Mixing Layer
Mostrando 13-24 de 49 artigos, teses e dissertações.
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13. Numerical investigation of the three-dimensional secondary instabilities in the time-developing compressible mixing layer
Mixing layers are present in very different types of physical situations such as atmospheric flows, aerodynamics and combustion. It is, therefore, a well researched subject, but there are aspects that require further studies. Here the instability of two-and three-dimensional perturbations in the compressible mixing layer was investigated by numerical simulat
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2009-06
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14. Mono and multi-layer electrolytes of ceria and zirconia prepared by tape casting / Eletrólitos mono e multicamadas de céria e zircônia preparados por colagem de fita
In this work it was investigated bi-layer electrolytes prepared by the tape casting technique. These electrolytes were composed of one layer of 10 mol% gadolinia doped ceria (CDG) and another one of 8 mol% yttria-stabilized zirconia (ZEI -8). CDG tapes were prepared with powder from Fuel Cell Materials (FCM) and powder obtained by oxide mixing. ZEI-8 tapes w
Publicado em: 2009
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15. Simulação numérica da evolução linear e não linear em uma camada de mistura compressível tridimensional / Numerical simulation of the linear and non-linear evolution in a three-dimensional compressible mixing layer
As aplicações aeroespaciais estão frequentemente associadas a escoamentos compressíveis com altíssimos números de Reynolds. No entanto, existem no contexto aeroespacial importantes aplicações que envolvem escoamentos compressíveis a Reynolds relativamente baixos. Entre eles se destacam o escoamento em pás de turbina a gás e ao redor de dispositivo
Publicado em: 2009
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16. Aeroacústica e instabilidades de uma camada de mistura compressível / Flow instability and aeroacoustics of a compressible mixing layer
Tanto os motores turbo-jato quanto os turbo-fan, são os maiores responsáveis pela geração de ruído durante a decolagem, segmento de subida e de aceleração de uma aeronave. Devido a isto, o problema de ruído em jatos vem sendo intensamente investigado ao longo dos últimos anos. Já na fase do pouso, o slat é uma das fontes de ruído mais importantes
Publicado em: 2009
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17. Mistura de cores: uma nova abordagem para processamento de cores e sua aplicação na segmentação de imagens / Colors mixture: a new approach for color processing and its application in image segmentation
Inspired on the techniques used by painters to overlap layers of various hues of paint to create oil paintings, and also on observations of the distribution of cones in human retina for the interpretation of these colors, this thesis proposes an image processing technique based on color mixing. This is a static color quantization method that expresses the mi
Publicado em: 2009
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18. Prediciton of high-pressure vapor liquid equilibrium of six binary systems, carbon dioxide with six esters, using an artificial neural network model
Artificial neural networks are applied to high-pressure vapor liquid equilibrium (VLE) related literature data to develop and validate a model capable of predicting VLE of six CO2-ester binaries (CO2-ethyl caprate, CO2-ethyl caproate, CO2-ethyl caprylate, CO2-diethyl carbonate, CO2-ethyl butyrate and CO2-isopropyl acetate). A feed forward, back propagation n
Brazilian Journal of Chemical Engineering. Publicado em: 2008-03
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19. Resposta da Plataforma Continental Sudeste a ventos sazonais e sinóticos de verão: estudos numéricos / Response of the South Brazil bight to summer seasonal and synoptic winds: numerical studie
In order to study the pertubations caused on the South Brazil Bigth (SBB) caused by the passage of a cold front during Summer, a mean basic state for currents was obtained using the POM (Princeton Ocean Model) through diagnostic simulation, followed by a short round prognostic. The mean currents modeled are in certain instancies similar to the currents measu
Publicado em: 2008
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20. INVESTIGAÇÃO NUMÉRICA DO ESCOAMENTO DENTRO E ACIMA DO DOSSEL DE FLORESTAS / NUMERICAL INVESTIGATION OF FLOW WITHIN AND ABOVE FOREST CANOPY
This work investigates different procedures in order to study the turbulent flow over the scale model of a forest region. Initially, the canopy flow was modeled by using source terms in the momentum, turbulent kinetic energy and its dissipation rate equations. After that, the forest canopy was considered a homogeneous porous medium. In the last step, the can
Publicado em: 2007
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21. Systemic analysis of noise penalties all-optical network / AnÃlise sistÃmica das penalidades de ruÃdo nas redes Ãpticas transparentes
In this thesis, the routing and wavelength assignment processes are addressed. Besides of considering the network layer resources (number of available wavelengths in a link), the impact of physical layer effects in the transmitted optical signals is analyzed for both processes. The optimization of the wavelength assignment process is obtained by minimizing t
Publicado em: 2007
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22. Propriedades físicas de bicamadas magnéticas
The magnetic order of bylayers composed by a ferromagnetic film (F) coupled with an antiferromagnetic film (AF) is studied. Piles of coupled monolayers describe the films and the interfilm coupling is described by an exchange interaction between the magnetic moments at the interface. The F has a cubic anisotropy while the AF has a uniaxial anisotropy. We ana
Publicado em: 2007
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23. Análise de estabilidade linear de camada de mistura compressível binária / Linear stability analysis of a compressible binary mixing layer
Os sistemas aeroespaciais em sua maioria, se utilizam da liberação de energia química para funcionar. Dentre as aplicações mais comuns estão os motores de aeronaves (i.e. turbinas a gás) e motores foguete. Ambos precisam que o combustível seja misturado com um oxidante em uma camara de combustão para que reajam e formem gases, que serão expandidos
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 12/12/2006
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24. The influence of stable stratification on the transition to turbulence in a temporal mixing layer
The transition to turbulence in a stably stratified flow is a problem of considerable interest in fluid dynamics with applications in both geophysical sciences and engineering. This transition is controlled by competition between the vertical shear of the base flow and the buoyancy forces due to the density stratification. The present work investigates numer
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2006-06