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구준모(Junemo Koo),강용태(Yongtae Kang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Nanofluids have been studied as possible alternatives for heat transfer fluids to improve the efficiency of heat exchangers. There are deviations of measured effective thermal conductivities between research-groups, and the mechanisms of the effective thermal conductivity enhancement of nanofluids are not confirmed yet. In this study, the effects of particle shape on the effective thermal conductivity enhancement are discussed and presented as a possible explanation of the deviations. The particle motion effect is found to be negligible for nanofluids of high aspect ratio cylindrical particles, which is believed to be important for nanofluids of spherical particles, while the percolation network formation and contact resistance play dominant roles in determining the effective thermal conductivity.
구준모(Junemo Koo),정정열(Jungyeul Jung),강용태(Yongtae Kang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
A new one-dimensional simulation model to predict the surface coverage and average thickness of coating films obtained from spin coating processes is developed adopting moving mesh technique. The effects of initial profile, d ispensed volume, solvent vapor pressure, relative humidity and initial v iscosity on the coating film geometry are investigated numerically. The initially dispensed volume, solvent vapor pressure, initial viscosity and wafer rotation speed are found to be effective parameters to control the surface coverage and average film thickness. The relations between spin coating process parameters and the film geometry parameters, surface coverage and average film thickness, are derived from the new model. It is found that the photoresist solution consumption per a given size of chips could be reduced by optimizing the operation parameters.
이수경(SuKyoung Lee),송주영(JooYoung Song),강용태(YongTae Kang),김효상(HyoSang Kim),우성민(SungMin Woo) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.6
The triple-effect absorption refrigeration system has three solution heat exchangers between generators and absorbers. Plate heat exchangers are used widely in HVAC and refrigeration industry due to their high thermal efficiency and compactness. In this study, the simulation algorithm is developed to analyze the performance of plate type solution heat exchangers and determine the optimal number of plates. The number of plates and pressure drop were estimated according to the change of chevron angles(30°, 45°, 60°). It was found that the optimal chevron angle is 45° at the simulation conditions.