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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Korean Society of Mechanical Engineers B
Journal Basic Information
Journal DOI :
The Korean Society of Mechanical Engineers
Editor in Chief :
Volume & Issues
Volume 37, Issue 12 - Dec 2013
Volume 37, Issue 11 - Nov 2013
Volume 37, Issue 10 - Oct 2013
Volume 37, Issue 9 - Sep 2013
Volume 37, Issue 8 - Aug 2013
Volume 37, Issue 7 - Jul 2013
Volume 37, Issue 6 - Jun 2013
Volume 37, Issue 5 - May 2013
Volume 37, Issue 4 - Apr 2013
Volume 37, Issue 3 - Mar 2013
Volume 37, Issue 2 - Feb 2013
Volume 37, Issue 1 - Jan 2013
Selecting the target year
Study on Prediction of Performance with Design Variables of Solar-Assisted Still Using Waste Heat from Diesel Generator
Jang, Hyun ; Yi, Chung Seob ; Suh, Jeong Se ; Jeong, Kyoung Yul ; Park, Change Dae ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1061~1068
DOI : 10.3795/KSME-B.2013.37.12.1061
This study predicts distillate productions according to design variables by numerical analysis when the waste heat from a diesel generator is added to the solar-assisted still proposed in a previous study. Mathematical models were set up in reference to previous studies, and the amount of heat exchange from the waste heat recovery pipe was considered. To ensure the reliability of numerical analysis, the result was compared with that of a previous study and then, the distillate productions according to design variables were obtained by the analysis model. The results were found to generally be in agreement, and the increasing amount of distillate production of the still with the added waste heat was confirmed. In addition, the optimal value of the tilt angle of glass cover and the number of cells were determined by numerical analysis.
Investigation of Condensation Heat Transfer Correlation of Heat Exchanger Design in Secondary Passive Cooling System
Ju, Yun Jae ; Kang, Han-Ok ; Lee, Tae-Ho ; Park, Cheon-Tae ; Lee, Hee Joon ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1069~1078
DOI : 10.3795/KSME-B.2013.37.12.1069
Recently, condensation heat exchangers have been studied for applications to the passive cooling systems of nuclear plants. To design vertical-type condensation heat exchangers in secondary passive cooling systems, TSCON (Thermal Sizing of CONdenser), a thermal sizing program for a condensation heat exchanger, was developed at KAERI (Korea Atomic Energy Research Institute). In this study, the existing condensation heat transfer correlation of TSCON was evaluated using 1,157 collected experimental data points from the heat exchanger of a secondary passive cooling system for the case of pure steam condensation. The investigation showed that the Shah correlation, published in 2009, provided the most satisfactory results for the heat transfer coefficient with a mean absolute error of 34.8%. It is suggested that the Shah correlation is appropriate for designing a condensation heat exchanger in TSCON.
Numerical Study of Flow Characteristics in a Solid Particle Incinerator for Various Design Parameters of Injectors
Son, Jin Woo ; Kim, Su Ho ; Sohn, Chae Hoon ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1079~1089
DOI : 10.3795/KSME-B.2013.37.12.1079
The flow characteristics in a solid particle incinerator are investigated numerically for high burning rate of wastes. The studied incinerator employs both a swirl flow used in the furnace of powerplants and a design concept applied to a rocket combustor. As the first step, the non-reactive flow field is analyzed in the incinerator with primary and secondary injectors through which solid fuel and air are injected. The deflection angle of a primary injector, inclination angle of a secondary injector, and gap between the two types of injectors are selected as design parameters. The swirl number is adopted for evaluating the degree of swirl flow and estimated over wide ranges of three parameters. The swirl number increases with deflection angle, but it is affected little by inclination angle. Recirculation zones are formed near the injectors, and their size affects the swirl number. The swirl number decreases with the zonal size of recirculation. From the numerical results, the design points can be found with strong swirl flow.
Experimental and Numerical Study on the Capillary Performance of Non-Homogeneous Micro-Post Arrays
Byon, Chan ; Kim, Sung Jin ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1091~1097
DOI : 10.3795/KSME-B.2013.37.12.1091
In this article, an advanced cooling surface based on micro-post arrays with non-homogeneous configurations is investigated and compared with conventional micro-post arrays with homogeneous configuration. The capillary performance of micro-post arrays are characterized using the capillary rate of rise experiments and numerical simulations which take into account the meniscus curvature. The experimental and numerical results show that that the capillary performance of the micro-post wick can be significantly enhanced, compared with the homogeneous type wick, by employing non-homogeneous configurations. The capillary performance is shown to be primarily a function of the solid fraction and increases linearly with decreasing solid fraction, regardless of the wick configuration, when the solid fraction is larger than 0.25. However, the capillary performance is found to be significantly reduced when the solid fraction falls below approximately 0.25.
Study on Improvement of Air Conditioning Units for Anti Aircraft Gun Wheeled Vehicle
Jeon, Ki-Hyun ; Lee, Dong-Hui ; Lee, Boo-Hwan ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1099~1103
DOI : 10.3795/KSME-B.2013.37.12.1099
A combat vehicle needs to have an air-conditioning unit. Accordingly, new combat systems have tended to apply an integrated heating, cooling, and ventilating system. The air conditioning unit used depends on the combat vehicle's purpose of use. In this study, we studied an air-conditioning unit for an armored combat vehicle as a special use and military specification and tried to improve the air-conditioning unit's performance.
Study on Prediction of Solar Insolation and Heating Load
Yoo, Seong Yeon ; Kim, Tae Ho ; Han, Kyu Hyun ; Kim, Myung Ho ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1105~1112
DOI : 10.3795/KSME-B.2013.37.12.1105
In this study, a method for predicting heating loads using building characteristic coefficients is proposed for heating system control, and a method for predicting hourly temperature and solar insolation, which mainly affect building heating loads, is also proposed. The temperature and solar insolation are predicted by using a fuzzy theory from forecast information at the meteorological agency, and the building characteristic coefficients for the prediction of heating loads are derived from EnergyPlus. The simulated heating loads of the present study show good agreement with those of EnergyPlus. and the variations of the predicted heating loads using the predicted temperature and solar insolation are similar to those using the actual weather data.
Natural Convection in Tilted Square Enclosure with Inner Circular Cylinder at Different Vertical Locations
Jeong, Seung Jae ; Yoon, Hyun Sik ; Choi, Changyoung ; Ha, Man Young ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1113~1120
DOI : 10.3795/KSME-B.2013.37.12.1113
A numerical analysis of the effect of the position of a circular cylinder in a
tilted enclosure on natural convection in the enclosure is presented. The location of the cylinder is changed between -0.4 and 0.4. The Rayleigh number is varied between
. The effect of the location of the cylinder on natural convection in the enclosure is analyzed by the isothermal line, stream line, and surface-averaged Nusselt number. The flow and heat transfer characteristics are independent of time in the range of the Rayleigh number and cylinder location that is considered in this study. The surface-averaged Nusselt number of the cylinder and enclosure increases as the cylinder gets closer to the wall of the enclosure.
Functional Electrical Stimulation for Rehabilitation of a Shoulder Joint
Jeon, Jae Hyeon ; Kim, Jin Oh ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1121~1127
DOI : 10.3795/KSME-B.2013.37.12.1121
This study deals with experimental studies on electromyogram (EMG) measurements and functional electrical stimulation (FES) for the rehabilitation of a shoulder-joint. Based on the structure, motion, and main functions of the musculoskeletal system in a shoulder-joint, the muscles playing a major role for the motion in the sagittal plane were selected for the experiment. First, the surface electromyogram of the main muscles was measured according to the joint angle. The results showed that the change in the surface EMG was linearly proportional to the change in the joint angle. Second, the joint angle was measured during FES at shoulder muscles. The results showed that the joint angle increased as the FES current increased in a certain range of FES. It was confirmed that the willingness of muscles to move could be detected by measuring EMG and that the generation of muscle tension could be assisted by FES for active rehabilitation.
Effect of Low Calorific Natural Gas on Performance and Emission Characteristics of Engine
Lee, Sungwon ; Lim, Gihun ; Park, Cheolwoong ; Choi, Young ; Kim, Changgi ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1129~1135
DOI : 10.3795/KSME-B.2013.37.12.1129
In this, three types of natural gas were employed to investigate the effect of low-calorific natural gas on the performance of and emissions from a heavy-duty CNG engine. The performance and emission characteristics were analyzed by conducting a full-load test, WHSC mode test, and WHTC mode test. The results showed that the torque of low-calorific natural gas with
of higher heating value decreased by 4.4 compared to that of the current natural gas with
of heating value. With low-calorific fuels, CO,
emissions decreased. However, THC emissions increased. According to the WHSC and WHTC mode test results, the thermal efficiency increased and the emission characteristics showed a similar trend to the full-load test results. Low-calorific natural gases cause a decrease in torque at full-load operation conditions and an increase in hydrocarbon emissions.
Exergy Analysis of Vapor Compression Cycle Driven by Organic Rankine Cycle
Kim, Kyoung Hoon ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1137~1145
DOI : 10.3795/KSME-B.2013.37.12.1137
In this study, exergy analysis of a thermally activated refrigeration cycle, a combined organic Rankine cycle (ORC), and a vapor compression cycle (VCC) were conducted. It is considered that a system uses a low-temperature heat source in the form of sensible heat, such as various renewable energy sources or waste heat from industries, and one of eight working fluids: R143a, R22, R134a, propane, isobutane, butane, R245fa, or R123. The effects of turbine inlet pressure and the working fluid selected on the exergy destructions (anergies) at various system components as well as the COP and exergy efficiency of the system were analyzed and discussed. The results show that the component of the greatest exergy destruction in the system varies sensitively with the turbine inlet pressure and/or working fluid.
Effect of Insulation Coating on Start Time of Linear Region for Transient Hot-wire Method
Lee, Seung-Hyun ; Kim, Hyun Jin ; Kim, Kyu Han ; Park, Yong-Jun ; Jang, Seok Pil ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1147~1152
DOI : 10.3795/KSME-B.2013.37.12.1147
In this study, the effect of an insulation coating on the start time of a linear region is theoretically investigated when an insulation-coated hot-wire is used for the transient hot-wire method (THWM). For this purpose, important parameters affecting the start time of the linear region are presented from an analytical solution of temperature-rise for an insulation-coated hot-wire. Furthermore, a critical time to ignore the influence of important parameters is studied. The theoretical results indicate that the effect of the insulation coating rapidly disappears with a decrease in the wire radius, coating thickness, thermal diffusivity of insulation material or an increase in the thermal conductivity of the insulation material. The results of this study will be helpful for selecting a proper start time of the linear region for the THWM using insulation-coated hot-wires.
Damage Analysis for Last-Stage Blade of Low-Pressure Turbine
Song, Gee Wook ; Choi, Woo Sung ; Kim, Wanjae ; Jung, Nam Gun ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1153~1157
DOI : 10.3795/KSME-B.2013.37.12.1153
A steam turbine blade is one of the core parts in a power plant. It transforms steam energy into mechanical energy. It is installed on the rim of a rotor disk. Many failure cases have been reported at the final stage blades of a low-pressure (LP) turbine that is cyclically loaded by centrifugal force because of the repeated startups of the turbine. Therefore, to ensure the safety of an LP steam turbine blade, it is necessary to investigate the fatigue strength and life. In this study, the low cycle fatigue life of an LP steam turbine blade is evaluated based on actual damage analysis. To determine the crack initiation life of the final stage of a steam turbine, Neuber's rule is applied to elastic stresses by the finite element method to calculate the true strain amplitude. It is observed that the expected life and actual number of starts/stops of the blade were well matched.
Surface Smoothing of Blasted Glass Micro-Channels Using Abrasive Waterjet
Son, Sung-Gyun ; Han, Sol-Yi ; Sung, In-Ha ; Kim, Wook-Bae ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1159~1165
DOI : 10.3795/KSME-B.2013.37.12.1159
Powder blasting, which is an efficient micromachining method for glass, silicon, and ceramics, has a critical disadvantage in that the surface finish is poor owing to the brittle fracture of materials. Low-pressure waterjet machining can be applied to smoothen the rough surface inside the blasted structure. In this study, the surface roughness and sectional dimension of micro-channels are observed during the repetitive application of a waterjet to blasted micro-channels. The asperities and subsurface cracks created by blasting are removed by waterjet machining. Along with the surface roughness, it is found that the sectional dimension increases and the edges of the finished micro-channel become slightly round. Finally, a microfluidic chip is machined by the blasting-waterjet process and a transparent microfluidic channel is obtained efficiently.
Evaluation of Critical Flow Function by Using Helmholtz Free Energy for Natural Gas Flow Measurement
Ha, Young-Cheol ; Her, Jae-Young ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1167~1173
DOI : 10.3795/KSME-B.2013.37.12.1167
This study aimed to calculate the CFFs (critical flow functions) of a sonic nozzle bank with a 12-nozzle package within 1 s. Toward this end, the Helmholtz free energy of natural gas was formulated by using the AGA8-dc equation of state in a form without integral terms, and thereafter, thermodynamic properties such as the enthalpy, entropy, speed of sound, and heat capacity, which are used in CFF calculation, were derived in analytical form. As a result, the calculation time of CFFs was improved from 6.7 s in a previous study to 0.6 s per 12-nozzle package and kept almost constant regardless of the number of components in natural gas. Furthermore, it was confirmed that the calculated CFF values were in agreement with the results of a CFF international comparison test carried out under ISO management in 1998-1999.
Comparative Study of Commercial CFD Software Performance for Prediction of Reactor Internal Flow
Lee, Gong Hee ; Bang, Young Seok ; Woo, Sweng Woong ; Kim, Do Hyeong ; Kang, Min Ku ;
Transactions of the Korean Society of Mechanical Engineers B, volume 37, issue 12, 2013, Pages 1175~1183
DOI : 10.3795/KSME-B.2013.37.12.1175
Even if some CFD software developers and its users think that a state-of-the-art CFD software can be used to reasonably solve at least single-phase nuclear reactor safety problems, there remain limitations and uncertainties in the calculation result. From a regulatory perspective, the Korea Institute of Nuclear Safety (KINS) is presently conducting the performance assessment of commercial CFD software for nuclear reactor safety problems. In this study, to examine the prediction performance of commercial CFD software with the porous model in the analysis of the scale-down APR (Advanced Power Reactor Plus) internal flow, a simulation was conducted with the on-board numerical models in ANSYS CFX R.14 and FLUENT R.14. It was concluded that depending on the CFD software, the internal flow distribution of the scale-down APR was locally somewhat different. Although there was a limitation in estimating the prediction performance of the commercial CFD software owing to the limited amount of measured data, CFX R.14 showed more reasonable prediction results in comparison with FLUENT R.14. Meanwhile, owing to the difference in discretization methodology, FLUENT R.14 required more computational memory than CFX R.14 for the same grid system. Therefore, the CFD software suitable to the available computational resource should be selected for massively parallel computations.