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손동현,손창현,하재훈,Son, D.H.,Sohn, C.H.,Ha, J.H. 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.6
This paper presents a numerical evaluation of the launch dynamics and thermo-fluid phenomena for gas generator launch eject system. The existing gas dynamic model for launching eject body used ideal gas and adiabatic assumption with empirical energy loss model. In present study, a turbulent Navier-Stokes solver with CHIMERA mesh is employed to predict the detail unsteady thermo-fluid dynamics for the launched body. The calculation results show that proper grid number is necessary for good agreement with experimental data. The important effects for accurate prediction are a gap distance and thermal boundary condition on the wall. The computational results show good agreement with experiment data.
노트북 LED 영상장치 내부의 전도열전달 해석과 성능 지수 평가
박일석(IS. Park),손창현(C.H Sohn),손동현(D.H. Son),백성민(S.M. Baik),박철(C. Park) 한국전산유체공학회 2011 한국전산유체공학회지 Vol.16 No.3
Dark Mura phenomena which can happen at the region with high temperature gradient in a Notebook LCD Monitor using LED light source has numerically been studied. The calculation was conducted under the nearly realistic conditions by considering the anisotropic thermal properties of materials and the real dimensions of each component. The two performance indices of LED monitor, i.e., the maximum temperature and the spacial gradient of temperature were examined for the various shapes, lengths and thickness of heat sink plate. Calculated results give more reasonable temperature distribution comparing with experimental results.