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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 27, Issue 12 - Dec 2003
Volume 27, Issue 11 - Nov 2003
Volume 27, Issue 10 - Oct 2003
Volume 27, Issue 9 - Sep 2003
Volume 27, Issue 8 - Aug 2003
Volume 27, Issue 7 - Jul 2003
Volume 27, Issue 6 - Jun 2003
Volume 27, Issue 5 - May 2003
Volume 27, Issue 4 - Apr 2003
Volume 27, Issue 3 - Mar 2003
Volume 27, Issue 2 - Feb 2003
Volume 27, Issue 1 - Jan 2003
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Experimental Study of Thermal Performance of Heat Pipe with Axial Trapezoidal Grooves
Suh, Jeong-Se ; Lee, Woon ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 407~414
DOI : 10.3795/KSME-B.2003.27.4.407
Analysis and experiment are performed to investigate the thermal performance of a heat pipe with axial grooves. The heat pipe was designed in a 6.5 mm I.D., 17 axial trapezoidal grooves. 1000 mm long tube of aluminium, and ammonia as working fluid. A mathematical equations fur heat pipe with axial grooves is formulated to obtain the capillary limitation on heat transport rate in a steady state. As a result, heat transport factor of heat pipe has the maximum at the operating temperature of 293K in 0m elevation. As the elevation of heat pipe increases. the heat transport factor of the heat pipe is reduced markedly, comparing with that of horizontal elevation of the heat pipe. It may be considered that such behavior of heat pipe is caused by the working fluid swarmed back to the condenser port due to gravity force and supercooled by a coolant of heat exchanger. Analytical results of heat transport factor are in a good agreement with those of experiment.
Numerical Instability Analysis of the Rotating Boundary-Layer flow Including Pre-Swirl
Hwang, Young-Kyu ; Lee, Yun-Yong ; Lee, Kwang-Won ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 415~423
DOI : 10.3795/KSME-B.2003.27.4.415
The hydrodynamic instability of the three-dimensional boundary-layer over a rotating disk has been numerically investigated for these flows; Ro
Evaporation Cooling of a Droplet containing a Surfactant
Riu, Kap-Jong ; Bang, Chang-Hoon ; Kim, Hyun-Woo ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 424~431
DOI : 10.3795/KSME-B.2003.27.4.424
The evaporation cooling phenomenon of a droplet containing a surfactant on a heated surface has been studied experimentally. The two kinds of heater modules made of brass and Teflon
were tested to investigate the cooling characteristics of droplet. Solutions of water containing Sodium Lauryl Sulfate(0 ppm, 100 ppm, 1000 ppm) were tested in the experiments. The results showed that the contact angle decrease as the concentration of surfactant increases. The tendency did not very with different heated solid materials. As initial temperature of the heated surface becomes high, time averaged heat flux increases and evaporation time decreases with the denser concentration of surfactant. Therefore, water with denser concentration of surfactant could be effective to cool flammable materials. However, the effect of surfactant becomes low as the material temperature is higher than the boiling temperature of water.
A Study on the Hydraulic System Circuit Analysis and Modeling of the Hydrostatic Tire Roller
Kim, Sang-Gyum ; Park, Chun-Shic ; Kim, Jung-Ha ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 432~439
DOI : 10.3795/KSME-B.2003.27.4.432
In this research, we are trying to develop the new hydraulic driven tire roller which is conventionally operated by mechanical transmission system. The reason why we would like to develop it is that tire roller is one of the most useful machine for the road construction site and also imported totally from overseas. In this paper, we conceptualize the new hydraulic system and derive the equations of motion for dynamic analysis. And we investigate system modeling by using DAQ system. Finally, we will design the controller, which can manage the hydraulic circuit of steering and traction mechanism system. The advent of modern high-speed computers coupled with the application of high-fidelity simulation technology can be used to create “virtual prototypes of construction equipment. Tests conducted on these virtual prototypes may be used to augment actual machine testing, thereby lowering costs and shortening time to production. So, we studied tire roller to integrate development technology. In System Analysis, We formulate hydraulic driving system model and hydraulic steering system model. Also, We integrate DAQ system to acquire experimental result in real tire roller equipment.
Acoustic Response of Hydrogen/Liquid Oxygen Flame in Stagnation-Point Flow
Park, Sung-Woo ; Chung, Suk-Ho ; Kim, Hong-Jip ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 440~446
DOI : 10.3795/KSME-B.2003.27.4.440
Steady-state structure and acoustic pressure responses of GH
-LOx diffusion flames in stagnation-point flow configuration have been studied numerically with a detailed chemistry to investigate the acoustic instabilities. The Rayleigh criterion is adopted to judge the instability of the GH
-LOx flames from amplification and attenuation responses at various acoustic pressure oscillation conditions for near-equilibrium to near-extinction regimes. Steady state flame structure showed that the chain branching zone is embedded in surrounding two recombination zones. The acoustic responses of GH
-LOx flame showed that the responses in near-extinction regime always have amplification effect regardless of realistic acoustic frequency. That is, GH
-LOx flame near-extinction is much sensitive to pressure perturbation because of the strong effect of a finite-chemistry.
The Characteristics of the Flow and Combustion in a Turbulent Non-Premixed Flat Flame
Kwark, Ji-Hyun ; Jung, Yong-Ki ; Jun, Chung-Hwan ; Chang, Young-June ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 447~457
DOI : 10.3795/KSME-B.2003.27.4.447
An experiment in a turbulent non-premixed flat flame was carried out in order to investigate the effect of swirl number on the flow and combustion characteristics. First. stream lines and velocity distribution in the flow field were obtained using PIV method. In contrast with the axial flow without swirl, highly swirled air induced stream lines along the burner tile. and backward flow was caused by recirculation in the center zone of the flow field. In the combustion. the flame with swirled air also became flat and stable along the burner tile with increment of the swirl number. Flame structure by measuring OH and CH radicals intensity and by calculating Damkohler number(Da) and turbulence Reynolds number(Re
) was examined. It appeared to be comprised in the wrinkled laminar-flame regime. Backward flow by recirculation of the burned gas decreased the flame temperature and emissions concentrations as NO and CO. Consequently, the stable flat flame with low NO concentration was achieved.d.
Finite Element Analysis of Incompressible Transient Navier-Stokes Equation using Fractional-Step Methods
Kim, Hyung-Min ; Lee, Shin-Pyo ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 458~465
DOI : 10.3795/KSME-B.2003.27.4.458
The main objective of the research is to develop a research code solving transient incompressible Navier-Stokes equation. In this research code, Adams-Bashforth method was applied to the convective terms of the navier stokes equation and the splitted equations were discretized spatially by finite element methods to solve the complex geometry problems easily. To reduce the divergence on the boundaries of pressure poisson equation due to the unsuitable pressure boundary conditions, multi step approximation pressure boundary conditions derived from the boundary linear momentum equations were used. Simulations of Lid Driven Flow and Flow over Cylinder were conducted to prove the accuracy by means of the comparison with results of the previous workers.
The Role of Slits and Swirl Vanes on the Turbulent Flow Fields in Gun-Type Gas Burner with a Cone-Type Baffle Plate
Kim, Jang-Kweon ; Jeong, Kyu-Jo ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 466~475
DOI : 10.3795/KSME-B.2003.27.4.466
The gun-type gas burner adopted in this study is generally composed of eight slits and swirl vanes. Thus, this paper is studied to investigate the effect of slits and swirl vanes on the turbulent flow fields in the horizontal plane of gas swirl burner with a cone type baffle plate measured by using X-probe from hot-wire anemometer system. This experiment is carried out at flow rate 450
/min in the test section of subsonic wind tunnel. The axial mean velocity component in the case of burner model with only swirl vanes shows the characteristic that spreads more remarkably toward the radial direction than axial one, it does, however, directly opposite tendency in the case of burner model with only slits. Consequently. both slits and swirl vanes composing of gun-type gas burner play an important role in decrease of the speed near slits and increase of the flow speed in the central part of a burner because the biggest speed spurted from slits encircles rotational flow by swirl vanes and it drives main flow toward the axial direction. Moreover, the turbulent intensities and turbulent kinetic energy of gun-type gas burner are distributed with a fairly bigger size within X/R<0.6410 than burner models which have only slits or swirl vanes because the rotational flow by swirl vanes and the fast jet flow by slits increase flow mixing, diffusion, and mean velocity gradient effectively.
Flow and Heat Transfer Characteristics of the Evaporating Extended Meniscus in a Micro Parallel Plate
Park, Kyong-Woo ; Noh, Kwan-Joong ; Lee, Kwan-Soo ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 476~483
DOI : 10.3795/KSME-B.2003.27.4.476
A mathematical model is presented to predict the two-phase flow and heat transfer phenomena of the evaporating extended meniscus region in a micro-channel. The pressure difference at the liquid-vapor interface can be obtained by the augmented Laplace-Young equation. The correlative equations for film thickness, pressure, and velocity in the meniscus region are derived by applying the mass, momentum, and energy equations into the control volume. The results show that increasing the heat flux and the liquid inlet velocity cause the length and liquid film thickness of the extended meniscus region to decrease. The variation, however, of the heat flux and liquid inlet velocity has no effect on the profile of film thickness. The majority of heat is transferred through the thin film region that is a very small region in the extended meniscus region. It is also found that the vapor velocity increases gradually in the meniscus region. However, it increases sharply at the junction of the meniscus and thin film regions.
The Flow Characteristics of Fuel Droplets between the Twin Spray for 4-hole Gasoline Injectors
Kim, Won-Tae ; Kang, Shin-Jae ; Rho, Byung-Joon ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 484~495
DOI : 10.3795/KSME-B.2003.27.4.484
This study investigates the flow characteristics of fuel droplets between twin spray for the 4-hole injector used a 4-valve gasoline engine. The injectors for this study were the three types of 4-hole gasoline injector in which orifice diameter was 0.24mm. The spray behavior of twin spray was investigated by means of visualization employed stroboscope. A PDPA system was employed to simultaneously measure the size and velocity of fuel droplets. The 3 dimensional mean velocities. droplet size distributions, SMD and joint probability density function of velocity and droplet size are analyzed at the center of the spray and the center region of twin spray. As a result, the configurations of injector exit such as orifice interval and length of outlet, are very important factors that affect the flow characteristics of fuel droplets at the center region of twin spray.
Thermal Transport from an Aluminum Foam Heat Sink in a Confined Impinging Air Jet
Hwang, Jun ; Kim, Seo-Young ; Kang, Byung-Ha ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 496~503
DOI : 10.3795/KSME-B.2003.27.4.496
An experimental study has been performed on thermal transport from an aluminum foam heat sink under a confined impinging air jet. Three kinds of aluminum foam heat sinks with 10, 20 and 40 PPI and a conventional pin-fin heat sink are tested in the present study. The jet Reynolds number is varied in the range of Re
Simultaneous Measurement of Velocity and Concentration Field in a Stirred Mixer Using PIV/LIF Technique
Jeong, Eun-Ho ; Yoon, Sang-Youl ; Kim, Kyung-Chun ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 504~510
DOI : 10.3795/KSME-B.2003.27.4.504
Simultaneous measurements of turbulent velocity and concentration field in a stirred mixer tank are carried out by using PIV/LIF technique. Instantaneous velocity fields are measured with a 1K
1K CCD camera adopting the frame straddle method while the concentration fields are obtained by measuring the fluorescence intensity of Rhodamine B tracer excited by the second pulse of Nd:Yag laser light. Image distortion due to the camera view-angle is compensated by a mapping function. It is found that the general features of the mixing pattern are quite dependent on the local flow characteristics during the rapid decay of mean concentration. However, the small scale mixing seems to be independent on the local turbulent velocity fluctuation.
An Experimental Study on Cooling Characteristics of Mist Impinging Jet on a Flat Plate
Jun, Snag-Uk ; Jung, Won-Seok ; Lee, Joon-Sik ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 511~517
DOI : 10.3795/KSME-B.2003.27.4.511
An experiment is conducted to investigate the effect of air and water mass flow rates on cooling characteristics of mist impinging jet on a flat plate. The air mass flow rate ranges from 0.0 to 3.0 g/s, and water mass flow rates from 5.0 to 20.0 g/s. An air-atomizing nozzle is used fur the purpose of controlling air and water mass flow rates. The test section is designed distinctively from previous works to obtain local heat transfer coefficient distributions. Heat transfer characteristics of the mist impinging jet are explained with the aid of flow visualization. Surface temperature and heat transfer coefficient distributions become more uniform as air mass flow rate increases. The water flow rate provides substantial contribution to enhancement of cooling performance. On the other hand, The air mass flow rate weakly influences the averaged heat transfer rate when the water mass flow rate is low, but the averaged heat transfer rate Increases remarkably with the air mass flow rate in case of the high water mass flow rate.
PIV Measurement on Airflows in the Abnormal Nasal Cavity with the Adenoid Vegetation
Kim, Sung-Kyun ; Son, Young-Rak ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 518~523
DOI : 10.3795/KSME-B.2003.27.4.518
Airflow in the nasal cavity of Korean adults is investigated experimentally by PIV measurement. Quantitative data for normal and abnormal nasal cavities with adenoid vegetation are obtained. The CBC PIV algorithm with window offset is used for PIV flow analysis. Average and RMS distributions are obtained for inspirational and expirational nasal airflows. Comparisons between western and Korean nasal airflows are appreciated. Due to the difference in geometry of the frontal part of nasal cavity, the flow near nares shows the difference. For the joint research on nasal deceases, PIV measurements of nasal airflow for nasal cavities with 50% and 70% adenoid vegetation are conducted for the first time. Comparisons in nasal airflows for both normal and abnormal cases are also appreciated.
Nano Particle Precipitation and Residual Ozone Decomposition of a Hybrid Air Cleaning System Comprising Dielectric Barrier Discharge Plasma and MnO
Catalyst or Activated Carbon
Byeon, Jeong-Hoon ; Hwang, Jung-Ho ; Ji, Jun-Ho ; Kang, Suk-Hoon ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 524~533
DOI : 10.3795/KSME-B.2003.27.4.524
DBD(Dielectric Barrier Discharge) plasma in air is well established for the production of large quantities of ozone and is more recently being applied to aftertreatment processes for HAPs(Hazardous Air Pollutants). Aim of this work is to determine design and operating parameters of a hybrid air cleaning system. DBD and ESP(Electrostatic Precipitator) are used as nano particle charger and collector, respectively. Pelletized MnO
catalyst or activated carbon is used fer ozone decomposition or adsorption material. AC voltage of 7～10 KV(rms) and 60 Hz is used as DBD plasma source. DC - 8 KV is applied to the ESP for particle collection. The overall particle collection efficiency for the hybrid system is over 85 % under 0.64 m/s face velocity. Ozone decomposition efficiency with pelletized MnO
catalyst or activated carbon packed bed is over 90 % when the face velocity is under 0.4 m/s in dry air.
A Study on Combustion Characteristics in a Low-Pollutant Municipal Waste Incinerator - Development and Validation of a Multi-Block Simulation Code -
Sohn, Young-Min ; Kim, Man-young ; Baek, Seung-Wook ;
Transactions of the Korean Society of Mechanical Engineers B, volume 27, issue 4, 2003, Pages 534~541
DOI : 10.3795/KSME-B.2003.27.4.534
To investigate the combustion characteristics in a low-pollutant municipal waste incinerator, the generalized multi-block simulation code that can be applied to turbulent reacting flow with gaseous hydrocarbon fuel in a 3D complex geometry has been developed with nongray radiation effects. To deal with the complex geometry, structured multi-block method and the scheme which treats interfaces implicitly are adopted. The developed code is validated through various engineering problems such as curved duct flow, driven cavity flow, gray multi-block radiation, nongray radiation. and combustion in a incinerator.