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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
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Volume & Issues
Volume 40, Issue 9 - Sep 2016
Volume 40, Issue 8 - Aug 2016
Volume 40, Issue 7 - Jul 2016
Volume 40, Issue 6 - Jun 2016
Volume 40, Issue 5 - May 2016
Volume 40, Issue 4 - Apr 2016
Volume 40, Issue 3 - Mar 2016
Volume 40, Issue 2 - Feb 2016
Volume 40, Issue 1 - Jan 2016
Selecting the target year
Pool Boiling Enhancement of R-123 Using Perforated Plates
Kim, Nae-Hyun ;
Transactions of the Korean Society of Mechanical Engineers B, volume 40, issue 5, 2016, Pages 275~281
DOI : 10.3795/KSME-B.2016.40.5.275
In this study, we investigate the pool boiling enhancement caused by perforated plates on top of a smooth surface. We conduct tests using R-123 at atmospheric pressure. It was shown that perforated plates significantly enhanced the pool boiling of the smooth surface. The reason may be attributed to the increased bubble contact area between the plates. The results showed that the enhancement ratio was dependent on the heat flux. At high heat flux, the enhancement ratio increased as the porosity increased. However, at low heat flux, the enhancement ratio decreased as the porosity increased. For the present investigation, the optimum configuration had a pore diameter of 2.0 mm, pore pitch of
, and a gap width of 0.5 mm, which yielded heat-transfer coefficients that are close to those of GEWA-T. The optimum porosity for R-123 was significantly larger than that of water or ethanol. The reason for this may be the large liquid-to-vapor density ratio along with the small latent heat of vaporization of R-123. The perforated plates yielded smaller boiling hysteresis compared with that of the smooth surface.
Experimental Study on Design Parameters of Explosive-driven High-intensity Flash Generator
Kim, Kyung Sik ; Ahn, Jae-Woon ; Yang, Hui-Won ; Kwon, Mi-Ra ;
Transactions of the Korean Society of Mechanical Engineers B, volume 40, issue 5, 2016, Pages 283~288
DOI : 10.3795/KSME-B.2016.40.5.283
A non-lethal weapon is a device that can subdue targets without causing death or mortal wounds. A high-intensity flash generator can negate electro-optical sensors and cause temporal flash blindness with a high intensity of light. In this study, we derive the design parameters of an explosive-driven high-intensity flash generator that uses the interaction of plasma caused by the detonation of explosives with surrounding inert gas. To determine the design parameters of the flash generator, we analyze test results measured using optical sensors. The experimental results show that the light intensity of xenon gas is about four times higher than that of air. In addition, the intensity increases with the weight of the explosive, and the inert gas cross-sectional area encountered a shock wave in the airframe. The light intensity caused by a double-initiation generator is about two times higher than that of the single-initiation generator.
Study on the Development of Hybrid NMP Recovery System for Recovering the Used NMP in Lithium Ion Battery Cathode Manufacturing Process
Hwang, Soon Ho ; Nam, Seung Beak ; Kim, Dong-Kwon ; Kim, Yang Jun ; Kang, Sung Eun ;
Transactions of the Korean Society of Mechanical Engineers B, volume 40, issue 5, 2016, Pages 289~296
DOI : 10.3795/KSME-B.2016.40.5.289
The availability of NMP, a solvent used in the manufacturing process of cathode material for lithium ion battery, depends on importation, and the price remains high because of the monopoly of BASF and ISP. For these reasons, most Lithium ion battery manufacturers reuse NMP after recovering it from the exhaust air in the drying process. In Korea, absorption method is mainly used for recovering NMP from the absorption tower using the hydrophilicity of NMP. However, this system has a few disadvantages, such as low purity (80％) of the recovered NMP and 100％ emission due to high water content of the treated gas. In this study, we develop a hybrid NMP recovery system by combining cooling condensation method with concentration method, by which it is possible to obtain an NMP recovery rate of 99.6％, and a high purity (96.1％) of the recovered NMP.
Dynamic Model of Centrifugal Compressor for Prediction of Surge Evolution and Performance Variations
Jung, Mooncheong ; Han, Jaeyoung ; Yu, Sangseok ;
Transactions of the Korean Society of Mechanical Engineers B, volume 40, issue 5, 2016, Pages 297~304
DOI : 10.3795/KSME-B.2016.40.5.297
When a control algorithm is developed to protect automotive compressor surges, the simulation model typically selects an empirically determined look-up table. However, it is difficult for a control oriented empirical model to show surge characteristics of the super charger. In this study, a dynamic supercharger model is developed to predict the performance of a centrifugal compressor under dynamic load follow-up. The model is developed using Simulink
environment, and is composed of a compressor, throttle body, valves, and chamber. Greitzer's compressor model is used, and the geometric parameters are achieved by the actual supercharger. The simulation model is validated with experimental data. It is shown that compressor surge is effectively predicted by this dynamic compressor model under various operating conditions.
Induction Heating Device for Dental Implant Removal
Lee, Sang-Myung ; Seo, Young ; Song, Chang-Woo ; Lee, Seung-Yop ;
Transactions of the Korean Society of Mechanical Engineers B, volume 40, issue 5, 2016, Pages 305~311
DOI : 10.3795/KSME-B.2016.40.5.305
Induction heating is the process in which an electrically conducting object (usually a metal) is heated by electromagnetic induction through heat generated in the object by eddy currents. The main advantage of an induction heating device is the generation of the heat inside the target object itself. Hence, non-contact and safe heating devices are widely used in many industrial and medical fields. Recently, a new dental implant system was developed using a shape-memory alloy, wherein an artificial tooth could be easily removed from the dental implant by heating. This paper discusses the development of an induction-heating device to remove the dental crown in the new implant system. First, the finite element simulation of electromagnetic and thermal coupling analysis was implemented to obtain the temperature distributions of the target object for various frequencies, input currents, and coil shapes. Based on the simulation results, experiments were conducted by using prototypes, and an induction heating device was developed to remove the dental crown from the implant.
Numerical Study on Effects of Velocity Profile of Liquid Container on Sloshing
Kim, Dongjoo ;
Transactions of the Korean Society of Mechanical Engineers B, volume 40, issue 5, 2016, Pages 313~319
DOI : 10.3795/KSME-B.2016.40.5.313
It is very important to understand and control the sloshing in a liquid container that is partially filled with liquid. Previous studies focused primarily on the sloshing and resonance caused by sinusoidal excitations, while the present study focuses on understanding and suppressing sloshing in a container that moves rapidly from a given point to another in industrial applications. To achieve this, we first numerically predict the two-phase flow induced by the horizontal movement of a rectangular container. Then we analyze the effects of container-velocity profile (in particular acceleration/deceleration duration) on sloshing. Results show that sloshing is significantly suppressed when the acceleration/deceleration duration is a multiple of the 1st-mode natural period of sloshing.
Application of Airfoil Impeller for Enhancement of Aerodynamic Performance of High Speed Centrifugal Fan
Park, Kyung Hyun ; Park, Chang Hwan ;
Transactions of the Korean Society of Mechanical Engineers B, volume 40, issue 5, 2016, Pages 321~327
DOI : 10.3795/KSME-B.2016.40.5.321
This paper presents the application of airfoil impeller for enhancement of aerodynamic performance of a high speed centrifugal fan. Three airfoil impellers are proposed, considering the maximum thickness and the location of maximum thickness of the airfoil. C4 airfoil thickness distribution is applied to the three airfoil impellers. The impellers are evaluated using CFD (computational fluid dynamics) and suction power test. From the results, it is confirmed that flow separations on the pressure side of the impeller blades and the pressure side of diffuser blades are reduced when airfoil blade is applied to the impellers. It is also confirmed that with the centrifugal fan having airfoil impellers, there is an increase in fan efficiency by approximately 3% and reduction in specific sound level by approximately 1.3 dB(A).
Numerical Analysis of Flow Distribution Inside a Fuel Assembly with Split-Type Mixing Vanes
Lee, Gong Hee ; Cheong, Ae Ju ;
Transactions of the Korean Society of Mechanical Engineers B, volume 40, issue 5, 2016, Pages 329~337
DOI : 10.3795/KSME-B.2016.40.5.329
As a turbulence-enhancing device, a mixing vane, which is installed at a spacer grid of the fuel assembly, plays an important role in improving convective heat transfer by generating either swirl flow in the subchannels or cross flow between the fuel rod gaps. Therefore, both the geometric configuration and the arrangement pattern of a mixing vane are important factors in determining the performance of a mixing vane. In this study, in order to examine the flow-distribution features inside a
fuel assembly with split-type mixing vanes, which was used in the benchmark calculation of the OECD/NEA, we conduct simulations using the commercial computational fluid dynamics software, ANSYS CFX R.14. We compare the predicted results with measured data obtained from the MATiS-H (Measurement and Analysis of Turbulent Mixing in Subchannels-Horizontal) test facility. In addition, we discuss the effect of the split-type mixing vanes on the flow pattern inside the fuel assembly.
Study on the Natural Convection Heat-Transfer Enhancement in Radial Heat Sink Using the Perforation and Flow Guide
Jeon, Sora ; Li, Bin ; Byon, Chan ;
Transactions of the Korean Society of Mechanical Engineers B, volume 40, issue 5, 2016, Pages 339~345
DOI : 10.3795/KSME-B.2016.40.5.339
In this study, we numerically investigate the thermal performance of an enhanced radial heat sink with a perforation and chimney structure. We estimate the thermal performance of the enhanced radial heat sink, and compared it with that of a conventional radial heat sink. The results show that the radial heat sink with perforation has a higher thermal performance when either of the diameter and the number of perforations is high. With regards to the radial heat sink with a chimney structure, we investigate primarily the effect of the fin number, and the spacing between the chimney and the base plate on the thermal performance. The results show that there are optimal values for the fin number and the spacing between chimney and base plate. In addition, the enhanced radial heat sinks have maximum thermal performance when facing upward (
), while it has worst performance when facing sideward (
). The perforation and chimney are shown to cause thermal performance enhancements of 17% and 20%, respectively, compared with a conventional radial heat sink. The proposed method is useful for starting business, and is useful in terms of venture and entrepreneurship.