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30° 경사 리브가 있는 확대 채널 통로 내의 열전달 증가
이명성,안수환,Lee, Myung Sung,Ahn, Soo Whan 대한설비공학회 2017 설비공학 논문집 Vol.29 No.8
The effect of different rib geometries such as V-shaped continuous (case A), parallel broken (case B), and V-shaped broken (case C) ribs on local heat transfer distributions and pressure drops in a divergent channel with $30^{\circ}$ inclined ribs on one wall or two walls was investigated for Reynolds numbers from 22,000 to 75,000. Top and bottom walls were insulated; two side walls were uniformly heated in the divergent channel. Heated walls were composed of 10 isolated coper sections and length-to-outlet hydraulic diameter ratio of 10. Rib height-to-outlet hydraulic diameter ratio was 0.1, and rib pitch-to-height ratio equaled 10. Results revealed that V-shaped continuous rib (case A) produced approximately 1.4 times higher average Nussselt number than in the parallel broken rib (case B), and V-shaped broken rib (case C) in the channel with two ribbed walls at Re = 54,000.
한 면에 ∧/∨형 리브가 있는 2벽면 수축 사각채널의 열전달 증가
이명성,유지의,정희재,최동근,하동준,고진수,안수환,Lee, Myung-Sung,Yu, Ji-Ui,Jeong, Hee-Jae,Choi, Dong-Geun,Ha, Dong-Jun,Go, Jin-Su,Ahn, Soo-Whan 한국마린엔지니어링학회 2016 한국마린엔지니어링학회지 Vol.40 No.4
양 벽면이 수축되는 채널에서 ${\vee}/{\wedge}$형 리브의 각도가 열전달에 미치는 효과를 실험적으로 조사하였다. 한 벽면에만 설치된 ${\vee}/{\wedge}$형 리브의 충돌 각은 각각 $30^{\circ}$, $45^{\circ}$, $60^{\circ}$ 그리고 $90^{\circ}$이다. 리브의 높이(e)는 10 mm 그리고 리브 간격(p)과 높이(e)비는 10으로 제작하였다. 길이가 1,000 mm인 시험 부는 입구의 단면적은 $100mm{\times}100mm$, 출구는 $50mm{\times}100mm$으로 제작하였다. 레이놀즈수가 22,000에서 75,000까지의 범위에서 실험을 수행하였다. 연구결과 전체적으로 레이놀즈 수가 높을수록 누셀트 수가 컸고, ${\wedge}$형 $45^{\circ}$ 리브가 가장 누셀트 수가 컸다. The effect of the rib angle-of-attack on heat transfer in the convergent channel with ${\vee}/{\wedge}$-shaped ribs was examined experimentally. Four differently angled ribs (a = $30^{\circ}$, $45^{\circ}$, $60^{\circ}$, and $90^{\circ}$) were placed to only the one sided wall. The ribbed wall was manufactured with a fixed rib height (e) of 10 mm and rib spacing (p)-to-height (e) ratio of 10. The convergent channel had a length of 1,000 mm and a cross-sectional areas of $100mm{\times}100mm$ at inlet and $50mm{\times}100mm$ at exit. The measurement was conducted for the Reynolds numbers ranging from 22,000 to 75,000. The results show that the Nusselt number is generally higher at higher Reynolds number and that an angle-of-attack of $45^{\circ}$ at the ${\wedge}$-shaped rib produces the greatest Nusselt number.
이명성(Lee Myung Sung),신정표(Shin Jeong Pyo),박보근(Park Bo Geun),정성수(Jeong Seong Soo),안수환(Ahn Soo Whan) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.11
The experimental researches on the heat transfer and friction factors in the ribbed divergent rectangular channel with the inlet hydraulic diameter inlet to exit hydraulic diameter ratio of 1.16 at test section were performed. The main experimental parameter is the ratio of rib pitch (p) to height(e), at which the ratios (p/e) of 6, 10, and 14 are considered. The straight ribbed square channel is includes as a comparison. The major findings are that the ratio of p/e=6 shows the highest values in the least heat transfer index and the ratio of p/e=10 indicates.