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이광훈(Gwang Hoon Rhee),박진수(Jin Soo Park),김주식(Joo Sik Kim) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
In this paper, a computational fluid dynamics(CFD) model is presented for biomass in the gasifier using Star-ccm+ ver. 4.02. Chemical reactions are modeled and a three-dimensional model is presented. Gasification process is simulated by Eddy-breaks up model. The arrhenius equation is used to present reaction rate in each reactions. Effects of equivalence ratio(ER) is studied. Compositions of carbon dioxide, carbon monoxide, hydrogen and methane are gained for the result of numerical simulation.
난류 박리 및 재부착 유동의 해석을 위한 저레이놀즈수 4-방정식 난류 열전달 모형의 개발
이광훈(Gwang-Hoon Rhee),성형진(Hyung-Jin Sung) 한국전산유체공학회 1995 한국전산유체공학회 학술대회논문집 Vol.1995 No.-
In the present study, an improved version of 4-equation low-Reynolds-number 4-equation model is proposed. The equations of the temperature variance (k_θ) and its dissipation rate(ε_θ) are solved, in concert with the equations of the turbulent kinetic energy(k) and its dissipation rate(ε). In the present model, the near-wall effect and the non-equilibrium effect are fully taken into consideration. The validation of the model is then applied to the turbulent flow bebind a backward-facing step and the flow over a blunt body. The predicted results of the present model are compared and evaluated with the relevant experiments.
루버 휜형 열 교환기의 유동특성에 대한 수치해석적 연구
이광훈(Gwang Hoon Rhee),박정아(Joung A Park),이대영(Dae-Young Lee) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.4
본 연구에서 수치해석적으로 루버휜형 고밀도 열 교환기 내의 유동특성을 평가하였다. 루버휜의 3 차원 형상을 사용하였으며, 루버피치, 루버각, 휜 피치, 휜 두께를 변화시켜가며 해석을 수행하였다. 본 연구는 전산 해석을 통하여 열 교환기 유용도 압력강하, 휜 효율 등을 측정하여 루버휜의 최적화 모델을 제안하기 위함이다. Numerical analysis of fluid flow performance over louvered fins in compact heat exchangers is presented in this study. This study shows a three dimensional analysis with louvered fin. Simulations were performed for different geometries with varying louver pitch. louver angle. fin pitch and fin thickness in louvered fin. By calculating the heat transfer efficiency. pressure drop. fin effectiveness at various conditions. this study will suggest optimization design for louvered fin.
The Detail Drawing of a Gudle Room
Shin-Ho Rhee,Gwang Hoon Rhee 국제온돌학회 2006 International Journal of Ondol Vol.1 No.1
A Zikhwa-Gorae(Directfire-Firetunnel) Gudle is composed in the order of Agungi(Fireplace- gate), Agungi-hureongi(Fireplace-in), Bunengki(Fireridge), Gudle-Gaezari(Gudle-Deepplace), Gorae(Firetunnel), Gorae-Gaezari(Firetunnel-Deepplace), Gulduk(Holebank) and Gusae(Chimney ). The detail drawings of a Gudul(traditional Ondol) are showed. Four kinds of the Gudle are Godeon-Gorae(Straight-Firetunnel) Gudle, Doedon-Gorae(Return-Firetunnel) Gudle and Heutn -Gorae(Scatter-Firetunnel) Gudle.
Numerical Comparative Analysis for Fluid Blowing Direction of Temperature in Gorae of GUDLE
Jong Min Moon,Shinho Rhee,Gwang Hoon Rhee 국제온돌학회 2008 International Journal of Ondol Vol.3 No.1
Ondol, Korean traditional heating system, has widely been used due to high thermal efficency based on its character of thermal dynamics. it has been also well known Ondol has improved real indoor thermal comfort compared to the other heating systems. Recently, a lot of numerical studies using CFD(Computational Fluid Dynamics) in order to understand interal thermal and flow field has been corned out. In present study, we find out the variation of temporal temperature in floor of traditional Goodie between Jul-Gorae and Doidon-Gorae, we have performed numerical analysis. According to flow rate streams, Weet-mok's temperature in a Doidon-Gorae is 7 t:: higher than Jul-Gorae 's. This asymmetry part has an influence on decreasing a standard deviation of the temperature.
Numerical Analysis for Temporal Variation of Temperature in Traditional Ondol
Jun Jung PaJk,Shin-Ho Rhee,Gwang Hoon Rhee 국제온돌학회 2006 International Journal of Ondol Vol.1 No.1
Gudul has been used since it was invented, and will be used continuously. But recently, we used rarely. One of the this reason is unequally floor temperature in Gudle because the distribution of heating air is not constant. So flow field in Gudul must be known for uniform temperature in floor. Recently, many fluid engineer have been performed the numerical analysis for the understanding of thermal and flow field based on the development of CFD(Computational Fluid Dynamics). In this paper, to find out the variation of temporal temperature in floor of traditional Gudle, we have performed numerical analysis. Initial temperature in floor is 20 t:' after 880 seconds later, maximum temperature become 2i.Oi t:'. ihour later, maximum temperature in floor become 34.5 t:' because continuously increase from 880 seconds.