http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
쉴리렌 간섭계에 의한 사각덕트내 후향계단후 유동에서의 혼합대류 전열에 관한 연구
백병준,박복춘,김진택,Baek, B.J.,Pak, B.C.,Kim, J.T. 대한설비공학회 1994 설비공학 논문집 Vol.6 No.1
The flow and heat transfer characteristics behind a backward facing step located in a vertical channel has been studied. In this study, the numerical prediction has been performed by solving the Navier-Stokes equation and energy equation simultaneously with the SIMPLE algorithm embedied in TEACH code. Local heat flux was measured by using Schlieren Interferometer. The flow visualization was performed using the cylindrical lens and the laser beam that is scattered by the supplied glycerine particles. The velocity and temperature distributions, recirculation region, reattachment length, and local heat flux are obtained under the various parameters to investigate the buoyancy effect on the flow and heat transfer characteristics behind the step.
엇갈림 관군에서 원관 주위의 열전달에 미치는 파울링 영향에 관한 실험적 연구
김민수,백병준,박복춘,Kim, Min-Su,Baek, Byeong-Jun,Park, Bok-Chun 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.11
An experimental study has been performed to investigated the forced convection heat transfer characteristics of 6 circular cylinders in staggered arrangement in a cross flow of air. The water scale deposited on condenser wall of power plant was used to investigate the effect of roughness of scaled surfaces. The relative roughness*average diameter of scale/cylinder diameter) was in a range of k/d=0.0066, 0.0111, 0.0167, 0.0222 and 0.0278. The cylinder spacings(L/d) varies from 1.5 to 4.0 where L denote the cylinder spacings along and normal to the upstream uniform flow direction. The Reynolds number was varied in a range of 10, 000$\leq$ Re $\leq$ 50,000. The local and mean Nusselt numbers were investigated as a function of scale roughness, the cylinder spacing and Reynolds number. The results are compared with those of clean cylinder and inline tube bank, subsequently the mean fouling resistance over the entire circumference was estimated from those results as a function of scale roughness, the cylinder spacing and Reynolds number.
김의광,백병준,조병수,Kim, Ui-Gwang,Baek, Byeong-Jun,Jo, Byeong-Su 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.2
The coupled conduction and convection heat transfer from the protruding heat source in a vertical channel is numerically investigated. Conjugate solution of the two-dimensional energy equation is obtained for the incompressible air flow over the rectangular block with local heat source. It was found that several recirculation zones and separation bubble near the block were related to Re and Gr. And the results show that fractions of the heat transfer through each of the block face, maximum temperature of the block and the relative effect of each parameter on the maximum temperature and heat transfer.
수평 및 수직형 CVD 증착로의 실리콘 부착에 관한 수치해석
김인,백병준,Kim, In,Baek, Byung-Joon 대한기계학회 2002 大韓機械學會論文集B Vol.26 No.3
The fluid flow, heat transfer and the local mass fraction of chemical species in the chemical vapor deposition(CVD) manufacturing process are studied numerically. Flow with a dilute precursor concentration of silane in hydrogen as the carrier gas enters to the reactor and deposits silicon onto the heated surface. The silicon deposition rate using silane is calculated in the horizontal or vertical, axisymmetric reactor. The effects of inlet carrier gas velocity, mass fraction of silane, susceptor angle and rotation of surface on the deposition rate are described.
Real Time Temperature Distribution Measurement of a Microheater by Using Off-Axis Digital Holography
체랭돌가르,백병준,김대석,Tserendolgor, D.,Baek, Byung-Joon,Kim, Dae-Suk The Korean Vacuum Society 2011 Applied Science and Convergence Technology Vol.20 No.2
We describe a single shot off-axis digital holography based on a Mach-Zehnder interferometic scheme for measuring temperature distribution of a microheater. The proposed scheme has the capability of reconstructing object phase image which is dependent of the temperature distribution in real time. Experimental results shows that there is a moderate linear relationship between the measured phase and temperature in the range of $20^{\circ}C$ to $60^{\circ}C$. We expect that the proposed system can provide a very reliable and fast solution in various surface temperature distribution measurement applications. 본 논문은 마이크로히터표면의 실시간 온도분표측정을 위한 마하젠더 간섭계 기반의 off-axis 디지털홀로그래피기술에 대한 것이다. 제안된 방법은 재료표면의 온도분포에 직접적인 함수인 2차원 위상 분포를 측정하고, 이를 통해 실시간으로 재료표면의 온도 map을 측정할 수 있다. 본 논문에서는 섭씨 20도에서 60도 사이의 온도구간에서 마이크로히터 표면의 위상변화와 실제표면온도가 선형적인 관계가 있음을 실험적으로 보였다. 제안된 방법은 재료표면의 온도분포를 실시간으로 측정하고자 하는 다양한 응용분야에 적용될 수 있을 것으로 기대된다.
노즐특성에 따른 MIST-COOLING 열전달에 관한 실험적 연구
이진원,강영규,백병준,박복춘 ( J . W . Lee,Y . G . Kang,B . J . Baek,B . C . Park ) 한국열처리공학회 1992 熱處理工學會誌 Vol.5 No.3
The effect of nozzle characterristics on the mist-cooling heat transfer was investigated under the various flow conditions. Two different types of twin fluid nozzle were used, one is a 90° angle tip nozzle with needle and the other is a 90° angle tip non-needle nozzle. The cooling rate from the heated surface was measured and obtained the boiling curve as a function of surface temperature. An immersion sampling was employed for the measurement of droplet size of the spray. As a result of this experiment, the liquid sheet type nozzle shows better atomization when the mass ratio Mr>2.0, and collects more liquid droplets on the heated surface that results in better cooling effect. It was found that the maximum heat flux and heat transfer coefficient increased with increase in the volumetric flow rate, whereas the maximum heat flux decreased with increase in spray distance. The cooling effect depends upon the amount of collected droplet and droplet size, but it strongly depends upon the amount of collected droplet.
전우청,조병수,백병준,박복춘,Jeon, U-Cheong,Jo, Byeong-Su,Baek, Byeong-Jun,Park, Bok-Chun 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.4
Differential pressure devices such as an orifice and Venturi are widely used in the measurement of flow rate of fluid mainly due to cost effectiveness and easy installation. In the current study, the viscoelastic effect on discharge and loss coefficients of those flow meters were investigated experimentally. Aqueous solutions of Polyacrylamide (200, 500, and 800 ppm) as viscoelastic fluids were used. Discharge coefficient of an orifice for viscoelastic fluids increased significantly up to approximately 15-20% when compared with that for water, while loss coefficient decreased up to 10-25% depending on the diameter ratio, .betha.. Also, pressure recovery for viscoelastic fluids was extended much longer than that for water. On the other hand, discharge and loss coefficients of Venturi for viscoelastic fluids were found to be strongly dependent on the Reynolds number. In both flow meters, the concentration effect for discharge and loss coefficients was not observed at more over than 200 ppm of aqueous solution. Conclusively, orifice and Venturi flow meters should be calibrated very carefully in the flow rate measurement for viscoelastic fluids.
고품질 질화물 반도체 박막 성장을 위한 반응로 구조 및 열적 조건에 관한 연구
김진택(Jin Taek Kim),백병준(Byung Joon Baek),박복춘(Bock Choon Pak),Cheul Ro Lee 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.10
Numerical calculation has been performed to investigate the transport phenomena in the horizontal reactor which has two different gas inlets for MOCVD(metalorganic chemical vapor deposition). The full elliptic governing equations for continuity, momentum, energy and chemical species are solved by using the commercial code FLUENT. It is investigated how thermal characteristics, reactor geometry, and the operating parameters affect flow fields, mass fraction of each reactants. The numerical simulations demonstrate that flow rate of each species, inlet geometry of the reactor, and its distance from the susceptor as well as the inclination of upper wall of reactor can be used effectively to optimize reactor performance. The commonly used idealized boundary conditions are also investigated to predict flow phenomena in the actual deposition system.