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Three-dimensional simulation of humid-air dryer using computational fluid dynamics
류진복,이성철,정치영 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.4
A three-dimensional (3-D), mathematical model for the analysis of the flow distribution in a humid-air dryer was developed employing a computational fluid dynamics package, FLUENT1. A thin-layer drying approach for a sphere-shaped object was coupled with 3-D modeling framework. The model was validated by comparing the simulated moisture content (MC) of red pepper with experimentally measured MC with drying time. The present model was employed to obtain optimized dryer design with the most homogeneous flow distribution inside the drying trays. Consequently, two parametric studies are presented and discussed: (i) varying inner structure, and (ii) varying drying objects in the dryer.
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세라믹 필터 장치의 내부 유동 흐름 및 고속 세척에 관한 연구
이성철,류진복 한양대학교 에너지·환경기술연구소 1999 에너지·環境技術論文集 Vol.5 No.-
IGCC 공정 등에서 고온 석탄 가스로부터 고체 분진을 분리하는데 높은 성능을 보이는 세라믹 필터에 대한 관심이 증대되고 있다. 그 필터는 외면에서 분진을 제거하고 일정 시간이 지나면 반대로 유체를 흘려주어 분진 덩어리를 제거하게 된다. 세정 시스템의 초점은 최적의 유속과 압력을 구하는데 있다. 그러나 이러한 값들은 reservoir의 압력뿐만 아니라 nozzle 크기, 필터 크기, 필터 투수도 (permeability)등 여러 가지에 영향을 받는다. 대부분에 있어 세정 성능향상을 위해 필터 위에 venturi를 장착하게 된다. 이 venturi에 대한 효과는 실험적으로 많이 입증되어 있지만 최적의 세정 시스템을 구하는 데에는 이에 대한 좀더 세밀한 해석이 필요하다. 본 연구의 목적은 venturi 형상에 따라 속도장과 압력을 구하고 그에 따른 세정의 효과를 면밀히 해석해 최적화된 venturi형상을 결정하는 것이다. 본 연구에서 네 가지 형상의 venturi에 대해 계산을 수행하였다. 그리고 계산 수행에 있어 일반 좌표계에 대한 Navier-Stokes 식과 압축성 효과 및 난류 효과 등이 포함되었다. 결과로서는 세번째 형상이 넷 중에 가장 좋은 것으로 나타났다. 또한 venturi형상에 따라 압력이 상당한 차이를 보이고 있음을 알 수 있다. Ceramic candle filters receive a great deal of attentions due to their high efficiency to separate solid particles from the hot coal gas in an integrated coal gasification cycle power generation processes (IGCC). The filter collects dust particles on the external surface, and the pulse jet reverse flow detaches the dust cake after a certain period. The design of cleaning system is targeting to obtain an optimum cleaning velocity and cleaning pressure. Since the measurement of the cleaning velocity and the cleaning pressure is very difficult at actual filtration condition, the cleaning system tends to use the sufficient reservoir pressure for cleaning. However, the cleaning effect depends not only on the reservoir pressure but also on the nozzle size, the filter size, and the filter permeability etc. In most cases, a venturi is placed on the top of the filter to improve cleaning efficiency. Those effects have been evaluated empirically, more analysis is required to design an optimum cleaning system. The purpose of this paper is to analyze the effect of the cleaning velocity and the cleaning pressure on the shape of venturi mounted on the top of the filter. The numerical analysis is based on the time-averaged Navier-Stokes equations written in their conservation from in a generalized non-orthogonal coordinate system. Compressibility effects in the turbulent flow was included through dilatation dissipation. Four different configurations of venturi have been numerically analyzed to find the optimum design of the cleaning system.
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이성철,홍민선,송은석,류진복,김병수,장영기 한국환경영향평가학회 1998 환경영향평가 Vol.7 No.1
Gaussian type models have limitations on predicting a detailed description of the near flow and pollution leads over complex terrains under neutral atmospheric conditions. Also, most models used recently have lack of ability to include atmospheric reactions. The model based on the numerical solution of the time-averaged Navier-Stokes equations and conservation equations needs to be developed to improve the limitations mentioned above. When the model was applied to the Shihwa area where the tracer experiment had been carried out, the simulation results have a great difference from the experimental result. There are two reasons that make the difference between the results by the model and the experiment First, the Shihwa area is not a complex terrain. Second, meteorological data is insufficient. Therefore, the model should be applied to predict they dispersion of air pollutants over complex terrain rather than flat terrain in order that the model could be verified because the model was developed for the prediction of the dispersion over a complex terrain.
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