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저융점합금 필러를 이용한 이방성 도전성 접착제의 자기조직화 접속 특성에 관한 수치해석 연구
이진운(Jin Woon Lee),이성혁(Seong Hyuk Lee),김종민(Jong Min Kim),조민행(Minhaeng Cho),이정희(Jung Hee Lee),김주헌(Joo Heon Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The main objective is to investigate numerically on the self-organized interconnection of anisotropic conductive adhesives (ACAs) with low melting point alloy fillers. The new simulation code was developed on the basis of the finite volume method with continuum surface force (CSF) model and cubic interpolated propagation (CIP) method. To begin with, the present code was validated by comparing the numerical predictions with the results of the commercial code for the case of the collapse of liquid column. This study analyzes the conduction path formation during ACAs bonding process for different resin viscosity, volume fraction, and filler size. From the results, it is found that the volume fraction is very important in the formation of conduction path between the terminals, and the growth fraction of conduction path is significantly changed for varying resin viscosity.
코로나 방전기 없는 전기집진기 내의 나노입자 거동에 관한 수치 해석 연구
이진운(Jin Woon Lee),이성혁(Seong Hyuk Lee),장재성(Jaesung Jang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The present study aims to conduct extensive numerical simulation of nanoparticle capturing in a personal electrostatic precipitator without a corona discharger, where the electrical deposition mechanism is closely associated with electro-hydrodynamics (EHD). The simulation was performed by using a commercial code (COMSOL) that included the well-established Navier-Stokes equations and the electrostatic theories, together with Lagrangian-based motion of equations of nanoparticles inside a personal electrostatic precipitator. The designed electrostatic precipitator consisted of five positively-charged electrodes on the bottom and a large grounded electrode located on the top surface. For evaluation of the numerical simulation, the numerical predictions were compared with the well-known analytic solutions for electric fields of a simple wire-pipe type electrostatic system and experimental data (Jang et al., Sensors & Actuators A. 121 pp. 560-566).
이진운(J.W. Lee),유홍선(H.S. Ryou),이성혁(S.H. Lee) 한국전산유체공학회 2013 한국전산유체공학회 학술대회논문집 Vol.2013 No.5
The present study investigates the effect of spectral solar radiation on the thermal comfort in a vehicle compartment. For achieving this goal, transmittance and reflectance for automotive glass were measured to analyze the spectral characteristics of glass by using a spectrophotometer. Using the measurement data, extensive numerical simulations were conducted for three different cases by using the ANSYS Fluent 13.0. The Fanger model was also used for analysis of thermal comfort in the vehicle compartment. From numerical results, the temperature predicted for case 3 with considering spectral effect was approximately 3°C higher than that of case 1 without considering spectral effect. These results show that the spectral radiation effect should be considered for thermal comfort analysis
코로나 방전기가 없는 전기집진기의 미세입자 집진에 관한 수치해석
이진운 ( Jin Woon Lee ),장재성 ( Jae Sung Jang ),이성혁 ( Seong Hyuk Lee ) 한국분무공학회 2011 한국액체미립화학회지 Vol.16 No.2
This article presents computational fluid dynamics (CFD) simulations of sub-micron particle movements and flow characteristics in laboratory-scale electrostatic precipitator (ESP) without corona discharge, and for simulation, it uses the commercial CFD program (CFD-ACE) including electrostatic theory and Lagrangian-based equation for sub-micron particle movement. For validation of CFD results, a simple cylindrical type of ESP is simulated and numerical prediction shows fairly good agreement with the analytical solution. In particular, the present study investigates the effect of particle diameter, inlet flow rate, and applied electric potential on particle collection efficiency and compares the numerical prediction with the experimental data, showing good agreement. It is found that the particle collection efficiency decreases with increasing inlet flow rate because the particle detention time becomes shorter, whereas it decreases with the increase in sub-micron particle diameter and with the decrease of applied electric voltage resulting from smaller terminal electrostatic velocity.
코로나 방전기가 없는 전기집진기의 나노입자 집진에 관한 수치해석
이진운(J.W. Lee),장재성(J.S. Jang),이성혁(S.H. Lee) 한국전산유체공학회 2010 한국전산유체공학회 학술대회논문집 Vol.2010 No.5
This article presents computational fluid dynamics (CFD) simulations of nanoparticle movements and flow characteristics in laboratory-scale electrostatic precipitator (ESP) without corona discharge, and for simulation, it uses the commercial CFD program(CFD-ACE) including electrostatic theory and Lagrangian-based equation for nanoparticle movement. For validation of CFD results, a simple cylindrical type of ESP is simulated and numerical prediction shows fairly good agreement with the analytical solution. In particular, the present study investigates the effect of particle diameter, inlet flow rate, and applied electric potential on particle collection efficiency and compares the numerical prediction with the experimental data, showing good agreement. It is found that the particle collection efficiency decreases with increasing inlet flow rate because the particle detention time becomes shorter, whereas it decreases with the increase in nanoparticle diameter and with the decrease of applied electric voltage resulting from smaller terminal electrostatic velocity.
파장별 태양복사를 고려한 차량 내부의 온도 및 열쾌적성 예측
이진운(J.W. Lee),장은영(E.Y. Jang),김종민(J.M. Kim),조민행(M.H. Cho),최해진(H-J. Choi),최상열(S.Y. Choi),김주헌(J. Kim),유홍선(H.S. Ryou),이성혁(S.H. Lee) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
The main objective of this study is to investigate numerically thermal comfort and energy transport inside a passenger car considering spectral solar radiation. We used the discrete ordinates (DO) model considering spectral radiation effects to estimate the spatial temperature distribution for determining solar loads. The Fanger model is used for evaluation of thermal comfort in the passenger car. From numerical results, when considering spectral radiation effect, it is shown that higher cabin temperature is estimated and longer penetration of solar irradiation inside the cabin is predicted. These results show that the spectral radiation effect should be considered for thermal comfort analysis.
파장별 태양복사량 예측을 위한 차량 전면 유리의 광학특성 연구
이진운(Jinwoon Lee),이성혁(Seong Hyuk Lee),유홍선(Hong Sun Ryou),최상열(Sangyeol Choi),하종백(Jongpaek Ha) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The present study aims to investigate experimentally optical characteristics of automotive windshields for prediction of spectral solar irradiation which can be applied the thermal comfort systems, Using commercially available window glass in passenger cars, we measured reflectance, transmittance, and absorptance by using a spectrophotometer for three different glasses and estimated spectral solar irradiation on the basis of ASTM E891. From the experimental data, it is found that reflectance becomes nearly constant in the whole wavelength(<3.0 ㎛), whereas transmittance is highly dependent on wavelength. In particular, high absorbed and transmitted solar energy should be considered in the near IR region to establish elaborate thermal models including solar radiation.