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Forced-Rolling 시 Barge형 부유체 주위의 유동전산해석
김경진(K.J. Kim),강태진(T.J. Kang),조장근(J.K. Cho),박원규(W.G. Park) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
The present study is numerical simulation result to solve two-phase flow around a two-dimensional (2D) barge platform in forced-rolling. A platform with a draft equal to one half of its height was hinged at the center of gravity and free to roll with waves that had the same period as the natural roll period of a barge platform. In order to simulate the 2D incompressible viscous two-phase flow in a wave tank with the barge platform, the present study used the volume of fluid (VOF) method based on the finite volume method with a standard turbulence model. In addition, the dynamic mesh technique was used to handle the motion of the barge platform induced by the fluid-structure interaction. Consequently, the present results are able to predict the relevant aspects of the flow field and roll motion of the barge platform structure.
분사냉각모듈 내에 부착된 히트싱크에 따른 고출력 LED의 냉각성능에 관한 연구
구건모(G. M. Ku),김경진(K. Kim),박상희(S. H. Park),최성대(S. D. Choi),허정욱(J. W. Heo) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.6
The purpose of this study is to investigate cooling performance of high power LEDs from 100 to 200 W class by using a jet impingement cooling module. The numerical analysis of forced convection cooling inside cooling module is carried out using a multi-purpose CFD software, FLUENT 6.3. In the experiments, the LED cooling system consists of jet impingement module, heat exchanger, water reservoir, and pump. In the present study, the cooling performance of jet impingement cooling module is investigated to determine the effect of the heat sink types on the impinging surface, the space and length of fins. Numerical and experimental studies show the reasonable agreement of LED metal PCB temperature between those results and give the optimized design parameters such as the space of fin and the length of fin. Also, the pin fin type of heat sink is found to be more efficient than the plate type heat sink in jet impingement cooling.
고점성 밀봉제 인쇄용 마이크로 노즐 설계를 위한 유동해석
박규진(G.J. Park),곽호상(H.S. Kwak),손병철(B.C. Son),김경진(K. Kim) 한국전산유체공학회 2007 한국전산유체공학회지 Vol.12 No.4
A theoretical and numerical investigation is performed on the flow in a micronozzle for precision-controlled sealant dispenser. The working fluid is a highly viscous epoxy used as sealant in producing LCD panels, which contains a number of tiny solid spacers. Flow analysis is conducted in order to achieve the optimal design oj internal geometry of a nozzle. A simplified design analysis methodology is proposed for predicting the flow in the nozzle based on the assumption that the Reynolds number is much less than 0(1). The parallel numerical computations are performed by using a CFD package FLUENT. Comparison discloses that the theoretical model gives a good prediction on the distribution of pressure and wall shear stress in the nozzle. However, the theoretical model has a difficulty in predicting the maximum wall shear stress as found in a limited region near edge by numerical computation. The theoretical and numerical simulations provide the good guideline for designing a dispensing micronozzle.
박규진(G.J. Park),곽호상(H.S. Kwak),손병철(B.C. Sohn),김경진(K. Kim) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
A theoretical and numerical investigation is performed on the flow in a micronozzle for precision-controlled seal dispenser. The working fluid is a highly viscous epoxy used as sealant in producing LCD panels, which contains a number of tiny solid spacers. Flow analysis is conducted in order to achieve the optimal design of internal geometry of a nozzle. A simplified design analysis methodology is proposed for predicting the flow in the nozzle based on the assumption that the Reynolds number is much less than O(1). The parallel numerical computations are performed by using a CFD package FLUENT. Comparison discloses that the theoretical model gives a good prediction on the distribution of pressure and wall shear stress in the nozzle. However, the theoretical model has a difficulty in perdicting the maximum wall shear stress as found in a limited region near edge by numerical computation. The theoretical and numerical simulations provide the good guideline for designing a dispensing micronozzle.