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심우섭,송기천,황태연,신영철,Shim, W.S.,Song, K.C.,Hwang, T.Y.,Shin, Y.C. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.5
The movements of small particles distributed uniformly in a steady flow in rectangular chambers having inlets and outlets were simulated numerically. Low Reynolds number turbulent model with a two-equation ($k-{\varepsilon}$) which describes the turbulent characteristics was applied to predict the air flow pattern and particles movements under the condition of the various locations and size of ducts. The calculation results show that the prediction of recirculation zone and stagnation point of flow is important to determine the particles behavior according to the design change. These results will be useful in designing the rectangular chambers for collective protection.
홍성진(S. Hong),손기헌(G. Son),심우섭(W. Shim) 한국전산유체공학회 2018 한국전산유체공학회지 Vol.23 No.3
Numerical study on reducing computation time is performed for sessile droplet evaporation. The conservation equations of mass, momentum and vapor concentration are solved by employing the level-set method which is modified to include the effect of phase change. One of the major difficulties in computing the whole period of droplet evaporation arises from the fact that the surface tension term in the momentum equation causes a serious time step restriction for stable computation. In this work, the time step constraint is avoided by simplifying the droplet shape as a spherical cap whose curvature is spatially uniform so that the surface tension term is treated as a part of the pressure term. The droplet surface is calculated geometrically and then the level-set function is reconstructed from the droplet surface. The numerical result for sessile droplet evaporation in stationary air shows good agreement with the experimental data reported in the literature. The effects of external flow velocity, temperature and contact angle on the droplet evaporation rate are quantified.