Heat Reservoir
Mostrando 13-24 de 42 artigos, teses e dissertações.
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13. Estudo da recuperação de óleo por drenagem gravitacional assistida por injeção de vapor
Steam assisted gravity drainage process (SAGD) involves two parallel horizontal wells located in a same vertical plane, where the top well is used as steam injector and the bottom well as producer. The dominant force in this process is gravitational. This improved oil recovery method has been demonstrated to be economically viable in commercial projects of o
Publicado em: 2008
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14. ANÁLISE DO DESEMPENHO DE UM SISTEMA DE COGERAÇÃO COM UMA MICROTURBINA A GÁS NATURAL / PERFORMANCE ANALYSIS OF A GAS FIRED MICROTURBINE BASED COGENERATION SYSTEM
In this dissertation the performance of a cogeneration system was simulated using data obtained in tests of a natural gas fired 30 kW microturbine, operated during peak hours, and coupled to a heat recovery unit to generate hot water to be consumed in the showers of the PUC-Rio Gymnasium, together with a thermal reservoir to match the demand. Initially, the
Publicado em: 2007
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15. Foraminíferos planctônicos em resposta às mudanças oceanográficas no Atlântico Tropical oeste durante os últimos 30.000 anos / Planktonic foraminifera response to oceanographic changes in the western tropical Atlantic during the last 30,000 years
The planktonic foraminiferal assemblages of two piston cores from western tropical Atlantic covering the last 30,000 years have been analysed together with paleoceanographic ANN sea surface temperature reconstruction and ?18O and ?13C of the shallow dwelling planntonic foraminifera Globigerinoides ruber white. These proxies reveal that during the Last Glacia
Publicado em: 2007
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16. Contributions to South Atlantic paleoceanography in the last 25,000 years: evidence from calcareous nannofossils from northeastern brazilian slope / Nanofósseis calcários da margem continental nordeste do Brasil: uma contribuição à paleoceanografia do Atlântico Sul nos últimos 25.000 anos
This study focuses on changes in calcareous nannofossil assemblages as an evidence of paleoceanographic variability during the last 25,000 years in two deep sea piston cores from the northeastern Brazilian continental margin. To support reconstructing ancient marine environment others proxies have been applied along with the calcareous nannofossil analysis:
Publicado em: 2007
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17. Wave sequences for solid fuel adiabatic in-situ combustion in porous media
We study the Riemann problem with forward combustion due to injection of air into a porous medium containing solid fuel. We neglect air compressibility and heat loss to the rock formation. Given initial reservoir and injection conditions, we prove that there is a unique time asymptotic wave sequence for combustion with complete oxygen consumption. The sequen
Computational & Applied Mathematics. Publicado em: 2006
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18. Estudo do acoplamento efetivo entre duas particulas brownianas quanticas / Study of effective coupling between two quantum Brownian particles
We use the system-plus-reservoir model to study the dynamics of a system of two particles that interact with a heat bath in thermal equilibrium, but do not interact with each other. We present an extension of the bath of oscillators capable of inducing an effective coupling between the brownian particles depending on the choice made to the spectral function
Publicado em: 2006
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19. Influence of the recast and different marginal configurations in the cervical and interior adaptation of Ni-Cr alloy total metallic crowns / Influencia da refusão de uma liga de niquel-cromo na adaptação cervical e interna de coroas totais com diferentes configurações marginais
The aim of the present study was to verify the influence of the heat source on the castability and hardness of a Ni-Cr-based commercial alloy ? VERA BONO II - in three different conditions: new (first use), recast, and new mixed with scraps. In order to evaluate castability, 10 specimens were made for each alloy condition, using a polyester sieve with 11x11
Publicado em: 2005
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20. Steam injection into water-saturated porous rock
We formulate conservation laws governing steam injection in a linear porous medium containing water. Heat losses to the outside are neglected. We find a complete and systematic description of all solutions of the Riemann problem for the injection of a mixture of steam and water into a water-saturated porous medium. For ambient pressure, there are three kinds
Computational & Applied Mathematics. Publicado em: 2003
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21. Contribuição da velocimetria doppler laser para a otimização de componentes descartaveis utilizados em circulação extracorporea
t: Introduction: Cardiopulmonary bypass ( CBP ) associates techniques that allow a temporary cardiopulmonary isolation through utilization of a set of machines, devices and circuits. Sophisticated techniques must be applied in order to study blood behavior inside cardiopulmonary bypass system without interference. The Laser Doppler Velocimetry (LDV) uses lig
Publicado em: 2002
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22. Competing spin dynamics in ising systems
We study ferromagnetic and antiferromagnetic Ising models in contact with a heat reservoir, and subject to an external source of energy. The contact with the heat bath is simulated by a single-spin flip Glauber dynamics, while the flux of energy is simulated by the two-spin exchange Kawasaki process. Pair approximation and Monte Carlo calculations are employ
Brazilian Journal of Physics. Publicado em: 2000-03
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23. Comportamento da temperatura do fluido infetado no reservatorio em operações de aciclificação de matriz
Matrix Acidization is frequently used to remove formation damage from pore plugging caused by deposition of small mineral particles. The kinetics of the chemical reactions between acid and minerais is very sensitive to fluid temperature. The temperature of the acid at the injection zone depth depends on the heat transfer that occurs as the acid travels throu
Publicado em: 1996
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24. STUDY OF HEAT LOSSES IN PETROLEUM RESERVOIRS / ESTUDO DE PERDAS DE CALOR EM RESERVATÓRIOS DE PETRÓLEO
Neste trabalho analisam-se perdas de calor para as formações adjacentes a reservatórios de petróleo submetidos a métodos térmicos de recuperação, em especial para os métodos de injeção de vapor e combustão in-situ. O cálculo desta perda usualmente utiliza um modelo unidimensional vertical de condução de calor nos estratos adjacentes, desprezan
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/12/1988