미세유로의 단상 유동 및 열전달에 대한 실험적 연구Experimental Studies on Single Phase Flow and Heat Transfer in Microchannels
- Other Titles
- Experimental Studies on Single Phase Flow and Heat Transfer in Microchannels
- Authors
- 김병주; 김건일
- Issue Date
- 2008
- Publisher
- 대한설비공학회
- Keywords
- Single phase flow and heat transfer(단상유동 열전달); Microchannels(미세유로); Friction factor(마찰계수); Nusselt number(누셀트수); Thermally developing flow (열적 발달 유동)
- Citation
- 설비공학 논문집, v.20, no.12, pp.795 - 801
- Journal Title
- 설비공학 논문집
- Volume
- 20
- Number
- 12
- Start Page
- 795
- End Page
- 801
- URI
- https://scholarworks.bwise.kr/hongik/handle/2020.sw.hongik/22861
- ISSN
- 1229-6422
- Abstract
- An experimental study has been performed on the single phase flow and convective heat transfer in trapezoidal microchannels. The microchannel was about 270μm wide, 800μm deep. and 7mm long, which might ensure hydrodynamically fully-developed laminar flow at a low Reynolds number. The experiments were conducted with R113 and water, with the Reynolds number ranging from approximately 30 to 5000 for friction factor and 30 to 700 for the Nusselt number. Friction factors in laminar are found to be in good agreement with the predictions of existing correlation suggesting that a conventional analysis approach can be employed in predicting flow friction behavior in microchannels. However turbulent friction factors are hardly predictable by the existing correlations. The experimental results show that the Nusselt number is not a constant but increases almost linearly with the Reynolds number even the flow is fully developed (Re<100). The dependence of the Nusslet number on the Reynolds number is contradictory to the conventional theory. At a Reynolds number greater than 100, the Nusselt number increases slowly with the Reynolds number, where thermally developing flow is responsible for the increase of the Nusselt number with the Reynolds number.
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