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금성민(Sung-Min Kum) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.5
The purpose of this study is to develop a paddle-type dryer and to commercialize the dryer, in which mixing and drying can be done simultaneously. According to a performance test, a newly-designed paddle-type dryer can dry Chitosan salt to a low moisture contents below 0.3%. Also the newly-designed dryer can dry air pollution materials, because the dryer can operate in a closed system. The economic efficiency of a newly-designed system and an existing system was compared in a performance test. As a result, the economic efficiency of a newly-designed system was higher than an existing system. In conclusion, it is thought that the newly-designed system has a high commercial value.
충돌분류계에서 4각 난류촉진체에 의한 전열증진에 관한 실험적 연구
금성민(Seong-Min Kum),김종렬(Jong-Yul Kim),서정윤(Jeong-Yun Seo) 한국태양에너지학회 1994 한국태양에너지학회 논문집 Vol.14 No.1
본 연구는 2차원 충돌공기 분류계에서 공기의 흐름 방향과 수직이 되게 설치한 평판전열면 전방에 전열증진을 목적으로 난류촉진체인 정 4각 rod(폭 6㎜)의 pitch를 50㎜로 고정할 때 노즐출구속도(2, 8, 14, 18 ㎧), 노즐출구로 부터 전열면 사이의 거리 (H/B=2, 6, 10, 14) 및 rod 와 전열면 사이의 간극(C=1, 2, 4, 6㎜)을 변화시킬 때의 전열특성과 가시화 실험을 통해 유동특성을 규명한 결과 최대 열전달계수를 나타내는 조건은 H/B=10, C=1 ㎜이며 최대 전열증진율은 H/B=2, C=1 ㎜로서 rod를 설치하지 않은 평판보다 약 62% 증진된다. This research has been proceeded in the two-dimensional impinging air jet system, in which an impinging flat plate has been set up vertically to the way of air flow, and the pitch of square rod (width 6㎜), a turbulence promoter, has been fixed to be 50㎜ in front of impinging flat plate for the purpose of enhancement of heat transfer. With the experimental apparatus, we studied the characteristics of heat transfer in each case, changing nozzle exit velocity (2, 8, 14, 18 m/s), distance rate from nozzle exit to flat plate(H/B=2,6,10,14) and distance of rod and heating surface. Also we studied the characteristics of air flow through visualization.<br/> As a result, the condition that shows the maximum heat transfer coefficient was H/B=10, C=1㎜. And the maximum heat transfer growth rate was H/B=2, C=1㎜, which was improved about 62%, compared to the case to use a flat plate without a rod.
충돌분류계에서 WIRE MESH를 이용한 열전달 증진에 관한 연구
금성민(S.M.Kum),김동춘(D.C.Kim),유지오(J.O.Yoo),이창언(C.E.Lee),임장순(C.S.Yim) 한국태양에너지학회 1997 한국태양에너지학회 논문집 Vol.17 No.1
본 연구는 2차원 충돌공기분류계의 포텐셜코어 영역에서 열전달증진을 목적으로 노즐출구와 전열면사이에 메쉬를 설치한후 노즐출구 속도, 메쉬와 전열면사이의 간극, 노즐출구와 전열면사이의 거리를 변화시킬 때의 열전달특성을 메쉬를 설치하지 않은 경우와 비교 검토한 것으로 메쉬를 설치했을 때에는 분류가 전열면에 충돌하면서 소분류로 분할되어 발생하는 난류에 의해 충돌영역에서 열전달성능이 좋아지며, 또한 벽면분류영역으로 진행하면서 홀과 홀사이의 밑부분에서 일나는 가속으로 인해 열전달성능이 향상된다. 특히 메쉬와 전열면사이의 간극을 변화시켰을 경우 정체점부근에서는 간극이 클수록, 벽면분류영역에서는 간극이 작을수록 전달성능은 향상되며 U=18m/s, H/B=s, C=1인 경우에는 메쉬를 설치하지 않은 평판보다 평균 약 44%의 열전달증진 효과과 있었다. 그리고 본 실험결과를 기존의 난류촉진체를 이용한 연구결과와도 비교 검토하였다. The objective of this research was to investigate the enhancement of heat transfer by wire mesh in impinging air jet system at the potential core region.<br/> The first experiment was carried out without mesh between nozzle exit and flat plate and the second experiment was done with mesh between them.<br/> When mesh was installed in front of the plate, heat transfer has been increased due to the acceleration between rectangular halls and divided small jet<br/> In case clearances are changed, heat transfer comes to maximum under the condition of C= 1mm, irrespective of nozzle exit velocity and H/B.<br/> Also the average heat transfer enhancement rate of a flat plate with mesh has been increased about 44% at maximum under the condition of U=18m/s, H/B=2 and C=l mm, compared to the result of a flat plate without mesh.
금성민 ( Sung Min Kum ) 한국액체미립화학회 2008 한국액체미립화학회지 Vol.13 No.1
This experimental study was carried out to examine the heat transfer characteristics of impinging air jet on a flat plate with a set of right angled triangle rods. Each right angled triangle rod in the array was positioned normal to the flow direction and parallel to the flat plate surface. The clearances from a right angled triangle rod to flat plate surface (C=1, 2 and 4 mm) and the distance from nozzle exit to flat plate (H=100 and 500 mm) were changed for the pitch between each right angled triangle rods (P=40 mm). As a result, heat transfer shows best performance at the clearance of C=1 mm, in case clearance changed, and the average heat transfer enhancement rate increased up to 47% compared to the result of a flat plate without a right angled triangle rod.