The Experts below are selected from a list of 672 Experts worldwide ranked by ideXlab platform
Allan Paull - One of the best experts on this subject based on the ideXlab platform.
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Shock-tunnel skin-friction measurement in a supersonic combustor
Journal of Propulsion and Power, 1999Co-Authors: Christopher P. Goyne, Raymond J. Stalker, Allan PaullAbstract:Shock-tunnel measurements are reported of skin friction with supersonic hydrogen-air combustion in a constant area duct. A floating-element skin-friction gauge was used, in which the shear force was applied directly to a piezoceramic measuring element. The experiments were conducted at stagnation enthalpies of 5.7 and 6.8 MJ kg(-1), a Precombustion Mach number of similar to 4.5, and with a maximum duct Reynolds number of 1.3 x 10(7). The measurements showed that, although supersonic combustion caused the skin friction to fluctuate with time, it did not affect the mean value of the skin friction coefficient, and this mean value could be predicted using existing turbulent: boundary-layer theory. Measurements of heat transfer also established that Reynolds analogy could be used in both the fuel-off and fuel-on flows.
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Shock tunnel skin friction measurement in a supersonic combustor
36th AIAA Aerospace Sciences Meeting and Exhibit, 1998Co-Authors: Christopher P. Goyne, Raymond J. Stalker, Allan PaullAbstract:Shock tunnel measurements are reported of skin friction with supersonic hydrogen-air combustion in a constant area duct. A floating element skin friction gauge was used, in which the shear force was applied directly to a piezoceramic measuring element. The experiments were conducted at stagnation enthalpies of 5.7 and 6.8 MJ kg, a Precombustion Mach number of approximately 4.5, and with a maximum duct Reynolds number of 1.3x10. The measurements showed that the skin friction coefficient was unaffected by supersonic combustion, and could be predicted by the correlation of Spalding and Chi. Measurements of heat transfer also established that Reynolds analogy could be used in both the fuel-off and fuel-on flows.
Thijs J. H. Vlugt - One of the best experts on this subject based on the ideXlab platform.
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Solubility of the Precombustion gases CO2, CH4, CO, H2, N2, and H2S in the ionic liquid [bmim][Tf2N] from Monte Carlo simulations
Journal of Physical Chemistry C, 2014Co-Authors: Mahinder Ramdin, Sayee Prasaad Balaji, Juan José Gutiérrez-sevillano, J. M. Vicent-luna, Theo W. De Loos, Sofia Calero, Thijs J. H. VlugtAbstract:Monte Carlo simulations were used to compute the solubility of the pure gases CO2, CH4, CO, H2, N2, and H2S in the ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [bmim][Tf2N]. Simulations in the osmotic ensemble were performed to compute absorption isotherms at a temperature of 333.15 K using the versatile continuous fractional component Monte Carlo (CFCMC) method. The predicted gas solubilities and Henry constants are in good agreement with the experimental data. The Monte Carlo simulations correctly predict the observed solubility trend, which obeys the following order: H2S > CO2 > CH4 > CO > N2 > H2. Relevant separation selectivities for the Precombustion process are calculated from the pure gas Henry constants and a comparison with experimental data is provided.
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Solubility of the Precombustion Gases CO2, CH4, CO, H2, N2, and H2S in the Ionic Liquid [bmim][Tf2N] from Monte Carlo Simulations
2014Co-Authors: Mahinder Ramdin, J. M. Vicent-luna, Theo W. De Loos, Sayee Prasaad Balaji, Juan José Gutiérrez-sevillano, Sofía Calero, Thijs J. H. VlugtAbstract:Monte Carlo simulations were used to compute the solubility of the pure gases CO2, CH4, CO, H2, N2, and H2S in the ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [bmim][Tf2N]. Simulations in the osmotic ensemble were performed to compute absorption isotherms at a temperature of 333.15 K using the versatile continuous fractional component Monte Carlo (CFCMC) method. The predicted gas solubilities and Henry constants are in good agreement with the experimental data. The Monte Carlo simulations correctly predict the observed solubility trend, which obeys the following order: H2S > CO2 > CH4 > CO > N2 > H2. Relevant separation selectivities for the Precombustion process are calculated from the pure gas Henry constants and a comparison with experimental data is provided
C Pevida - One of the best experts on this subject based on the ideXlab platform.
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predicting mixed gas adsorption equilibria on activated carbon for Precombustion co2 capture
Langmuir, 2013Co-Authors: Susana Garcia, J J Pis, F Rubiera, C PevidaAbstract:We present experimentally measured adsorption isotherms of CO2, H2, and N2 on a phenol–formaldehyde resin-based activated carbon, which had been previously synthesized for the separation of CO2 in a Precombustion capture process. The single component adsorption isotherms were measured in a magnetic suspension balance at three different temperatures (298, 318, and 338 K) and over a large range of pressures (from 0 to 3000–4000 kPa). These values cover the temperature and pressure conditions likely to be found in a Precombustion capture scenario, where CO2 needs to be separated from a CO2/H2/N2 gas stream at high pressure (∼1000–1500 kPa) and with a high CO2 concentration (∼20–40 vol %). Data on the pure component isotherms were correlated using the Langmuir, Sips, and dual-site Langmuir (DSL) models, i.e., a two-, three-, and four-parameter model, respectively. By using the pure component isotherm fitting parameters, adsorption equilibrium was then predicted for multicomponent gas mixtures by the extended ...
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Precombustion co2 capture by means of phenol formaldehyde resin derived carbons from equilibrium to dynamic conditions
Separation and Purification Technology, 2012Co-Authors: C F Martin, Susana Garcia, J J Pis, F Rubiera, D Beneroso, C PevidaAbstract:Abstract The performance of two phenol–formaldehyde resin-based activated carbons prepared in our laboratory, as potential adsorbents for Precombustion CO 2 capture has been evaluated under static (adsorption isotherms) and dynamic (adsorption–desorption cycles conducted in a fixed bed) conditions. Most of the literature on CO 2 capture with solid sorbents is based on equilibrium CO 2 adsorption capacities, determined from CO 2 adsorption isotherms at the desired temperature. However, dynamic testing is required to ascertain the extent to which the equilibrium uptake may be translated into breakthrough capacity. CO 2 and H 2 adsorption isotherms up to 30 bar were determined in a high-pressure magnetic suspension balance. Equilibrium CO 2 uptakes at 15 bar of up to 8.5 mmol g −1 at 298 K and 7 mmol g −1 at 318 K were attained. Adsorption–desorption cycles by means of pressure and temperature swings were conducted with a simulated shifted-syngas in a purpose-built fixed-bed set-up. With a ternary mixture of CO 2 /H 2 /N 2 , breakthrough capacities at a total pressure of 15 bar reached 6.5 mmol g −1 at 298 K and 5.8 mmol g −1 at 318 K. These figures point out the suitability of these adsorbents to be applied to Precombustion CO 2 capture by means of a PSA process.
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doped phenol formaldehyde resins as precursors for Precombustion co2 capture adsorbents
Energy Procedia, 2011Co-Authors: C F Martin, Susana Garcia, J J Pis, F Rubiera, C PevidaAbstract:The use of solid sorbents for Precombustion CO2 capture, which implies the removal of CO2 from the shifted-syngas prior to electricity generation, has acquired increasing interest in recent years. As an alternative method for Precombustion CO2 capture, adsorption can be considered a promising technology, offering potential energy savings compared to absorbent systems. Solid sorbents are currently used in pressure swing adsorption (PSA) systems for the purification of hydrogen in petrochemical industries. In the present work, phenol formaldehyde resin-based adsorbents have been prepared to be applied in Precombustion CO2 capture applications. The produced carbons showed superior performance when compared to commercial CO2 adsorbents and a great selectivity towards CO2.
Christopher P. Goyne - One of the best experts on this subject based on the ideXlab platform.
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Shock-tunnel skin-friction measurement in a supersonic combustor
Journal of Propulsion and Power, 1999Co-Authors: Christopher P. Goyne, Raymond J. Stalker, Allan PaullAbstract:Shock-tunnel measurements are reported of skin friction with supersonic hydrogen-air combustion in a constant area duct. A floating-element skin-friction gauge was used, in which the shear force was applied directly to a piezoceramic measuring element. The experiments were conducted at stagnation enthalpies of 5.7 and 6.8 MJ kg(-1), a Precombustion Mach number of similar to 4.5, and with a maximum duct Reynolds number of 1.3 x 10(7). The measurements showed that, although supersonic combustion caused the skin friction to fluctuate with time, it did not affect the mean value of the skin friction coefficient, and this mean value could be predicted using existing turbulent: boundary-layer theory. Measurements of heat transfer also established that Reynolds analogy could be used in both the fuel-off and fuel-on flows.
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Shock tunnel skin friction measurement in a supersonic combustor
36th AIAA Aerospace Sciences Meeting and Exhibit, 1998Co-Authors: Christopher P. Goyne, Raymond J. Stalker, Allan PaullAbstract:Shock tunnel measurements are reported of skin friction with supersonic hydrogen-air combustion in a constant area duct. A floating element skin friction gauge was used, in which the shear force was applied directly to a piezoceramic measuring element. The experiments were conducted at stagnation enthalpies of 5.7 and 6.8 MJ kg, a Precombustion Mach number of approximately 4.5, and with a maximum duct Reynolds number of 1.3x10. The measurements showed that the skin friction coefficient was unaffected by supersonic combustion, and could be predicted by the correlation of Spalding and Chi. Measurements of heat transfer also established that Reynolds analogy could be used in both the fuel-off and fuel-on flows.
Mahinder Ramdin - One of the best experts on this subject based on the ideXlab platform.
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Solubility of the Precombustion gases CO2, CH4, CO, H2, N2, and H2S in the ionic liquid [bmim][Tf2N] from Monte Carlo simulations
Journal of Physical Chemistry C, 2014Co-Authors: Mahinder Ramdin, Sayee Prasaad Balaji, Juan José Gutiérrez-sevillano, J. M. Vicent-luna, Theo W. De Loos, Sofia Calero, Thijs J. H. VlugtAbstract:Monte Carlo simulations were used to compute the solubility of the pure gases CO2, CH4, CO, H2, N2, and H2S in the ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [bmim][Tf2N]. Simulations in the osmotic ensemble were performed to compute absorption isotherms at a temperature of 333.15 K using the versatile continuous fractional component Monte Carlo (CFCMC) method. The predicted gas solubilities and Henry constants are in good agreement with the experimental data. The Monte Carlo simulations correctly predict the observed solubility trend, which obeys the following order: H2S > CO2 > CH4 > CO > N2 > H2. Relevant separation selectivities for the Precombustion process are calculated from the pure gas Henry constants and a comparison with experimental data is provided.
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Solubility of the Precombustion Gases CO2, CH4, CO, H2, N2, and H2S in the Ionic Liquid [bmim][Tf2N] from Monte Carlo Simulations
2014Co-Authors: Mahinder Ramdin, J. M. Vicent-luna, Theo W. De Loos, Sayee Prasaad Balaji, Juan José Gutiérrez-sevillano, Sofía Calero, Thijs J. H. VlugtAbstract:Monte Carlo simulations were used to compute the solubility of the pure gases CO2, CH4, CO, H2, N2, and H2S in the ionic liquid (IL) 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide [bmim][Tf2N]. Simulations in the osmotic ensemble were performed to compute absorption isotherms at a temperature of 333.15 K using the versatile continuous fractional component Monte Carlo (CFCMC) method. The predicted gas solubilities and Henry constants are in good agreement with the experimental data. The Monte Carlo simulations correctly predict the observed solubility trend, which obeys the following order: H2S > CO2 > CH4 > CO > N2 > H2. Relevant separation selectivities for the Precombustion process are calculated from the pure gas Henry constants and a comparison with experimental data is provided