The Experts below are selected from a list of 243 Experts worldwide ranked by ideXlab platform
Bingxi Li - One of the best experts on this subject based on the ideXlab platform.
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Exergy distribution characteristics of solar-Thermal Dissociation of NiFe2O4 in a solar reactor
Energy, 2017Co-Authors: Xing Huang, Jiarong Hong, Yaning Zhang, Yong Shuai, Yuan Yuan, Bingxi LiAbstract:Exergy is an efficient tool for evaluating the quality of energy, and it plays an important role in reducing irreversible losses, improving energy efficiencies, saving energy sources and reducing pollution emissions for energy utilization systems. This study furthered an investigation of exergy distribution characteristics of NiFe2O4 solar-Thermal Dissociation in the solar reactor using User Define Function (UDF) technique in Fluent. The analysis was based on the previous results including temperature, velocity and species concentration during the solar Thermal Dissociation of NiFe2O4 in a solar reactor. In addition, the effects of reactant particle diameter, particle flow rate and aperture gas temperature on the physical and chemical exergy distributions were also studied. The results showed that with the increasing in particle diameter, a lower physical exergy region gradually forms around the axial centerline in the solar reactor and the value of chemical exergy decreases sharply. Both the increasing in particle mass flow rate and aperture gas temperature reduce the low value of physical exergy distribution and increase the value of chemical exergy due to the high conversion rate. There is an increasing limitation for mass flow rate of particles and gas temperature. But the increasing limitation needs further investigation by considering coupling the effects of the above operating parameters. The results obtained from this study gave basic knowledge of exergy distribution characteristics for solar-Thermal Dissociation processes and found a theoretical basis for structural optimization of solar reactors.
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heat transfer analysis of solar Thermal Dissociation of nife2o4 by coupling mcrtm and fvm method
Energy Conversion and Management, 2015Co-Authors: Xing Huang, Yong Shuai, Yuan Yuan, Xiang Chen, Tong Zhang, Bingxi LiAbstract:Abstract NiFe 2 O 4 is a promising candidate that used in solar thermochemical hydrogen production due to its better redox performance. The solar-Thermal Dissociation processes of NiFe 2 O 4 are analyzed by the Monte Carlo Ray Tracing Method (MCRTM) and Finite Volume Method (FVM), taking into account the conduction, convection, radiation and chemical reaction. More, the chemical co-precipitation method is employed to synthesize nanoscale NiFe 2 O 4 and combine experimental and numerical method to determine its radiative properties. The metallic oxide Dissociation solution obtained from the MCRTM and the FVM is compared with that from other methods in order to validate the MCRTM and the FVM for heat transfer analysis of solar-Thermal Dissociation. Finally, parametrical studies using the method are used to provide advices for structural designs of a new proposed solar reactor. The results can provide useful application for improving the efficiency of conversion from solar energy to chemical energy in the future.
G A Rozgonyi - One of the best experts on this subject based on the ideXlab platform.
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segregation and Thermal Dissociation of hydrogen at the 110 001 silicon grain boundary
Electronic Materials Letters, 2010Co-Authors: Yongkook Park, Jinggang Lu, G A RozgonyiAbstract:In this article, segregation and Thermal Dissociation kinetics of hydrogen at a large-angle general grain boundary in crystalline silicon have been investigated using deuterium, a readily identifiable isotope that duplicates hydrogen chemistry. Segregation or trapping of introduced deuterium (hydrogen) was found to take place at the (110)/(001) Si grain boundary. The segregation coefficient (k) of deuterium (hydrogen) at the grain boundary was determined as k≈24±3 at 100°C. Thermal Dissociation of deuterium (hydrogen) from the grain boundary obeyed first-order kinetics with an activation energy of ∼1.62 eV.
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Segregation and Thermal Dissociation of hydrogen at the (110)/(001) silicon grain boundary
Electronic Materials Letters, 2010Co-Authors: Yongkook Park, Jinggang Lu, G A RozgonyiAbstract:In this article, segregation and Thermal Dissociation kinetics of hydrogen at a large-angle general grain boundary in crystalline silicon have been investigated using deuterium, a readily identifiable isotope that duplicates hydrogen chemistry. Segregation or trapping of introduced deuterium (hydrogen) was found to take place at the (110)/(001) Si grain boundary. The segregation coefficient (k) of deuterium (hydrogen) at the grain boundary was determined as k≈24±3 at 100°C. Thermal Dissociation of deuterium (hydrogen) from the grain boundary obeyed first-order kinetics with an activation energy of ∼1.62 eV.
Xing Huang - One of the best experts on this subject based on the ideXlab platform.
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Exergy distribution characteristics of solar-Thermal Dissociation of NiFe2O4 in a solar reactor
Energy, 2017Co-Authors: Xing Huang, Jiarong Hong, Yaning Zhang, Yong Shuai, Yuan Yuan, Bingxi LiAbstract:Exergy is an efficient tool for evaluating the quality of energy, and it plays an important role in reducing irreversible losses, improving energy efficiencies, saving energy sources and reducing pollution emissions for energy utilization systems. This study furthered an investigation of exergy distribution characteristics of NiFe2O4 solar-Thermal Dissociation in the solar reactor using User Define Function (UDF) technique in Fluent. The analysis was based on the previous results including temperature, velocity and species concentration during the solar Thermal Dissociation of NiFe2O4 in a solar reactor. In addition, the effects of reactant particle diameter, particle flow rate and aperture gas temperature on the physical and chemical exergy distributions were also studied. The results showed that with the increasing in particle diameter, a lower physical exergy region gradually forms around the axial centerline in the solar reactor and the value of chemical exergy decreases sharply. Both the increasing in particle mass flow rate and aperture gas temperature reduce the low value of physical exergy distribution and increase the value of chemical exergy due to the high conversion rate. There is an increasing limitation for mass flow rate of particles and gas temperature. But the increasing limitation needs further investigation by considering coupling the effects of the above operating parameters. The results obtained from this study gave basic knowledge of exergy distribution characteristics for solar-Thermal Dissociation processes and found a theoretical basis for structural optimization of solar reactors.
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heat transfer analysis of solar Thermal Dissociation of nife2o4 by coupling mcrtm and fvm method
Energy Conversion and Management, 2015Co-Authors: Xing Huang, Yong Shuai, Yuan Yuan, Xiang Chen, Tong Zhang, Bingxi LiAbstract:Abstract NiFe 2 O 4 is a promising candidate that used in solar thermochemical hydrogen production due to its better redox performance. The solar-Thermal Dissociation processes of NiFe 2 O 4 are analyzed by the Monte Carlo Ray Tracing Method (MCRTM) and Finite Volume Method (FVM), taking into account the conduction, convection, radiation and chemical reaction. More, the chemical co-precipitation method is employed to synthesize nanoscale NiFe 2 O 4 and combine experimental and numerical method to determine its radiative properties. The metallic oxide Dissociation solution obtained from the MCRTM and the FVM is compared with that from other methods in order to validate the MCRTM and the FVM for heat transfer analysis of solar-Thermal Dissociation. Finally, parametrical studies using the method are used to provide advices for structural designs of a new proposed solar reactor. The results can provide useful application for improving the efficiency of conversion from solar energy to chemical energy in the future.
Yongkook Park - One of the best experts on this subject based on the ideXlab platform.
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segregation and Thermal Dissociation of hydrogen at the 110 001 silicon grain boundary
Electronic Materials Letters, 2010Co-Authors: Yongkook Park, Jinggang Lu, G A RozgonyiAbstract:In this article, segregation and Thermal Dissociation kinetics of hydrogen at a large-angle general grain boundary in crystalline silicon have been investigated using deuterium, a readily identifiable isotope that duplicates hydrogen chemistry. Segregation or trapping of introduced deuterium (hydrogen) was found to take place at the (110)/(001) Si grain boundary. The segregation coefficient (k) of deuterium (hydrogen) at the grain boundary was determined as k≈24±3 at 100°C. Thermal Dissociation of deuterium (hydrogen) from the grain boundary obeyed first-order kinetics with an activation energy of ∼1.62 eV.
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Segregation and Thermal Dissociation of hydrogen at the (110)/(001) silicon grain boundary
Electronic Materials Letters, 2010Co-Authors: Yongkook Park, Jinggang Lu, G A RozgonyiAbstract:In this article, segregation and Thermal Dissociation kinetics of hydrogen at a large-angle general grain boundary in crystalline silicon have been investigated using deuterium, a readily identifiable isotope that duplicates hydrogen chemistry. Segregation or trapping of introduced deuterium (hydrogen) was found to take place at the (110)/(001) Si grain boundary. The segregation coefficient (k) of deuterium (hydrogen) at the grain boundary was determined as k≈24±3 at 100°C. Thermal Dissociation of deuterium (hydrogen) from the grain boundary obeyed first-order kinetics with an activation energy of ∼1.62 eV.
R C Cohen - One of the best experts on this subject based on the ideXlab platform.
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laboratory evaluation of a novel Thermal Dissociation chemiluminescence method for in situ detection of nitrous acid
Atmospheric Environment, 2007Co-Authors: Idalia M Perez, P J Wooldridge, R C CohenAbstract:Abstract We describe a new laboratory-based method for in situ detection of nitrous acid (HONO) using a combination of Thermal Dissociation (TD) and chemiluminescent (CL) detection of nitric oxide. A prototype was built using a commercial NO sensor. Laboratory tests for possible chemical interferences show that measurements are affected in predictable ways by NO 2 , peroxy nitrates, alkyl nitrates, HNO 3 , O 3 and H 2 O .
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a Thermal Dissociation laser induced fluorescence instrument for in situ detection of no2 peroxy nitrates alkyl nitrates and hno3
Journal of Geophysical Research, 2002Co-Authors: P J Wooldridge, R C Cohen, M B Dillon, J A ThorntonAbstract:[1] This paper describes a new instrument that uses a combination of Thermal Dissociation and laser-induced fluorescence detection of NO2 for in situ detection of the sum total peroxy nitrates, the sum total of alkyl nitrates and hydroxyalkyl nitrates, and HNO3. The instrument is capable of routine, continuous in situ measurements of these three classes of compounds that are accurate (15%) with a low detection limit (90 parts per trillion (ppt) 10 s−1, S/N ratio = 2 on a background of 1 ppb NO2 and 30 ppt 10 s−1 on a background of 100 ppt NO2). Theoretical analysis of potential interferences combined with laboratory experiments that test for interferences show that rapidly cooling the gas and dropping the pressure after the Thermal Dissociation reduces interferences to the order of 1–5%. Observations in ambient air at the University of California Blodgett Forest Research Station demonstrate the capabilities of this instrument under field conditions. These field observations are compared with independent total NOy observations.
