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최윤환(Y. H. Choi),김태식(T. S. Kim),최광(K. Choi),이종훈(Y. W. Lee),이연원 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
In order to prevent the environmental pollution, the dryers are commonly used to treat sludge that one of sewages is polluting the quality of water. Generally, the drying method is various as to the property of material and use. Rotary dryer is a good apparatus to treat them. The rotary dryer is the way that is to make substance transmission and heat using hot air between sludge particle and heated gas. In this paper, we developed a 3-pass rotary dryer for various conditions. The working conditions of dryer are a raw sludge feed rate, input & output water content and operation time etc..
Chest type 김치냉장고의 열전달 및 내부유동 특성
김윤규(Y. K. KIM),정호윤(H. Y. JUNG),최윤환(Y. H. CHOI),이연원(Y. W. LEE) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
A kimchi refrigerator is a household electric product to develop with the wholly domestic technology for maturing and keeping kimchi. The principle of keeping is not yet revealed obviously. Therefore, inquiry into the fundamentals of things is a way to improve performance effective through experiments and numerical analysis. The flow and heat transfer characteristics in the kimchi refrigerator are investigated in this study.
Stand type 김치냉장고 하단부의 온도분포와 유동특성에 대한 연구
박영규(Y. K. Park),김윤규(K. Y. Kim),정호윤(H. Y. Jung),최윤환(Y. H. Choi),이연원(Y. W. Lee) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
Stand type kimchi refrigerator has been popular model and also will predict wide rise of the growth but studies of stand type kimchi refrigerator are not enough. Propose of this study is solution of time and economic problem caused by complicated and hard test by analysing flow characteristics and temperature distribution in stand type kimchi refrigerator. Analysis program is CFX-11.0 and used force convection generated by fan revolution. Result of analysis, there are different parts between left flow and right flow and this fact causes difference of temperature distribution in kimchi refrigerator.
Stand type 김치냉장고 상단부의 열전달 및 유동득성
한호윤(H. R. Han),김윤규(K. Y. Kim),정호윤(H. Y. Jung),최윤환(Y. H. Choi),이연원(Y. W. Lee) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
Kimchi refrigerator, as one of the necessary production is widely used in domestic. In this paper, authers are focused on decrease of temperature variation using by the force convection of the stand type Kimchi refrigerator. The temperature variation is about 1°C on both left and right sides in Kimchi refrigerator. And the temperature variation is between 1 to 2℃ on top and bottom in Kimchi Refrigerator. Cooling fluid flow in the gap, which was among the boxes of the top, middle and bottom are not smooth in cooling fluid flow. It was observed that the recycling area under the bottom of the evaporator. It's also observed that useless area of the fluid flow for the cooling recycling system.
정호윤(H. Y. Jung),권지혁(J. H. Kwon),이종훈(J. H. Lee),최윤환(Y. H. Choi),이연원(Y. W. Lee) 한국동력기계공학회 2005 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Now a days Automobiles are becoming more important in our life, the study on piston of engine is needed because, piston's cooling and lubrication of piston have an effect on the life and efficiency of engine directly. So, this study is about nozzle part of oil jet for cooling piston in the automotive engine. Piston exposes combustion gas of over 2000℃ and is shocked high pressure at the time of explosion shortly. Furthermore strong friction occurs by high speed rotation. The cooling system is considered from oil jet to piston. The previous system cooled the lower part of piston only. So, efficiency was low. To improve this system, make the oil gallery in the piston, and oil flows into the gallery. The value of oil flow rate into the gallery is important. Consequently, the point of this study is the research of investigation of flow characteristics for variable Re number. This study has been modelled by a commercial CFD code FLUENT, allowing to assess its validity.