Turbulent Flux
Mostrando 13-24 de 33 artigos, teses e dissertações.
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13. Estudo experimental da microfiltração tangencial com membrana cerâmica aplicada na clarificação da vinhaça / Experimental study of cross flow microfiltration with ceramic membrane applied in clarifying the vinasse
This present work studied the process of cross flow microfiltration using tubular ceramic applied in the vinasse clarification from sugar cane, analyzing fluid dynamic features of process and the types of pore blocking applied to math models. In this research was used alfa-alumina (alfa-AL IND.2O IND. 3) ceramic membrane with pore size of 1.2 müm and 0.8 m�
Publicado em: 2010
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14. Estudo do desempenho do processo de microfiltração tangencial com membranas cerâmicas aplicado à retenção de bactérias e redução de sólidos suspensos de uma bebida à base de açaí / Performance study of the crossflow microfiltration process with ceramic membranes applied to the bacteria retention and suspended solids reduction of the beverage based on açai
In this doctoral research, the crossflow microfiltration process utilizing ceramic membranes was investigated aiming at the bacteria retention (Escherichia coli) and reduction of suspended solids of beverage based on açai (Euterpe oleracea Mart.). The selected commercial membranes of alfa-alumina (AL IND.2O IND.3) had nominal pore sizes of 0.8 and 1.2 müm
Publicado em: 2010
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15. Um estudo numérico sobre a transferência de calor na camada limite turbulenta
The present work is a numerical study on the applicaion of analogies between heat and momentum difusion as a methodology to impose heat flux boundary conditions in turbulent boundary layer flows. In order to validate the proposed methodology the following cases were tested: a) a study of turbulent flows over slightly heated flat plates and with unheated star
Publicado em: 2009
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16. UMA SOLUÇÃO PARA A EQUAÇÃO DA ENERGIA CINÉTICA TURBULENTA EMPREGANDO O MÉTODO DAS CARACTERÍSTICAS / A SOLUTION FOR THE TURBULENT KINETIC ENERGY EQUATION EMPLOYING THE METHOD OF CHARACTERISTICS
In this study, using the Method of Characteristics and numeric resources, presents a solution to the equation Spectral Density Evolution of Turbulent Kinetic Energy for a Convective Boundary Layer (CBL) in the morning. It presents three models for the evolution of spectral energy density. The first model, based on the assumption of a system of isotropic turb
Publicado em: 2009
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17. Water and energy fluxes in cowpea and castor beans cultivated in northeast Brazil / Fluxos de Ãgua e de energia em feijÃo macassar e mamona no nordeste do Brasil
The castor beans and cowpea are crops of enormous economic and social importance for the farmers in northeast Brazil, whereas the extracted oil of seeds of castor beans is used for production of biodiesel and the cowpea is the main food for poor population. Independent of crop type, the knowledge of water amount removed from soil by vegetation is of great in
Publicado em: 2009
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18. Theoretical-experimental study on two-dimentional confined jets. / Estudo teórico-experimental de jatos bi-dimensionais confinados.
The main objective of this thesis is to study the mean flow inertial and pressure effects on the mean flow itself in two-dimensional confined jets. The flows considered in the present work are turbulent, isothermal, incompressible and single-fluid. The introduction and the bibliographical review are done by the following presentations: technological and fund
Publicado em: 2009
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19. EMISSÃO DE GASES DE EFEITO ESTUFA EM SISTEMAS DE MANEJO EM SOLO DO PLANALTO MÉDIO DO RIO GRANDE DO SUL / SHORT-TERM GREENHOUSE GASES EMISSIONS IN SOIL MANAGEMENT SYSTEMS IN OXISOL OF SOUTHERN BRAZIL
Agriculture is directly linked to atmospheric concentration of greenhouse gases (GHG) through basic processes that occur in the soil-plant system. Agricultural soils can act as a source or sink of GHG depending on the management practices adopted. The objective of this research was to evaluate the GHG flux in different soil management systems. This project w
Publicado em: 2008
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20. ESTUDO DOS FLUXOS TURBULENTOS DE CALOR SENSÍVEL E LATENTE NO FUNDO DO VALE DO RIO DA PRATA
Three observational campaigns have been conducted in the region of Nova Roma do Sul, southern Brazil. In the last one of them, a micrometeorological tower was deployed above the river surface, at the bottom of the Prata river valley. The purpose was to characterize the exchange between the river surface and the atmosphere. The micrometeorological parameters
Publicado em: 2008
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21. Advanced turbulence modelling for complex aerospace applications.
The objective of the present research work consists in studying complex aerodynamic flows about typical aerospace configuration, in which turbulence effects play a fundamental role. Such study is performed with an available computational tool that is being developed at CTA/IAE. This is a finite-volume code for unstructured 3-D meshes that solves the compress
Publicado em: 2007
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22. AVALIAÇÃO DO MÉTODO DO BALANÇO DA CAMADA LIMITE PARA A ESTIMATIVA DE FLUXOS TURBULENTOS NOTURNOS / EVALUATION OF THE BOUNDARY LAYER BUDGET METHOD FOR NOCTURNAL TURBULENT FLUX ESTIMATES
This work is about to verify the performance of the boundary layer budgeting method as alternative for measuring the surface turbulent fluxes in conditions that allow the validation of the measurements with data taken from a tower equipped with sensors, which were processed through the eddy correlation method. A research is made on the knowledge generated to
Publicado em: 2006
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23. Fluxo de massa na interface ar-água em tanques de grades oscilantes e detalhes de escoamentos turbulentos isotrópicos / Gas transfer near the air-water interface in an oscillating-grid tanks and properties of isotropic turbulent flows
Gas transfer across the air-water interface in turbulent flows is an important process for many environmental systems. To improve the understanding of the basic principles involved in this phenomenon it is necessary to use suitable apparatus and experimental techniques. In this study, experiments and numerical simulation were conducted in a tank with one and
Publicado em: 2006
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24. Processamento e interpretação de dados 2D e 3D de GPR :aplicações no imageamento de feições kársticas e estruturas de dissolução no campo de petróleo de Fazenda Belém-CE
In Fazenda Belém oil field (Potiguar Basin, Ceará State, Brazil) occur frequently sinkholes and sudden terrain collapses associated to an unconsolidated sedimentary cap covering the Jandaíra karst. This research was carried out in order to understand the mechanisms of generation of these collapses. The main tool used was Ground Penetrating Radar (GPR). Th
Publicado em: 2006