Turbulent Kinetic Energy
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Steel desulfurization on RH degasser: physical and mathematical modeling
Abstract Due to the high-quality steel demand, especially for ultra-low Sulfur steel, RH desulfurization has been practiced. Based on this, mathematical and physical modeling have been applied to study steel desulfurization by reagent addition in the RH degasser vacuum chamber. The main result of cold modeling, using water and oil emulating steel and slag, r
REM - International Engineering Journal. Publicado em: 2022
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2. A Statistical Dynamic Model for the Turbulent Transport of Kinetic Energy in Shear Layers
ABSTRACT: Dynamic statistical equations for the turbulent fluxes of scalars and momentum in incompressible flows are derived after time wise integration of the equation for the oscillating transported property, decomposing the turbulent fluxes in terms representing distinct features of the main and fluctuating flow that influence the respective turbulent tra
J. Aerosp. Technol. Manag.. Publicado em: 07/06/2018
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3. Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion
ABSTRACT The present work analyzes the effectiveness of windbreaks against wind erosion through the study of streamline patterns and turbulent flow by means of sonic anemometry and sediment traps. To this end, windbreaks composed of plastic meshes (7.5 m long and 0.7 m tall) were used. Windbreaks are a good means to reduce wind erosion, as they produce a pos
Sci. agric. (Piracicaba, Braz.). Publicado em: 2017-12
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4. Numerical Study of Wake Characteristics in a Horizontal-Axis Hydrokinetic Turbine
ABSTRACT Over the years most studies on wake characteristics have been devoted to wind turbines, while few works are related to hydrokinetic turbines. Among studies applied to rivers, depth and width are important parameters for a suitable design. In this work, a numerical study of the wake in a horizontal-axis hydrokinetic turbine is performed, where the ma
An. Acad. Bras. Ciênc.. Publicado em: 01/12/2016
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5. NUMERICAL PREDICTION OF BUBBLE SIZE AND INTERFACIAL AREA CONCENTRATION IN THE LIQUID BATH OF AN ENTRAINED-FLOW COAL GASIFIER
Abstract A CFD-ABND coupling model was used to study the flow characteristic of gas-liquid two-phase flow in the process of gas passing through the liquid bath of a water-coal-slurry entrained-flow gasifier. In this model, an average bubble number density (ABND) approach was employed and merged with the two-fluid model. A two-phase version of the RNG k-ε tu
Braz. J. Chem. Eng.. Publicado em: 2016-03
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6. INFLUENCE OF INTERFACIAL FORCES ON THE MIXTURE PREDICTION OF AN ANAEROBIC SEQUENCING BATCH REACTOR (ASBR)
AbstractIn the operation of bioreactors, the fluid movement promotes mixing between sludge and substrate. The dynamics of this system are complex, and the interaction between the phases is difficult to evaluate accurately. In this work, Computational Fluid Dynamics is applied to simulate a pilot-scale anaerobic sequencing batch reactor, using a three-dimensi
Braz. J. Chem. Eng.. Publicado em: 2015-06
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7. Effect of internal recirculation velocity in an anaerobic sequencing batch reactor (ASBR)
This paper discusses the effect of different internal recirculation velocities on the mixture and shear stress on the flocs in an anaerobic sequencing batch reactor (ASBR). Thus, simulations are performed using a computational fluid dynamics (CFD) tool to evaluate this dependency. The analysis of velocities and turbulent kinetic energy indicates that the hig
Braz. J. Chem. Eng.. Publicado em: 2014-12
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8. Observational Study of the Surface Layer at an Ocean-Land Transition Region
ABSTRACT: High-frequency measurements of wind, and temperature were made during the dry season of 2008 to study the development of an internal boundary layer at the main Brazilian space launching centre, Centro de Lançamento de Alcântara at Alcântara, Maranhão, Brazil. Turbulence measurements taken at the coast, in two different points 227 m apart show d
J. Aerosp. Technol. Manag.. Publicado em: 2013-12
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9. Experimentação física do escoamento gás-líquido em uma coluna de bolhas retangular utilizando a técnica PIV e a técnica de sombras SHADOW / Gas- liquid experimentation in a rectangular bubble column using PIV and Shadow techniques
Bubble columns are multiphase contact devices for mass and heat transfer, wich are intensively used in different industrial areas. Flow and turbulence in these equipments are induced by the bubble rise motion. The hydrodynamics and bubble behavior in a homogeneous bubbly flow regime was analyzed in a rectangular laboratory-scale bubble column (50 x 20 x 220
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/07/2012
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10. Simulação tridimensional de uma coluna de bolhas cilíndrica : análise em sistema bifásico por técnica de velocimetria por imagem de partícula (PIV), shadow imaging e simulação / Three-dimensional simulation of a cylindrical bubble column : analysis in biphase system by technique of particle image velocimetry (PIV), shadow imaging and simulation
This research aims to evaluate the numerical results from Computational Fluid Dynamics (CFD) simulations and experimental results obtained using Particle Image Velocimetry (PIV) and Shadow Imaging in a bubble column of 1m height, diameter of 14,5cm with a gas distributor with 5 holes of 1 mm diameter each one. The system studied was water-air. The study was
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/07/2012
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11. On the evaluation of linear and non-linear models using DNS data of turbulent channel flows
In this paper, a priori and a posteriori analyses of algebraic linear and non-linear models are carried out in order to compare their ability to predict near wall turbulent flows. Tests were done using data from a direct numerical simulation (DNS) of a plane channel flow for three Reynolds numbers, based on the friction velocity, Reτ = 180, Reτ = 395 and R
J. Braz. Soc. Mech. Sci. & Eng.. Publicado em: 2012-12
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12. PARAMETRIZAÇÃO DO TRANSPORTE DE ENERGIA CINÉTICA TURBULENTA NA CAMADA LIMITE CONVECTIVA / PARAMETERIZATION FOR THE TURBULENT KINETIC ENERGY TRANSPORT IN THE CONVECTIVE BOUNDARY LAYER
Neste trabalho, uma parametrização para os termos de transporte da equação de balanço de energia cinética turbulenta (ECT), válida para uma camada limite convectiva (CLC), é apresentada. Esta é uma tarefa complicada de ser realizada a partir de dados experimentais, especialmente devido a dificuldade associada às medidas das flutuações de pressão
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 15/12/2011