The Experts below are selected from a list of 12615 Experts worldwide ranked by ideXlab platform
Shintaro Hinata - One of the best experts on this subject based on the ideXlab platform.
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Fiber optic sensor for liquid Mixture Composition
Fluid Phase Equilibria, 1992Co-Authors: B. Zhou, J.e.s. Venart, Shintaro HinataAbstract:Information on the concentration and temperature distributions is important in the study of the heat and mass transfer in liquid Mixture systems. This paper reports on a miniature optical fiber sensor that continuously measures the concentration of the liquid Mixture. It is found that the reproducibility of sensor is very good and that the concentration of the liquid Mixture can be measured with a long time reproducibility of 0.1%. The relationship between measuring sensitivity and concentration is investigated. The influence of temperature on the measurement is also examined. An application of the sensor to the continuous measurement of liquid Mixture concentration in a double diffusive convection system is described. © 1992.
Jisoo Ha - One of the best experts on this subject based on the ideXlab platform.
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flame characteristics in h2 co synthetic gas diffusion flames diluted with co2 effects of radiative heat loss and Mixture Composition
International Journal of Hydrogen Energy, 2008Co-Authors: Jeong Park, Sang In Keel, Jisoo HaAbstract:Abstract Numerical study is conducted to understand the impact of fuel Composition and flame radiation in flame structure and their oxidation process in H 2 /CO synthetic gas diffusion flame with and without CO 2 dilution. The models of Sun et al. and David et al., which have been well known to be best-fitted for H 2 /CO synthetic Mixture flames, are evaluated for H 2 /CO synthetic Mixture flames diluted with CO 2 . Effects of radiative heat loss to flame characteristics are also examined in terms of syngas Mixture Composition. Importantly contributing reaction steps to heat release rate are compared for the synthetic gas Mixture flames of high contents of H 2 and CO, individually, with and without CO 2 dilution. The modification of the oxidation pathways is also addressed.
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Flame characteristics in H2/CO synthetic gas diffusion flames diluted with CO2: Effects of radiative heat loss and Mixture Composition
International Journal of Hydrogen Energy, 2008Co-Authors: Jeong Park, Sang In Keel, Jisoo HaAbstract:Abstract Numerical study is conducted to understand the impact of fuel Composition and flame radiation in flame structure and their oxidation process in H 2 /CO synthetic gas diffusion flame with and without CO 2 dilution. The models of Sun et al. and David et al., which have been well known to be best-fitted for H 2 /CO synthetic Mixture flames, are evaluated for H 2 /CO synthetic Mixture flames diluted with CO 2 . Effects of radiative heat loss to flame characteristics are also examined in terms of syngas Mixture Composition. Importantly contributing reaction steps to heat release rate are compared for the synthetic gas Mixture flames of high contents of H 2 and CO, individually, with and without CO 2 dilution. The modification of the oxidation pathways is also addressed.
Gadhiraju Venkatarathnam - One of the best experts on this subject based on the ideXlab platform.
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Studies on the performance of a small reciprocating compressor with different nitrogen–hydrocarbon Mixtures
International Journal of Refrigeration-revue Internationale Du Froid, 2013Co-Authors: N. Lakshmi Narasimhan, Gadhiraju VenkatarathnamAbstract:Abstract The performance of Joule–Thomson refrigerators operating with mixed refrigerants depends on the Composition of Mixtures as well as the hardware employed. The role of Mixture Composition on the overall performance of the system has been well addressed in the open literature. What is not well known is the role of Mixture Composition on the performance of individual components such as the compressor, heat exchanger, etc. The adiabatic efficiency of a single stage Joule–Thomson refrigerator compressor was measured with thirty different nitrogen–hydrocarbon and neon–nitrogen–hydrocarbon Mixtures. Our results show that the adiabatic efficiency of the compressor is independent of the Mixture Composition in the range of pressure ratios tested.
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Effect of Mixture Composition and hardware on the performance of a single stage JT refrigerator
Cryogenics, 2011Co-Authors: N. Lakshmi Narasimhan, Gadhiraju VenkatarathnamAbstract:Abstract The specific refrigeration effect that can be obtained in a single stage mixed refrigerant Joule–Thomson refrigerator is strongly dependent on the Composition of Mixture used. Comprehensive methods have been developed over the last two decades to determine the Mixture Composition that results in the highest exergy efficiency or the refrigeration produced. However, what is not well known is the relationship between the Mixture Composition and the hardware, which ultimately decides the performance of the refrigerator. Experiments were conducted with seven different nitrogen–hydrocarbon Mixtures in a single stage JT refrigerator to understand the effect of both Composition and hardware on the performance of the refrigerator, the results of which are presented in this paper.
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Relationship between the cooldown characteristics of J–T refrigerators and Mixture Composition
Cryogenics, 2010Co-Authors: K. Rajesh Reddy, S. Srinivasa Murthy, Gadhiraju VenkatarathnamAbstract:Abstract The performance of Joule–Thomson (J–T) refrigerators is strongly influenced by the Composition of the refrigerant Mixture used. The Mixture Composition changes if leaks occur, or when a silica-gel drier is used in the system. In this experimental study, we show how the Composition changes can be estimated from the cooldown characteristics of J–T refrigerators without using a gas chromatograph. A novel way of representing the cooldown characteristics of J–T refrigerators is presented. The variation of compressor power during the cooldown is also discussed. The results presented here are useful for developers as well as field service engineers in selectively modifying the Composition without discarding the entire Mixture.
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Optimum Mixture Composition
International Cryogenics Monograph Series, 2008Co-Authors: Gadhiraju VenkatarathnamAbstract:The exergy efficiency of any mixed refrigerant process depends on the Mixture’s constituents and their concentration. The exergy efficiency of MRC refrigerators will be high when a second liquid phase occurs in the evaporator. Liquid-liquid immiscibility is observed at low temperatures in multicomponent Mixtures of nitrogen–hydrocarbon, fluorocarbon–hydrocarbon, fluorocarbon–hydrochlorofluorocarbon and fluorocarbon–hydrofluorocarbon refrigerants [34, 55, 87, 89]. This immiscibility can be exploited to obtain a near-constant temperature evaporation with Mixtures, as shown in Figs. 3.4 and 3.6 with both binary and multicomponent Mixtures.
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Effect of Mixture Composition on the formation of pinch points in condensers and evaporators for zeotropic refrigerant Mixtures
International Journal of Refrigeration-revue Internationale Du Froid, 1999Co-Authors: Gadhiraju Venkatarathnam, S. Srinivasa MurthyAbstract:Abstract In a recent study, it was shown by the authors that perfect glide matching of heat transfer fluid and the refrigerant is difficult in condensers and evaporators for many zeotropic Mixtures and also that pinch points can occur in both the condensers and evaporators due to the non-linear variation of enthalpy during phase change. Also, a simple method was presented for predicting the occurrence of pinch points. In this paper, the influence of Mixture Composition on occurrence of pinch points is studied. From the thermodynamic analysis, it is shown that multi-component Mixtures are preferable over many wide boiling binary Mixtures for various applications from the point of view of pinch points and glide matching. The results are illustrated with a number of examples.
B. Zhou - One of the best experts on this subject based on the ideXlab platform.
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Fiber optic sensor for liquid Mixture Composition
Fluid Phase Equilibria, 1992Co-Authors: B. Zhou, J.e.s. Venart, Shintaro HinataAbstract:Information on the concentration and temperature distributions is important in the study of the heat and mass transfer in liquid Mixture systems. This paper reports on a miniature optical fiber sensor that continuously measures the concentration of the liquid Mixture. It is found that the reproducibility of sensor is very good and that the concentration of the liquid Mixture can be measured with a long time reproducibility of 0.1%. The relationship between measuring sensitivity and concentration is investigated. The influence of temperature on the measurement is also examined. An application of the sensor to the continuous measurement of liquid Mixture concentration in a double diffusive convection system is described. © 1992.
Jeong Park - One of the best experts on this subject based on the ideXlab platform.
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flame characteristics in h2 co synthetic gas diffusion flames diluted with co2 effects of radiative heat loss and Mixture Composition
International Journal of Hydrogen Energy, 2008Co-Authors: Jeong Park, Sang In Keel, Jisoo HaAbstract:Abstract Numerical study is conducted to understand the impact of fuel Composition and flame radiation in flame structure and their oxidation process in H 2 /CO synthetic gas diffusion flame with and without CO 2 dilution. The models of Sun et al. and David et al., which have been well known to be best-fitted for H 2 /CO synthetic Mixture flames, are evaluated for H 2 /CO synthetic Mixture flames diluted with CO 2 . Effects of radiative heat loss to flame characteristics are also examined in terms of syngas Mixture Composition. Importantly contributing reaction steps to heat release rate are compared for the synthetic gas Mixture flames of high contents of H 2 and CO, individually, with and without CO 2 dilution. The modification of the oxidation pathways is also addressed.
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Flame characteristics in H2/CO synthetic gas diffusion flames diluted with CO2: Effects of radiative heat loss and Mixture Composition
International Journal of Hydrogen Energy, 2008Co-Authors: Jeong Park, Sang In Keel, Jisoo HaAbstract:Abstract Numerical study is conducted to understand the impact of fuel Composition and flame radiation in flame structure and their oxidation process in H 2 /CO synthetic gas diffusion flame with and without CO 2 dilution. The models of Sun et al. and David et al., which have been well known to be best-fitted for H 2 /CO synthetic Mixture flames, are evaluated for H 2 /CO synthetic Mixture flames diluted with CO 2 . Effects of radiative heat loss to flame characteristics are also examined in terms of syngas Mixture Composition. Importantly contributing reaction steps to heat release rate are compared for the synthetic gas Mixture flames of high contents of H 2 and CO, individually, with and without CO 2 dilution. The modification of the oxidation pathways is also addressed.
