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열교환기의 슬릿-웨이브 핀 성능에 대한 수치해석적 연구
최훈기,조성원,박용갑 대한기계학회 2022 大韓機械學會論文集B Vol.46 No.7
In this study, a numerical simulation was performed on the heat transfer and flow characteristics of a slit-wavy fin-and-tube heat exchanger. ANSYS FLUENT 2020 R1 was used to analyze. This study was conducted on different Reynolds numbers (66, 133, 332, 532, 665) and slit-wavy fin angles (0°, 5°, 10°, 15°, 20°). The results were visually represented using the dimensionless temperature contour and streamline. Finally, the heat transfer and flow characteristics according to the variation Reynolds number and slit-wavy fin angles was investigated using the j and f factors. When the Reynolds number was 66, the j and f factors of slit-wavy fins with an angle of 20° increased by 41% and 85%, respectively, compared to the plain fin. When the Reynolds number was 665, the j and f factors of slit-wavy fins with an angle of 20° increased by 83% and 145%, respectively, compared to the plain fin. 본 연구에서는 슬릿-웨이브 핀 튜브 열교환기의 열전달 및 유동 특성에 대한 수치해석을 수행하였다. 해석에는 ANSYS FLUENT 2020 R1을 이용하였다. Reynolds 수(66, 133, 332, 532, 665)와 슬릿-웨이브 핀의 각도(0°, 5°, 10°, 15°, 20°)의 변화에 대하여 해석을 수행하였다. 무차원 온도장과 유선을 사용하여 결과를 시각적으로 나타내었다. 최종적으로 Reynolds 수와 슬릿-웨이브 핀의 각도 변화에 따른 열전달 및 유동 특성을 무차원수 j factor와 f factor로 나타내었다. 평판 핀과 비교하여 슬릿-웨이브 핀의 각도가 20°인 경우, Reynolds 수가 66에서 j factor와 f factor는 각각 41%와 85% 증가하였고 Reynolds 수가 665에서는 각각 83%와 145% 증가하였다.
김내현(Nae-Hyun Kim),신태룡(Tae-Ryong Shin),한성필(Sung-Pil Han) 대한설비공학회 2007 설비공학 논문집 Vol.19 No.2
The row-by-row heat transfer characteristics of fin-and-tube heat exchangers were experimentally investigated. Three wavy fin samples having different rows (one, two and three) and one plain fin sample (three row) were tested for 600≤Re<SUB>D</SUB>≤4,000. The heat transfer data were obtained for individual rows, and the corresponding heat transfer coefficients were reduced from the data. Results showed that the heat transfer coefficients were strongly dependent on the tube row. The heat transfer coefficient decreased as the tube row increased. However, the row effect was different depending on the fin shape. For the wavy fin, the row effect significantly decreased as the Reynolds number increased, yielding approximately the same heat transfer coefficients at Re<SUB>D</SUB>?2,500. For the plain fin, however, the row effect lasted for the whole Reynolds number range. The increased mixing of bulk flow by wavy channels appears to induce high heat transfer coefficient (accordingly diminishing row effect) at down-stream rows. The heat transfer coefficients of individual rows were higher for heat exchangers having larger tube rows.
사인 웨이브 핀과 타원관으로 구성된 핀-관 열교환기의 공기측 성능
최병남(Byung-Nam Choi),풍익(Fung Yi),심현민(Hyun-Min Sim),김내현(Nae-Hyun Kim) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.5
Heat transfer and pressure drop characteristics of fin-and-tube heat exchangers having sine wave fins and oval tubes were investigated. Oval tubes having an aspect ratio of 0.6 were made, by deforming 12.7 mm round tubes. Twelve samples, having different fin pitch and tube row, were tested. The effect of fin pitch on the j and f factors was negligible. The effect of the tube row on the j factor, however, was different from that of common fin-and-tube heat exchangers having plain fins and round tubes. The highest j factor was obtained for a two-row configuration, while the lowest one was obtained for a one-row configuration. A possible reason was attributed to the flow mixing characteristics of the sine wave channel of the present geometry. Comparison with a plain fin-and-tube heat exchanger having 15.88 mm O. D. round tube reveals that the present oval fin-and-tube heat exchanger shows generally superior thermal performance, except for the one-row configuration.