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한 쌍의 2차원 반무한 사각전극이 유전성 유체에 작용하는 전기유체역학적 힘
이대근(Dae Keun Lee),최경빈(Kyong Bin Choi),동상근(Sang-Keun Dong),고창복(Chang-Bok Ko),정정열(Jung-Yeul Jung) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
When a couple of 2-dimensional, semi-infinite and rectangular electrodes is placed in a dielectric fluid and voltages applied to them are different, the electrohydrodynamic force acting on a dielectric fluid is analytically obtained. Since the physical domain is symmetric on the centerline and the applied potentials are anti-symmetric based on the mean value, the analysis on the half physical domain suffices for our purpose. The half domain can be conformally transformed to the infinite strip, where the Laplace equation on the electrical potential can be easily solved. When the results are applied to a micropump design, it can provide the body-force field and the hydrostatic pressure difference and help the optimal design of electrodes.
정정열(Jung-Yeul Jung),오후석(Hoo-Suk Oh),곽호영(Ho-Young Kwak),최경빈(Kyong-Bin Choi),고창복(Chang-Bok Ko) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Convective heat transfers of a nanofluid in rectangular microchannel were measured. An integrated microsystem consisting of a single microchannel on one side and two localized heaters and seven polysilicon temperature sensors along the channel on the other side were fabricated. Aluminum dioxide (Al₂O₃) suspended nanofluids with various particle volume fractions were used in experiment to investigate the effect of the volume fraction of the nanoparticles to the convective heat transfer and fluid flow in microchannels. The convective heat transfer coefficient with Al₂O₃ suspended nanofluid was measured to be increased up to 30 % compared to the distilled water at a volume fraction of 1.8 vol.% without major friction loss. A new type of convective heat transfer correlation was proposed to correlate experimental data of heat transfer for nanofluids in microchannels.
일차 산소 직접 분사형 다중 노즐 미분탄 순산소 스월 연소기의 성능시험
이대근(Dae Keun Lee),노동순(Dong-Soon Noh),서동명(Dong Myung Seo),고창복(Chang-Bog Ko),이은경(Eun Kyung Lee),최경빈(Kyong-Bin Choi) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The development of Oxy-PC(pulverized coal) burner and its preliminary test were performed. The design concepts of the burner were the adoptions of primary-oxygen direct-injection without the dilution with the recycled flue gas and through multi-nozzle for fuel-oxidant mixing and stable burning, and of high intensity swirler to coping with the reduction of swirling momentum due to a reduced gas flow rate of Oxy-PC combustion compared with Air-PC case. The exhaust gas analyses were conducted for a variety of experimental conditions of O₂ concentration, swirl number, primary O₂ flow rate and tertiary oxidant flow rate. The representative results are the achievement of high concentration CO₂ over 95% and the reduction of NO<SUB>x</SUB> emission to 48㎎/MJ by the injection of tertiary O₂/CO₂ mixture.
0.1㎿급 동축 연소기를 이용한 미분탄의 산소연소 특성 연구
이대근(Dae Keun Lee),노동순(Dong-Soon Noh),김승곤(Seung Gon Kim),고창복(Chang-Bog Ko),서동명(Dong Myung Seo),최경빈(Kyong-Bin Choi) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
Experiments using 0.1㎿-class coaxial combustor were conducted to elucidate the fundamental characteristics of pulverized coal combustion with O₂/CO₂ mixture as oxidizer stream, simulating the Oxy-PC combustion with FGR. For various experimental conditions(coal type, thermal power, now rate and swirl now), measurements of in-furnace temperature and radiative heat flux along the furnace and exhaust gas analysis were conducted. As a result, it was found that coal types and O₂ concentration in supplying oxidant have significant effects on flame temperature. Besides, the radiative heat flux of Oxy-PC case, showing a similar temperature profile with Air-PC case, is 21~61% larger than its counterpart. From the exhaust gas analyses, it is thought that CO₂ concentration higher than 90% in Oxy-PC case can be easily achieved by a well-controlled O₂ amount but the combustor design and the determination of operating conditions are important and necessary to reduce the NOx emission.