Stable Boundary Layer
Mostrando 1-12 de 12 artigos, teses e dissertações.
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1. Simulación matemática para la optimización del patrón de flujo entregado por una buza para el molde de colada continua de planchón delgado
ABSTRACT Understanding the behavior of the oscillations of the jets into the mold of thin slab funnel is essential to ensure a constant supply of liquid steel, improve control of the flow patterns and consequently increase plant productivity and the final product quality. To achieve this, we conducted a study of the effect of the internal design of the nozzl
Matéria (Rio J.). Publicado em: 19/07/2018
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2. LIMITES OPERACIONAIS DO PROCESSO DE REVESTIMENTO POR CORTINA / OPERABILITY LIMITS OF THE CURTAIN COATING PROCESS
Curtain coating is one the preferred methods for precision multi-layer coatings at high speeds. Curtain coating belongs to the class of premetered coating methods. Liquid falls as a sheet, or curtain, freely over a considerable height and under the action of gravity before it impinges onto the substrate being coated. Edge guide are needed to maintain at spec
Publicado em: 2009
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3. ESPECTROS DE TURBULÊNCIA EM TERRENO COMPLEXO
Throughout this paper a spectral analysis is conducted on the superficial limit layer in complex terrains. The data used were collected in the central part of the state of Rio Grande do Sul, in the Valley of Jacuí River. A 15-meter tower, with fast-response sensors and slowresponse ones, collected data at frequencies of 10 Hz and 1 Hz, in July and August 20
Publicado em: 2008
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4. Modelagem numérica da camada limite atmosférica com validação experimental
This work presents the modeling of the atmospheric boundary layer to get the wind speed and wind direction profile over a complex terrain. The study of the atmospheric boundary layer is very important for the power lines project, determination of power cables insulating chain oscillation, power line limit load project and study of atmosphere pollutant disper
Publicado em: 2007
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5. STUDY OF TURBULENT DIFUSION EMPLOYING LAGRANGIAN STOCHASTIC MODELS / ESTUDO DA DIFUSÃO TURBULENTA EMPREGANDO MODELOS ESTOCÁSTICOS LAGRANGEANOS
In this work, the Lagrangian stochastic particle model LAMBDA is utilized to simulate the dispersion and the transport of contaminants under different atmospheric conditions. The analysis employs three different field experiments of atmospheric diffusion: the Copenhagen experiment, which was accomplished in unstable conditions, the Prairie Grass experiment i
Publicado em: 2007
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6. 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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7. Experimental investigation of turbulent boundary layers over steep two-dimensional elevations
This work presents a laboratory study on the behavior of turbulent boundary layers over steep topographic elevations. Two main topics of interest are addressed here: (i) to investigate and characterize the separated flow region that is formed on the leeside of a steep elevation, and (ii) to evaluate the effects of flow stability conditions on the properties
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2005-12
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8. A comparison of two turbulent dispersion parameterisations in the stable boundary layer using Lagrangian and Eulerian models
Um modelo Euleriano e um de partículas Lagrangeano são usados para estudar a dispersão de um contaminante liberado por uma fonte de altura baixa na Camada Limite Estável. O modelo Euleriano é baseado na solução da equação de difusão-advecção, utilizando-se a técnica da transformada de Laplace. O modelo Lagrangeano é baseado na forma generalizad
Revista Brasileira de Geofísica. Publicado em: 2002-08
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9. Layer-induced elastic anisotropy Part 2: inversion of compound parameters to constituent parameters
In Part 1 of this paper (Helbig, 1998 - Rev. Bras. Geof. 16 (2-3):103-114) it was shown that a medium consisting of a periodic sequence of layers is, in the long-wavelength approximation, equivalent to a homogeneous compound medium with elastic parameters that are generalized averages of the constituents' sti
Revista Brasileira de Geofísica. Publicado em: 2000-08
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10. Colorless Sulfur Bacteria, Beggiatoa spp. and Thiovulum spp., in O2 and H2S Microgradients
The interactions between colorless sulfur bacteria and the chemical microgradients at the oxygen-sulfide interface were studied in Beggiatoa mats from marine sediments and in Thiovulum veils developing above the sediments. The gradients of O2, H2S, and pH were measured by microelectrodes at depth increments of 50 μm. An unstirred boundary layer in the water
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11. Oxygen Responses and Mat Formation by Beggiatoa spp
The behavioral response of single Beggiatoa sp. filaments moving on a gas-permeable membrane was studied by the combined use of microscopy and oxygen microelectrodes during controlled oscillations of oxygen tension. The bacteria reacted to increasing oxygen by reversing the direction of movement. The same step-up phobic response to oxygen was observed when a
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12. A k-space method for acoustic propagation using coupled first-order equations in three dimensions
A previously described two-dimensional k-space method for large-scale calculation of acoustic wave propagation in tissues is extended to three dimensions. The three-dimensional method contains all of the two-dimensional method features that allow accurate and stable calculation of propagation. These features are spectral calculation of spatial derivatives, t
Acoustical Society of America.