Publicado em: 1995
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24. Determinação da frente de um banco de fluido não-mewtoniano em um reservatorio com poço parcialmente completado
Water production due to water coning means great losses, inducing reduction in oil production and additional pressure drop in the reservoir, not mentioning the costs for disposal of the produced water - a major pollutant. One method used to decrease water production from coning is the injection of a non-newtonian fluid into the near wellbore region of the re
Publicado em: 1994