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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 36, Issue 12 - Dec 2012
Volume 36, Issue 11 - Nov 2012
Volume 36, Issue 10 - Oct 2012
Volume 36, Issue 9 - Sep 2012
Volume 36, Issue 8 - Aug 2012
Volume 36, Issue 7 - Jul 2012
Volume 36, Issue 6 - Jun 2012
Volume 36, Issue 5 - May 2012
Volume 36, Issue 4 - Apr 2012
Volume 36, Issue 3 - Mar 2012
Volume 36, Issue 2 - Feb 2012
Volume 36, Issue 1 - Jan 2012
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Numerical Study of Heat and Mass Transfer Characteristics in Microchannel Steam Methane Reforming Reactor
Jeon, Seung-Won ; Lee, Kyu-Jung ; Cho, Yeon-Hwa ; Moon, Dong-Ju ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 885~894
DOI : 10.3795/KSME-B.2012.36.9.885
A numerical study of a microchannel steam methane reforming reactor has been performed to understand the characteristics of heat and mass transfer. The integration of Rh-catalyzed steam methane reforming and Pt-catalyzed methane combustion has been simulated. The reaction rates for chemical reactions have been incorporated into the simulation. This study investigated the effect of contact time, flow pattern (parallel or counter), and channel size on the reforming performance and temperature distribution. The parallel and counter flow have opposite temperature distribution, and they show a different type of reaction rate and species mole fraction. As the contact time decreases and channel size increases, mass transfer between the catalyst layer and the flow is limited, and the reforming performance is decreased.
Evaluation of Dispersion Stability and Absorption Performance Enhancement of Binary Nanoemulsion Fluids
Lee, Jin-Ki ; Kim, Young-Jin ; Shin, Myung-Chul ; Kim, Se-Won ; Kang, Yong-Tae ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 895~900
DOI : 10.3795/KSME-B.2012.36.9.895
This paper aims to examine the effect of nanodroplets on pool-type absorption heat transfer enhancement and to find the relationship between the dispersion stability and the absorption performance. The concentrations of oil and surfactant are considered as the key parameters.
and Tween20 are used as the surfactants and N-decane oil is added to the
solution to make the binary nanoemulsion fluids. Binary nanoemulsion fluids are dispersed by the ultrasonic vibrator and the stirrer under specific conditions. The dispersion stability of binary nanoemulsion fluids for each oil concentrations is evaluated from the droplet size and Tyndall effect analysis. The absorption performance of binary nanoemulsion fluids is compared with the result of dispersion stability. In addition, it is found that the binary nanoemulsion fluid is a strong candidate as a new working fluid for absorption applications.
Electroporation and Viability Monitoring Chip for Lung Cancer Cells in Single Channel with Multiple Electric Field Zones
Kim, Min-Ji ; Kim, Tae-Yoon ; Cho, Young-Ho ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 901~905
DOI : 10.3795/KSME-B.2012.36.9.901
We present an electroporation and viability monitoring chip for lung cancer cells in a single channel with multiple electric field zones. Previous electroporation chips utilized multiple microchannels or electrodes to form multiple electric fields, thus resulting in complex structures. However, the present chip can generate multiple electric fields in a single stepwise microchannel between a pair of electrodes, thus achieving the analysis of both cell electroporation and viability with a simple structure. We demonstrate that the electric field of 0.4 kV/cm results in a maximum percentage of
of viable and electroporated human lung cancer cells, H23 and A549, respectively. The present chip has potential for use in integrated cell chips for transfection studies.
High-Order Perturbation Solutions of Liquid Pool Spreading with Continuous Spill
Kim, Myung-Bae ; Do, Kyu-Hyung ; Han, Yong-Shik ; Choi, Byung-Il ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 907~913
DOI : 10.3795/KSME-B.2012.36.9.907
High-order perturbation solutions have been obtained for the simple physical model describing the liquid pool spreading with a continuous spill, and these are shown to improve over first-order perturbation solutions. The non-dimensional governing equations for the model are derived to obtain more general solutions. Non-dimensional parameters are sought as the governing parameters for the non-dimensional equations, and the non-dimensional evaporation rate is used as the perturbation parameter. The results show that the high-order solutions exhibit an improvement over the first-order solutions with respect to the pool volume as well as the spreading radius. In addition, as the order of the perturbation solutions increases, the difference between the numerical solutions and the perturbation solutions is significantly reduced. Finally, it is revealed that the third-order solutions are reasonable because they almost agree with the numerical solutions.
Development of IMEP Estimation and Control Algorithm Using In-Cylinder Difference Pressure for Passenger Diesel Engines
Chung, Jae-Sung ; Oh, Seung-Suk ; Park, In-Seok ; SunWoo, Myoung-Ho ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 915~921
DOI : 10.3795/KSME-B.2012.36.9.915
In this study, we propose a new method for estimating the IMEP using difference pressure, which is the pressure difference between the cylinder pressure and the motoring pressure. The estimated IMEP, denoted as
, optimizes the theoretical IMEP calculation range based on the fact that the difference pressure exists between the start and the end of combustion.
is verified to have a high linear correlation with IMEP with
of 0.9955. The proposed method can estimate the IMEP with 21% of the cylinder pressure data and 31% of the calculation effort compared to the theoretical IMEP calculation method, and therefore, it has great potential for real-time implementations. The estimation and control performance of
is validated by engine experiments, and by controlling
, the torque variation between the cylinders was reduced.
Effects of Prandtl Numbers on Heat Transfer of Backward-Facing Step Laminar Flow with a Pulsating Inlet
Kim, Won-Hyun ; Park, Tae-Seon ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 923~930
DOI : 10.3795/KSME-B.2012.36.9.923
The wall heat transfer of backward-facing step laminar flows with different Prandtl numbers and a pulsating inlet is investigated by unsteady simulations. The inlet is perturbed by the variation of frequency and amplitude. Temperature-dependent transport properties are adopted. Various characteristics of the wall heat transfer are explained by the variation of the thermal boundary layer. For Pr < 1, the wall heat transfer of temperature-dependent properties is decreased compared to that of constant properties, whereas it increases for Pr < 1. In addition, the wall heat transfer increases depending on the pulsating amplitude. However, the results of frequency variation for St < 0.2 show that the heat transfer is strongly enhanced at a specific frequency. In particular, the increase in the wall heat transfer is strongly related to the root mean square of the fluctuations of the reattachment length.
Study on Low-Temperature Solid Oxide Fuel Cells Using Y-Doped BaZrO
Chang, Ik-Whang ; Ji, Sang-Hoon ; Paek, Jun-Yeol ; Lee, Yoon-Ho ; Park, Tae-Hyun ; Cha, Suk-Won ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 931~935
DOI : 10.3795/KSME-B.2012.36.9.931
In this study, we fabricate and investigate low-temperature solid oxide fuel cells with a ceramic substrate/porous metal/ceramic/porous metal structure. To realize low-temperature operation in solid oxide fuel cells, the membrane should be fabricated to have a thickness of the order of a few hundreds nanometers to minimize IR loss. Yttrium-doped barium zirconate (BYZ), a proton conductor, was used as the electrolyte. We deposited a 350-nm-thick Pt (anode) layer on a porous substrate by sputter deposition. We also deposited a 1-
-thick BYZ layer on the Pt anode using pulsed laser deposition (PLD). Finally, we deposited a 200-nm-thick Pt (cathode) layer on the BYZ electrolyte by sputter deposition. The open circuit voltage (OCV) is 0.806 V, and the maximum power density is 11.9 mW/
. Even though a fully dense electrolyte is deposited via PLD, a cross-sectional transmission electron microscopy (TEM) image reveals many voids and defects.
Thermodynamic Analysis of Trilateral Cycle Applied to Exhaust Gas of Marine Diesel Engine
Choi, Byung-Chul ; Kim, Young-Min ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 937~944
DOI : 10.3795/KSME-B.2012.36.9.937
The thermodynamic characteristics of a trilateral cycle with water as a working fluid have been theoretically investigated for an electric generation system to recover the waste heat of the exhaust gas from a diesel engine used for the propulsion of a large ship. As a result, when a heat source was given, the efficiencies of energy and exergy were maximized by the specific conditions of the pressure and mass flow rate for the working fluid at the turbine(expander) inlet. In this case, as the condensation temperature increased, the volume expansion ratio of the turbine could be reduced properly; however, the exergy loss of the heat source and exergy destruction of the condenser increased. Therefore, in order to recover the waste exergy from the topping cycle, the combined cycle with a bottoming cycle such as an organic Rankine cycle, which is utilized at relatively low temperatures, was found to be useful.
Combustion Characteristics of MDO and MDO Emulsion in Automotive Diesel Engine
Park, Jin-Kyu ; Oh, Jung-Mo ; Kim, Hyung-Ik ; Lee, Chang-Hee ; Lee, Ki-Hyung ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 945~951
DOI : 10.3795/KSME-B.2012.36.9.945
A water emulsion fuel can be used to reduce soot and NOx emissions simultaneously because it has a lower combustion temperature and better fuel atomization owing to the evaporative latent heat and microexplosion of water. Moreover, it can be used without making special modifications to conventional diesel engines. Therefore, this fuel has attracted considerable research attention. In addition, lower-grade fuels are being considered for use in conventional engines because of an increase in oil prices. In this study, we investigated the combustion and exhaust characteristics of MDO (marine diesel oil), which has a lower grade than common diesel oil, and ME (MDO water emulsion) under various test conditions in an automotive diesel engine.
Analysis of Pressure Drop and Heat Loss in Liquid Sodium Circulation Wick of AMTEC
Lee, Ki-Woo ; Lee, Wook-Hyun ; Rhi, Seok-Ho ; Lee, Kye-Bock ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 953~960
DOI : 10.3795/KSME-B.2012.36.9.953
An AMTEC (alkali metal thermal electric converter) is a device that is used for the direct conversion of heat to electricity. Sodium is used as the working fluid, and its circulation is driven by a capillary wick. The wicks used for circulation include an evaporator wick, artery wick, and condenser wick, and each wick has a pressure drop because of the circulation of liquid and vapor. For the circulation of sodium, the capillary pressure of the evaporator wick must be greater than the total pressure drop in the wicks. In this study, the pressure drop in the evaporator wick, artery wick, and condenser wick and the heat loss from the evaporator to the condenser through the artery wick were analyzed for the design of a 100 W AMTEC prototype. It was found that a particle diameter of 10
is suitable for the evaporator wick to maintain a capillary pressure greater than total pressure drop in the circulation loop.
Sensing System for Measuring Deflection of Microcantilever
Kim, Hyun-Chul ; Lee, Sang-Heon ;
Transactions of the Korean Society of Mechanical Engineers B, volume 36, issue 9, 2012, Pages 961~964
DOI : 10.3795/KSME-B.2012.36.9.961
This paper presents a sensing system to measure the deflection of a microcantilever in an atomic force microscope. In general, the optical lever method and interferometry are used for the sensing system; however, their size and cost leaves considerable room for improvement. Therefore, we used an optical pickup head whose operating principle is based on the astigmatism of the commercial optical disk drives. The developed sensing system was applied to a laboratory atomic force microscope, and satisfactory results were obtained.