Drag Reduction
Mostrando 1-12 de 28 artigos, teses e dissertações.
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1. Aerodynamic Evaluation of Different Car Carrier Devices for Drag Reduction Using CFD
ABSTRACT: Aerodynamic of commercial trucks has been extensively studied due to their impact on fuel efficiency; reducing consumption is one of the most important and challenging issues for the trucking industry. In this paper, several Computational Fluid Dynamic (CFD) simulations are performed to evaluate the drag of a standard car carrier and its different
J. Aerosp. Technol. Manag.. Publicado em: 21/09/2018
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2. Carbothermic reduction of Electric Arc Furnace Dust via thermogravimetry
Abstract Electric Arc Furnace Dust (EAFD) is a solid waste originated from electric steelmaking furnaces. Currently, according to some authors, there is an estimated generation of 15 to 25 kg of dust per ton of steel produced. The formation of the dust is related to the following steps of the process: furnace charge, metal volatilization, iron vaporization u
REM, Int. Eng. J.. Publicado em: 2018-07
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3. High-velocity Penetration of Concrete Targets with Three Types of Projectiles: Experiments and Analysis
Abstract This study conducted high-velocity penetration experiments using conventional ogive-nose, double-ogive-nose, and grooved-tapered projectiles of approximately 2.5 kg and initial velocities between 1000 and 1360 m/s to penetrate or perforate concrete targets with unconfined compressive strengths of nominally 40MPa. The penetration performance data of
Lat. Am. j. solids struct.. Publicado em: 2017-09
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4. EXPERIMENTAL STUDY ON THE COLLABORATIVE DRAG REDUCTION PERFORMANCE OF A SURFACTANT SOLUTION IN GROOVED CHANNELS
Abstract Turbulence with a relatively larger vortex is obtained in drag-reducing surfactant solution, which provides an excellent condition for the application of small scale grooves. In this work, the coupling drag reduction performance of surfactant solution and grooves was experimentally investigated to explore the complementary possibility between their
Braz. J. Chem. Eng.. Publicado em: 2017-01
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5. THE EFFECT OF SURFACTANT AND HIGH MOLECULAR WEIGHT POLYMER ADDITION ON PRESSURE DROP REDUCTION IN PIPE FLOW
Abstract The main aim of this paper is to present a possibility to enhance the drag reduction effect in straight pipe flow by the simultaneous addition to the transported liquid of a small amount of high molecular weight polymers and surfactants. Qualitative analysis of the polymer-micellar additive influence on the shape and character of flow resistance cur
Braz. J. Chem. Eng.. Publicado em: 2016-12
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6. Calculation of The Vehicle Drag and Heating Reduction at Hypervelocities with Laser-Induced Air Spike
ABSTRACT: Scientists at the laboratory of Força Aérea Brasileira (FAB) have demonstrated experimentally that laser-induced "air spikes" (DEAS) may reduce effectively both total vehicle drag and heating at hypervelocities. Now, we apply the Rayleigh flow to directly determine the degree of reduction in vehicle drag and convective heat flux into the airframe
J. Aerosp. Technol. Manag.. Publicado em: 2013-03
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7. Métodos de redução do arrasto e seus impactos sobre a estabilidade veicular / Methods of drag reduction and the impacts on the vehicle aerodynamics stability
The growing environmental concern and the necessity to create more efficient products have motivated researchers to conduct studies about the aerodynamic vehicle. These two aspects are the main reasons which are promoting a great demand for knowledge in this theme. This science may be considered relatively new and still lacks more databases. Understand how a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 02/06/2011
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8. Redução de atrito no escoamento de óleo diesel / Drag reduction during flow in diesel oil
A redução de atrito hidrodinâmico tem importantes aplicações em engenharia de petróleo, propiciando a produção e o transporte de petróleo ou seus derivados a vazões mais altas. As dimensões continentais do território brasileiro implicam na necessidade de uma eficiente rede de distribuição de derivados de petróleo, como por exemplo, o óleo die
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 25/02/2011
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9. Drag reduction by polyethylene glycol in the tail arterial bed of normotensive and hypertensive rats
This study was designed to evaluate the effect of drag reducer polymers (DRP) on arteries from normotensive (Wistar) and spontaneously hypertensive rats (SHR). Polyethylene glycol (PEG 4000 at 5000 ppm) was perfused in the tail arterial bed with (E+) and without endothelium (E-) from male, adult Wistar (N = 14) and SHR (N = 13) animals under basal conditions
Brazilian Journal of Medical and Biological Research. Publicado em: 2011-08
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10. Investigation of the adjoint method in aerodynamic optimization using various shape parameterization techniques
This paper studies the effect of design variables vector on automatic aerodynamic shape optimization in the adjoint method. Three shape techniques are studied: surface points, relations of the NACA 4-digit airfoil series and Hicks-Henne "Bump" Functions. First, this paper presents the complete formulation of the optimal design problem for the Euler equations
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-06
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11. Estudo do fenômeno de redução de atrito em escoamento disperso óleo - água em tubulação horizontal / Investigation on drag reduction phenomenon in horizontal oil - water dispersed pipe flow
O interesse em escoamento bifásico líquido-líquido aumentou recentemente, em especial devido às grandes perdas de energia envolvidas no transporte de petróleo, onde comumente uma mistura bifásica óleo-água é deslocada ao longo de grandes distancias. Embora este tipo de escoamento seja comum na indústria, não existem tantos trabalhos na literatura
Publicado em: 2009
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12. REDUÇÃO DE ATRITO EM ESCOAMENTO LAMINAR POR LUBRIFICAÇÃO DE PAREDE COM RANHURAS / DRAG REDUCTION IN LAMINAR FLOW BY LUBRICATION OF GROOVED WALLS
Objetivo: Uma parte significativa das reservas mundiais de petróleo é encontrada na forma de óleos pesados. Estes óleos pesados possuem alta viscosidade de 100 - 10000 cP, que torna seu transporte altamente complexo e custoso. Vários métodos foram desenvolvidos para reduzir a perda de carga de escoamentos laminares de óleos de alta viscosidade. Entre
Publicado em: 2009