병렬 마이크로 채널에서 FC-72의 비등 열전달 특성
Boiling heat transfer characteristics of FC-72 in parallel micro-channels
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초록
본 연구에서는 병렬 마이크로 채널에서 FC-72의 비등 열전달 특성을 파악하기 위한 실험적 연구를 수행하였다. 병렬 마이크로 채널은 깊이 0.2 mm, 폭 0.45 mm, 길이 60 mm의 15개의 마이크로 채널로 구성되었으며, 실험은 열유속16.4 kW/m2와 25.6 kW/m2의 조건에서 수행되었으며, 이때 질량유속 300, 400 그리고 500 kg/m2s의 범위에서 이루어졌다. 실험을 통해 측정된 열전달 계수는 낮은 건도에서는 건도가 증가함에 따라 급격하게 감소하며, 일정 건도 이상에서는일정하게 유지되었다. 본 연구를 통해 마이크로 채널에서 FC-72의 비등 열전달 메커니즘을 확인하였으며, 실험에서 얻어진 열전달 계수는 열전달 계수를 예측하기 위한 기존의 상관식들과 비교·분석하였다.
Abstract
In this study, an experimental study was performed to understand the boiling heat transfer characteristics of FC-72 inparallel micro-channels. The parallel micro-channels contained channels having a 0.2 mm × 0.45 mm [H×W] cross section andlength of 60 mm. And heat flux was varied from 16.4 to 25.6 kW/m2 and mass fluxes from 300 to 500 kg/m2s. The measuredheat transfer coefficient was sharply decreased at lower vapor quality and then it was kept approximately constant as the vaporquality is increased. From the experimental results, the boiling heat transfer mechanism of FC-72 was confirmed and the measuredheat transfer coefficient was compared and analyzed with the existing correlations to predict the heat transfer coefficient.
참고문헌 (19)
- Y. Mishan, "Effect of developing flow and thermal re-gime on momentum and heat transfer in micro-scale heat sink", International Journal of Heat and Mass Transfer, 50, pp.3100~3114 (2007)
- L. Zhang, "Measurements and modeling of two-phase flow in microchannels with nearly constant heat flux boundary conditions", Journal of Micro Electro Mechanical Systems, 11(1), pp.12~19 (2002)
- G. M. Lazarek, "Evaporative heat transfer, pressure drop and critical heat flux in a small vertical tube with R-113", International Journal of Heat and Mass Transfer, 25, pp.945~960 (1982)
- M. W. Wambsganss, "Boiling heat transfer in a horizontal small-diameter tube", Journal of Heat Transfer, 115, pp.963~972 (1993)
- 임태우, "마이크로 채널에서 물의 비등 열전달 특성", 한국마린엔지니어링학회지, 35(6), pp.750~756 (2011), 한국마린엔지니어링학회
- Z. Y. Bao, "Flow boiling heat transfer of freon R11 and HCFC123 in narrow passages", International Journal of Heat and Mass Transfer, 43, pp.3347~3358 (2000)
- W. Qu, "Flow boiling heat transfer in two-phase micro-channel heat sinks – I. Experimental investigation and assessment of correla-tion methods", International Journal of Heat and Mass Transfer, 46, pp.2755~2771 (2003)
- H. J. Lee, "Heat transfer correlation for boiling flows in small rectangular horizontal chan-nels with low aspect ratios", International Journal of Multiphase Flow, 27, pp.2043~2062 (2001)
- J. S. Lee, "Two-phase flow in high-heat-flux micro-channel heat sink for refrigeration cooling applications: Part II- heat transfer character-istics", International Journal of Heat and Mass Transfer, 48, pp.941~955 (2005)
- S. M. Kim, "Universal approach to predicting saturated flow boiling heat transfer in mini", micro-channels – Part II. two-phase heat transfer coefficient, 2013, pp.64, 1239~1256
- S. Mukherjee, "Pumpless loop for narrow channel and micro-channel boiling", Journal of Electronic Packaging, 125, pp.431~441 (2003)
- Y. H. Jang, "Flow boiling heat transfer coefficients and pressure drops of FC-72 in small", International Journal of Refrigeration, 31, pp.1033~1041 (2008)
- K. Mishima, "Some characteristics of air-water two-phase flow in small diameter vertical tubes", International Journal of Multiphase Flow, 22(4), pp.703~712 (1996)
- P. A. Kew, "Correlations for the prediction of boiling heat transfer in small-diameter channels", Applied Thermal Engineering, 17(8-10), pp.705~715 (1997)
- W. Li, "A general criterion for evapo-rative heat transfer in micro", mini-channels, 2010, pp.53, 1967~1976
- A. Megahed, "Local flow boiling heat transfer char-acteristics in silicon micro channel heat sinks using liquid crystal thermography", International Journal of Multiphase Flow, 39, pp.55~65 (2012)
- L. Sun, "An evaluation of pre-diction methods for saturated flow boiling heat trans-fer in mini-channels", International Journal of Heat and Mass Transfer, 52, pp.5323~5329 (2009)
- G. R. Warrier, "Heat transfer and pressure drop in narrow rectangular chan-nels", Experimental Thermal and Fluid Science, 26(1), pp.53~64 (2002)
- S. G. Kandlikar, "A Model for correlation flow boiling heat transfer in augmented tubes and compact evapo-rators", Journal of Heat Transfer, 112, pp.219~228 (1990)