10 results on '"Hyungman Kim"'
Search Results
2. The Effect of Relative Hydrogen Concentration on Catalytic Reaction over Platinum under Low Gravity Condition
- Author
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Hiroshi Enomoto, Michikata Kono, Hyungman Kim, and Toshikazu Kadota
- Subjects
Natural convection ,General Chemical Engineering ,General Physics and Astronomy ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Thermodynamics ,General Chemistry ,Mole fraction ,Nitrogen ,Catalysis ,Fuel Technology ,chemistry ,Thermocouple ,Polar coordinate system ,Platinum ,Axial symmetry - Abstract
Experiments were performed under low gravity condition in order to investigate the surface reaction model. A spherical platinum of 1.5 mm in diameter was used, and the surface temperature was measured by thermocouple. The mole fraction of nitrogen of the mixture was 0.91. As the effect of natural convection can be neglected under low gravity condition, the governing equations of mass, energy and species concentrations are formulated in one-dimensional polar coordinates. Axial symmetry, zero azimuthal velocity and no gradient along the axis are assumed. The low gravity condition of the present experiment was realized by the parabolic flight. The relative hydrogen concentration of the mixture was varied. If the relative hydrogen concentration is larger than 0.23, the numerical results simulated the experimental results successfully. However, at relative hydrogen concentration less than 0.23, the numerical results did not explain the experimental results well.
- Published
- 2001
3. The Effect of Ambient Pressure on Catalytic Reaction over Platinum
- Author
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Hyungman Kim, Toshikazu Kadota, Michikata Kono, and Hiroshi Enomoto
- Subjects
Fluid Flow and Transfer Processes ,Convection ,Natural convection ,Materials science ,Hydrogen ,Mechanical Engineering ,chemistry.chemical_element ,Thermodynamics ,Thermal conduction ,chemistry ,Steady state (chemistry) ,Physics::Chemical Physics ,Physical and Theoretical Chemistry ,Total pressure ,Inert gas ,Ambient pressure - Abstract
A surface reaction occurs at a certain surface temperature when the catalyst is heated up in a reactive mixture. If homogeneous ignition does not occur, a steady state is observed because the heat produced by the surface reaction is balanced with the heat loss caused by convection, conduction and radiation. The steady temperature was defined as the temperature at the steady state. This paper treated the pressure effects on the surface reaction. Hydrogen and oxygen were used as reactants and nitrogen as an inert gas. A spherical platinum catalyst of 1.5 mm in diameter was sustained in the chamber with two wires of 0.1 mm in diameter. As results, there was a maximum steady temperature at a certain relative hydrogen concentration (αmax) and αmax increased with the total pressure. At the steady state, it could be approximated that the heat release was estimated by the mass transfer considering the effect of natural convection. The experimental results could be explained qualitatively by the approximation.
- Published
- 2000
4. The Effect of Catalytic Reaction on Hot Surface Ignition
- Author
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Hiroshi Enomoto, Mitsuhiro Tsue, Michikata Kono, Hyungman Kim, and Hideki Kato
- Subjects
Materials science ,Analytical chemistry ,chemistry.chemical_element ,Combustion ,Methane air ,Methane ,Catalysis ,law.invention ,chemistry.chemical_compound ,Condensed Matter::Materials Science ,Physics::Plasma Physics ,law ,Physics::Atomic and Molecular Clusters ,Physical and Theoretical Chemistry ,Physics::Chemical Physics ,Fluid Flow and Transfer Processes ,Range (particle radiation) ,Mechanical Engineering ,Condensed Matter Physics ,Ignition system ,Minimum ignition energy ,Nickel ,chemistry ,Platinum ,Stoichiometry ,Equivalence ratio - Abstract
The hot surface ignition of methane air mixtures in microgravity has been studied experimentally and numerically. Experiments on the ignition of the mixtures with electrically heated nickel wires and platinum wires in microgravity have been performed. Numerical calculations, including the catalytic reaction rate for platinum, have been performed to understand the experimental results obtained in microgravity. The ignition delays and ignition temperatures for a wide range of equivalence ratios were investigated. Experimental results show that the ignition temperatures with platinum wires have a maximum near the stoichiometric mixture ratio, while those with nickel wires increase as the equivalence ratio increases. Ignition temperatures with platinum wires are higher than those with nickel wires. Numerical results show that reactants next to platinum wires are consumed by the catalytic reaction. Therefore, a higher temperature is required to ignite mixtures with platinum wires. The catalytic inhibition of hot surface ignition is simulated successfully by the numerical model.
- Published
- 1997
5. Characteristics of Ignition of Combustible Mixture with Platinum Catalyst
- Author
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Michikata Kono, Hideki Kato, Hyungman Kim, and Hiroshi Enomoto
- Subjects
Materials science ,Mechanical Engineering ,Analytical chemistry ,chemistry.chemical_element ,Autoignition temperature ,Condensed Matter Physics ,Mole fraction ,law.invention ,Catalysis ,Ignition system ,Minimum ignition energy ,chemistry ,Physics::Plasma Physics ,law ,Thermocouple ,Physics::Chemical Physics ,Total pressure ,Platinum - Abstract
In order to investigate the effects of equivalence ratio and total pressure on hot catalytic surface ignition, experimental and numerical studies were conducted. A platinum sphere of 1.5 mm diameter was used as the catalyst. Premixed gases contained hydrogen, oxygen and nitrogen. The mole fraction of nitrogen was 75% in all cases. Surface temperature of the platinum catalyst was measured by a thermocouple. A photodiode was used to detect the ignition. In this paper, ignition temperature was defined as the output of the thermocouple at which ignition occurred. When total pressure decreased, ignition temperature increased and the effect of equivalence ratio changed. This seems to be caused by the difference in diffusion characteristics of dominant species.
- Published
- 1997
6. Ignition of Methane-Air Mixtures by Isothermal Hot Wires
- Author
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Hideki Kato, Hyungman Kim, Mitsuhiro Tsue, Michikata Kono, and Hiroshi Enomoto
- Subjects
Natural convection ,Chemistry ,chemistry.chemical_element ,Thermodynamics ,Isothermal process ,Catalysis ,law.invention ,Ignition system ,Condensed Matter::Materials Science ,Nickel ,Minimum ignition energy ,General Energy ,Physics::Plasma Physics ,law ,Physics::Chemical Physics ,Platinum ,Stoichiometry - Abstract
Hot surface ignition of methane-air mixtures has been experimentally studied in normal gravity and microgravity. The primary aim of this research is to explain the effects of natural convection and catalytic reaction on the hot surface ignition in a closed vessel. The hot surfaces used are platinum wire for catalyst and nickel wire for non-catalyst. In order to define the initial condition and make the analysis simple, the following control unit was developed; which heats the wire to the setting temperature in a very short time, and maintains the wire temperature constant until ignition. From experimental results, ignition temperatures with platinum wire are higher than those with nickel wire by the catalytic inhibition of ignition due to the reactant depletion on the surface of the wire. Ignition temperatures with platinum wire are highest near the stoichiometric mixture ratio and decrease with equivalence ratio depart from stoichiometric mixture ratio, while those with nickel wire increase with equivalence ratio. Ignition temperatures in normal gravity are higher than those in microgravity. Natural convection supplies reactants to the platinum wire surface, and therefore reactants are consumed because of promoting catalytic reaction in normal gravity.
- Published
- 1997
7. Pressure Effects on Hydrogen-Oxygen Reaction over Platinum Catalytic Surface
- Author
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Mitsuhiro Tsue, Hyungman Kim, Michikata Kono, Hiroshi Enomoto, and Hideki Kato
- Subjects
Convection ,General Energy ,Natural convection ,Hydrogen ,Chemistry ,chemistry.chemical_element ,Thermodynamics ,Steady state (chemistry) ,Total pressure ,Thermal conduction ,Inert gas ,Oxygen - Abstract
A surface reaction occurs at a certain surface temperature when the catalyst is heated up in a reactive mixture. If homogeneous ignition does not occur, a steady state is observed because the heat produced by the surface reaction is balanced with the heat loss caused by convection, conduction and radiation. The steady temperature is defined as the temperature at the steady state. This paper treats the pressure effects on the surface reaction. Hydrogen and oxygen are used as reactants and nitrogen as an inert gas. The height, width and length of the combustion chamber are 76 mm, 140 mm and 140 mm, respectively. A spherical Pt catalyst sample of 1.5 mm in diameter is sustained in the chamber with two wires of 0.1 mm in diameter. As results, there is a maximum steady temperature at a certain equivalence ratio (ERmax) and ERmax increases with total pressure. At the steady state, it can be approximated that the heat release is evaluated by the mass transfer which includes the effect of natural convection. The experimental results could be explained qualitatively by the approximation.
- Published
- 1996
8. A Study of Surface Reaction of Hydrogen-Oxygen with Platinum Catalyst
- Author
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Hyungman Kim, Hiroshi Enomoto, Michikata Kono, and Hideki Kato
- Subjects
General Energy ,Adsorption ,chemistry ,Atmospheric pressure ,Hydrogen ,Analytical chemistry ,chemistry.chemical_element ,Steady state (chemistry) ,Thermal conduction ,Inert gas ,Oxygen ,Catalysis - Abstract
A surface reaction occurs on a catalyst surface when the catalyst sample is heated up to a certain temperature in a reactive mixture. After the surface reaction occurs, a steady state is observed without energy supply because the heat produced by the surface reaction is balanced with the heat loss caused by convection, conduction and radiation. The heat release of the surface reaction can be evaluated by the surface temperature of the catalyst sample at the steady state.This paper treats the effects of the equivalence ratio (ER) and the dilution ratio (DR) of the reactive mixture on the surface reaction. Hydrogen and oxygen are used as reactive mixture and nitrogen as inert gas. The height, width and length of the combustion chamber are 76mm, 140mm and 140mm, respectively. A spherical Pt catalyst sample of 1.5mm in diameter is sustained in the chamber with two wires of 0.1 mm in diameter. The chamber is filled with a hydrogen-oxygen-nitrogen mixture at the atmospheric pressure and the room temperature. The surface temperature is measured with a thermocouple. As the results, the heat produced by the surface reaction decreases with increasing dilution ratio, and hydrogen is adsorbed more easily compared with oxygen.
- Published
- 1995
9. An Analytical Approach to the Analysis of Guard-Channel-Based Call Admission Control in Wireless Cellular Networks
- Author
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Che Soong Kim, HyungMan Kim, Mehriban I. Fattakhova, and Agassi Z. Melikov
- Subjects
Scheme (programming language) ,SIMPLE (military communications protocol) ,Article Subject ,Computer science ,Wireless cellular networks ,business.industry ,Applied Mathematics ,Quality of service ,Call Admission Control ,lcsh:Mathematics ,lcsh:QA1-939 ,Handover ,business ,Guard channel ,computer ,computer.programming_language ,Channel occupancy ,Computer network - Abstract
We develop an analytical approach to the performance analysis and optimization of wireless cellular networks for which different types of calls are prioritized based on a channel reservation scheme. We assume that the channel occupancy time differs for new and handover calls. We obtain simple formulas for calculating quality of service (QoS) metrics and solve some problems related to finding the optimal values of guard channels as well as present the results of numerical experiments.
- Published
- 2012
10. Experimental investigation of the influences of shape and surface area on the EGR cooler efficiency.
- Author
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Sanghoon Jang, Sangki Park, Kapseung Choi, and Hyungman Kim
- Subjects
EMISSIONS (Air pollution) ,DYNAMOMETER ,HEAT exchangers ,HIGH temperatures ,NITROGEN oxides ,PARTICULATE matter - Abstract
The cooled EGR system is one of the most effective techniques currently available for reducing NO emissions. In this study, engine dynamometer experiments were performed to investigate the efficiencies of the shell and tube-type and stack-type EGR coolers. The results show that the heat exchange of the stack-type EGR cooler is much more effective than that of the shell and tube type because of the increased surface area and better mixing of the coolant flow, and also more PM is produced at low exhaust gas temperature than at high temperature. [ABSTRACT FROM AUTHOR]
- Published
- 2011
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