Unsaturated Porous Media
Mostrando 1-12 de 13 artigos, teses e dissertações.
-
1. Capillary pressure driven water movement in wet unsaturated porous media: effect of particle electric charge
Experimentos do fluxo da água usando um meio poroso não saturado compoto por diferentes sistemas de α- alumina molhada não-saturada indicam que a carga superficial da partícula diminuiu com o aumento da água movimentada. O movimento máximo de água ocorreu quando a carga superficial era zero. O movimento da água foi afetado pela espessura da dupla ca
Journal of the Brazilian Chemical Society. Publicado em: 2010
-
2. NUMERICAL MODELLING OF INFILTRATION OF HYDROCARBONS IN UNSATURATED SOILS USING THE FINITE VOLUME METHOD / MODELAGEM NUMÉRICA DA INFILTRAÇÃO DE HIDROCARBONETOS EM SOLOS NÃO SATURADOS UTILIZANDO O MÉTODO DE VOLUMES FINITOS
A large proportion of the population depends on groundwater for consumption. Thus, leakage of gasoline tanks represents a significant risk to public health besides the risk of fire and explosion in the sewer lines, due to the flammable gases. These tanks are generally located in the unsaturad soil above the groundwater level. It is therefore important to eva
Publicado em: 2009
-
3. Boundary element method formulation for reinforced porous material / Formulação do método dos elementos de contorno para materiais porosos reforçados
In this work a nonlinear formulation of the boundary element method (BEM) is proposed to deal with saturated and unsaturated poro-elasto-plastic 2D reinforced domains. To model reinforced porous domains a BEM/FEM (Finite Element Method) modified coupling technique is employed. The coupling is made by using the least square method to regularize the displaceme
Publicado em: 2008
-
4. NUMERICAL MODELING OF VIRUS TRANSPORT IN FRACTURED-POROUS MEDIA / MODELAGEM NUMÉRICA DO TRANSPORTE DE VÍRUS EM AQÜÍFEROS FRATURADOS - POROSOS
Setback distances of wellhead and catchments from septic tanks are establised by three aproaches: methods based on fixed setback distances or fixed travel times; methods based on vulnerability analysis and methods based on infection risk. In Costa Rica, the determination of setback distances is based on fixed travel times. This approach considers that during
Publicado em: 2008
-
5. FLUX AND TRANSPORT STUDY OF PURE GASOLINE AND GASOLINE BLENDED ETHANOL IN UNSATURATED POROUS MEDIA / ESTUDO DO FLUXO E TRANSPORTE DE GASOLINA PURA E MISTURADA COM ETANOL EM MEIOS POROSOS NÃO SATURADOS
The subsurface release of water immiscible pollutants (NAPLs) due to leaks in storage tanks or pipelines and spilling transportation accidents is of great concern, since the NAPL or its constituents may migrate through the vadose zone until reaching the water table and eventually contaminate clean water sources. In Brazil, most of the gas stations store etha
Publicado em: 2007
-
6. DEVELOPMENT OF AN INTEGRATED SYSTEM FOR THE MODELLING OF FLOW AND TRANSPORT IN POROUS AND FRACTURED MEDIA / DESENVOLVIMENTO DE UM SISTEMA INTEGRADO PARA MODELAGEM DE FLUXO E TRANSPORTE EM MEIOS POROSOS E FRATURADOS
Este trabalho apresenta o desenvolvimento de um sistema integrado de modelagem, tridimensional, de fluxo e transporte em meios porosos e fraturados. O sistema é composto de seis programas computacionais, que são responsáveis pela geração de superfícies geológicas (Gocad), geração de sistemas de fraturas (FracGen3D), modelagem geométrica (MG), anál
Publicado em: 2006
-
7. A COUPLED MODEL FOR TWO-PHASE FLOW THROUGH ELASTOPLASTIC POROUS MEDIA / UM MODELO ACOPLADO PARA FLUXO BIFÁSICO EM MEIOS POROSOS ELASTOPLÁSTICOS
This dissertation studies a coupled flow and deformation model for saturated and non-saturated soils, based on Biot`s theory but taking into account the nonlinear material behavior of soil. In the non-saturated condition the fluid flow can be considered either as a two-phase or an one-phase problem. In the two-phase case, the model calculates the pressure of
Publicado em: 2005
-
8. 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
-
9. MODELLING AND NUMERICAL SIMULATION OF THE TWO PHASES FLUX AND TRANSPORT MULTICOMPONENT IN THE POROUS MEDIUM WITH NO ISOTERMIC-CHEMICAL INTERACTION / MODELAGEM E SIMULAÇÃO NUMÉRICA DO FLUXO BIFÁSICO E DO TRANSPORTE MULTICOMPONENTE EM MEIOS POROSOS COM INTERAÇÃO TERMO-QUÍMICA
Este trabalho apresenta o estágio atual do desenvolvimento de uma ferramenta numérica para simulação e análise do fluxo bifásico e do transporte multicomponente e de calor em meios porosos com interação química em duas dimensões. O programa desenvolvido foi baseado no UNSATCHEM_2D escrito em linguagem Fortran. A discretização das equações difer
Publicado em: 2004
-
10. Influence of the Gas-Water Interface on Transport of Microorganisms through Unsaturated Porous Media
In this article, a new mechanism influencing the transport of microorganisms through unsaturated porous media is examined, and a new method for directly visualizing bacterial behavior within a porous medium under controlled chemical and flow conditions is introduced. Resting cells of hydrophilic and relatively hydrophobic bacterial strains isolated from grou
-
11. Noninvasive Quantitative Measurement of Bacterial Growth in Porous Media under Unsaturated-Flow Conditions†
Glucose-dependent growth of the luxCDABE reporter bacterium Pseudomonas fluorescens HK44 was monitored noninvasively in quartz sand under unsaturated-flow conditions within a 45- by 56- by 1-cm two-dimensional light transmission chamber. The spatial and temporal development of growth were mapped daily over 7 days by quantifying salicylate-induced bioluminesc
American Society for Microbiology.
-
12. VIRTUS, a model of virus transport in unsaturated soils.
As a result of the recently proposed mandatory groundwater disinfection requirements to inactivate viruses in potable water supplies, there has been increasing interest in virus fate and transport in the subsurface. Several models have been developed to predict the fate of viruses in groundwater, but few include transport in the unsaturated zone and all requ