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운동량변화가 온도변화가 있는 비정상 난류유동장에 미치는 영향
유근종,전원대,김수태 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-
In analysis of unsteady turbulent flows with temperature variation, 3 different turbulence models of k-e model, modified k-e model, and Full Reynolds Stress(FRS) model, are applied. 3 Test Cases are selected for verification. These are vertical jet flows with water and sodium, and parallel jet flow with sodium. For overall verification of turbulence models, test cases are analyzed with 2-D and 3-D assumptions. Analysis yields the conclusion that 3-D computation with FRS betters others. However, modified modeling for near wall effect is required to improve its heat transfer characteristic analysis.
2개의 분리판 사이에서 분사되는 평행 3중 분류에 의한 비정상 난류 유동장 해석
유근종,최훈기,정지훈 國立 昌原大學校 產業技術硏究院 2004 産技硏論文集 Vol.18 No.-
LES is applied to analyze unsteady turbulent triple-jet water flows which are commonly found in thermal stripping phenomena. Current analyses performed to find effect of different SGS models on flow field with partition plates. LES tends to predict higher level of RMS temperatures compared to those of experiment indicating very active mixing effect among triple jets. The LES is found to be able to provide reliable frequency information of temperature fluctuation. The different SGS models show no significant difference in prediction ability, while Smagorinky-Lilly model yields slightly stronger mixing activity.
Epoxidized soybean oil을 이용한 polyurethane foam의 합성
유근종,김경종,이대수 한국공업화학회 2002 한국공업화학회 연구논문 초록집 Vol.2002 No.0
최근 환경에 대한 관심 증대로 인해 보다 환경 친화적인 제품이 요구되고 있으나 현재 사용되고 있는 폴리우레탄 폼은 유해한 물질을 다량 함유하고 있기 때문에 그 폐기 과정에서 않은 문제들을 발생시키고 있다. 천연 소재인 콩기름은 그 양이 풍부하고 지속적인 공급이 가능하며 자연 친화적이라는 장점을 갖고 있으며 불포화도가 평균 4.5이다. 본 연구에서는 콩기름을 이용하여 폴리우레탄 폼을 제조함으로써 환경 문제를 극복하는 동시에 분자구조상의 소수성을 이용한 기름 흡수제와 같은 산업적 응용분야를 증가시키는데 그 목적이 있다. 에폭시화된 콩기름을 삼차 아민 촉매 하에서 반응 온도 조건을 변화시켜가며 diethanolamine과 반응시켜 가장 많은 에폭시기가 개환 되는 최적의 상태를 확인하였다. 이를 토대로 다양한 수산가를 갖는 폴리올을 합성하고 polymeric MDI를 isocyanate로 사용하여 MDI index를 변화시키면서 촉매와 발포제 투입 하에서 다양한 형태의 폴리우레탄 폼을 합성하였다. 형성된 폼의 중요한 특성인 밀도, 압축강도, 열전도도, cell구조 등을 조사하였고 기존의 폴리올을 이용하여 제조된 폴리우레탄 폼과의 비교를 통해 그 적용 가능한 응용 분야를 검토하였다.
유근종 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-
Applicability of the pressure gradient method which is formulated based on pressure gradient is verified against turbulent flow analysis. In the pressure gradient method, pressure gradient instead of pressure itself is obtained using continuity constraint. Since correct pressure gradient is found only when mass conservation is satisfied, pressure gradient method can reflect physics of flow field properly. The pressure gradient method is formulated with semi-staggered grid system which locates each primitive variables on the same grid point but evaluates pressure gradient in-between. This grid system ensures easy programming and reflection of correct physics in analysis. For verifying applicability of this method, the pressure gradient method is applied to turbulent flow analysis with low Reynolds number k-ω model and algebraic stress model. Turbulent flows include fully developed channel flow, backward-facing step flow, conical diffuser flow, and three dimensional annular diffuser flow. Prediction results show that the pressure gradient method can be applied to turbulent flow analysis. However, the pressure gradient method requires somewhat ling computation time. Proper way to find optimum under-relaxation factor, γ , is also need to be developed.
유근종 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1
Applicability of the pressure gradient method which is formulated based on pressure gradient is verified against turbulent flow analysis In the pressure gradient method, pressure gradient instead of pressure itself is obtained using continuity constraint. Since correct pressure gradient is found only when mass conservation is satisfied, pressure gradient method can reflect physics flow field properly. The pressure gradient method is formulated with semi-staggered grid system which locates each primitive variables on the same grid point but evaluates pressure gradient in-between. This grid system ensures easy programming and reflection of correct physics in analysis. For verifying applicability of this method, the pressure gradient method is applied to turbulent flow analysis with low Reynolds number k-εmodel and algebraic stress model Turbulent flow, and three dimensional annular diffuser flow. prediction results show that the pressure gradient method can be applied to turbulent flow analysis. However the pressure gradient method requires somewhat long computation time proper way to find optimum under-relaxation factor, γ, is also need to be developed.
유근종,한진우,김수태 창원대학교 산업기술연구소 2001 産技硏論文集 Vol.15 No.-
LES is applied to analyze transient turbulent flows which may cause thermal stripping. The LES is formulated based on Sub-Grid k model. For evaluating performance of the LES, two test cases of vertical water jet flow and parallel sodium jet flow are selected. Through the analysis, the LES confirms that it has proper ability to predict time dependent flow variables such as magnitude of temperature fluctuation and its frequency. For the better prediction, however, the LES is required to be improved through further evaluation of various SGS models and implementation of temperature SGS model into its energy equation.
유근종 湖西大學校工業技術硏究所 1985 工業技術硏究所論文集 Vol.4 No.-
The question arises as to how much mutuality is possible and desirable between tehrapist and client. The writer places Buber's I-Thou relationship or dialogue at the center of therapy in this study. The writer would not accept that the counselor generally confines him to listening to the patient, that is to say that he is as neutral mild, colorless, self-effacing, uninterfering, and undemanding. On the other hand, the inclusion-therapy in precise sense of Buber is founded on mutuality, trust, and partnership in a common situation. The clients have developed a consistent watchfulness of their environment and great alertness regarding interpersonal experiences. Therefore, they are frequently capable of emotional eavesdropping, as it were, on other persons, including, their counselor. Accordingly, it can be imagined in the direction of seeing the healing as two way process in which both therapist and client may be helped and healed.