Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
권호 표지
DOI QR코드

DOI QR Code

Heat transfer characteristic and flow pattern investigation in micro-channels during two-phase flow boiling

이상 유동 비등 시 마이크로 채널에서의 열전달 특성과 유동양식 조사

  • Choi, Yong-Seok (Division of Marine Engineering, Korea Maritime and Ocean University) ;
  • Lim, Tae-Woo (Division of Marine Engineering, Korea Maritime and Ocean University)
  • Received : 2015.05.08
  • Accepted : 2015.08.20
  • Published : 2015.09.30
Download PDF
⟨ Previous Next ⟩

Abstract

Two-phase flow boiling experiments were conducted in 15 micro-channels with a depth of 0.2 mm, width of 0.45 mm, and length of 60 mm. FC-72 was used as the working fluid, and the mass fluxes ranged from 200 to $400kg/m^2s$. Tests were performed over a heat flux range of $5-40kW/m^2$ and vapor quality range of 0.1-0.9. The heat transfer coefficient sharply decreased at a lower heat flux and then was kept approximately constant as the heat flux is increased. Based on the measured heat transfer data, the flow pattern was simply classified into bubbly, slug, churn, and wavy/annular flows using the existing method. In addition, these classified results were compared to the transition criterion to wavy/annular regime. However, it was found that the existing transition criterion did not satisfactorily predict the transition criterion to annular regime for the present data.

본 연구에서는 깊이 0.2 mm, 폭 0.45 mm, 길이 60mm 그리고 채널의 개수는 15개인 마이크로 채널에서 이상 유동비등에 관한 실험을 수행하였다. 작동유체로는 FC-72가 사용되었으며, 실험은 질량유속과 열유속 각각 $200-400kg/m^2s$, $5-40kW/m^2$ 범위와 증기 건도 0.1-0.9 범위에서 수행되었다. 열전달 계수는 낮은 열유속에서는 급격하게 감소하였으며, 일정 열유속 이상에서는 거의 일정하게 유지되었다. 측정된 열전달 계수로부터 기존의 방법을 이용하여 기포류, 슬러그류, 천류 그리고 파형/환상류의 유동양식으로 분류하였다. 또한 분류한 유동양식의 결과를 파형/환상류 영역으로의 천이 기준과 비교하였다. 하지만 기존의 천이 기준으로는 본 연구의 실험결과를 만족스럽게 예측하지 못하였다.

Keywords

References

  1. S. Lin, P. A. Kew, and K. Cornwell, "Flow boiling of refrigerant R141B in small tubes," Chemical Engineering Research and Design, vol. 79, no. 4, pp. 417-424, 2001. https://doi.org/10.1205/026387601750282346
  2. W. Qu and I. Mudawar, "Flow boiling heat transfer in two-phase micro-channel heat sinks-I. Experimental investigation and assessment of correlation methods," International Journal of Heat and Mass Transfer, vol. 46, no. 15, pp. 2755-2771, 2003. https://doi.org/10.1016/S0017-9310(03)00041-3
  3. X. Huo, L. Chen, Y. S. Tian, and T. G. Karayiannis, "Flow boiling and flow regimes in small diameter tubes," Applied Thermal Engineering, vol. 24, no. 8-9, pp. 1225-1239, 2004. https://doi.org/10.1016/j.applthermaleng.2003.11.027
  4. O. Baker, "Simultaneous Flow of oil and gas," Oil and Gas Journal, vol. 53, pp. 185-195, 1954.
  5. K. Hashizume, "Flow pattern and void fraction of refrigerant two-phase flow in a horizontal pipe," Bulletin of The Japan Society of Mechanical Engineers, vol. 26, no. 219, pp. 1597-1602, 1983. https://doi.org/10.1299/jsme1958.26.1597
  6. J. Weisman, D. Duncan, J. Gibson, and T. Crawford, "Effect of fluid properties and pipe diameter on two-phase flow pattern in horizontal lines," International Journal of Multiphase Flow, vol. 5, no. 6, pp. 437-462, 1979. https://doi.org/10.1016/0301-9322(79)90031-4
  7. J. W. Coleman and S. Garimella, "Characterization of two-phase flow patterns in small diameter round and rectangular Tubes," International Journal of Heat and Mass Transfer, vol. 42, no. 15, pp. 2869-2881, 1999. https://doi.org/10.1016/S0017-9310(98)00362-7
  8. S. G. Kandlikar, "Two-phase flow patterns, pressure drop, and heat transfer during boiling in minichannel flow passages of compact evaporators," Heat Transfer Engineering, vol. 23, no. 1, pp. 5-23, 2002. https://doi.org/10.1080/014576302753249570
  9. S. Garimella, J. D. Killion, and J. W. Coleman, "An experimentally validated model for two-phase pressure drop in the intermittent flow regime for circular microchannels," Journal of Fluids Engineering, vol. 124, no. 1, pp. 205-214, 2002. https://doi.org/10.1115/1.1428327
  10. T. Harirchian and S. V. Garimella, "Effects of channel dimension, heat flux, and mass flux on flow boiling regimes in microchannels," International Journal of Multiphase Flow, vol. 35, no. 4, pp. 349-362, 2009. https://doi.org/10.1016/j.ijmultiphaseflow.2009.01.003
  11. Y. S. Choi, T. W. Lim, and S. S. You, "Prediction methods for two-phase flow frictional pressure drop of FC-72 in parallel micro-channels," Journal of the Korean Society of Marine Engineering, vol. 38. no. 7, pp. 821-827, 2014 (in Korean). https://doi.org/10.5916/jkosme.2014.38.7.821
  12. T. W. Lim, S. S. You, H. S. Choi, and D. H. Kim, "Boiling heat transfer characteristics of deionized water in microchannel," Journal of the Korean Society of Miarine Engineering, vol. 35, no. 6, pp. 750-756, 2011 (in Korean). https://doi.org/10.5916/jkosme.2011.35.6.750
  13. Y. S. Choi, T. W. Lim, S. S. You, H. S. Kim, and H. S. Choi, "Boiling Heat Transfer Characteristics of FC-72 in Parallel Micro-channels," Journal of the Korean Society of Marine Engineering, vol. 38, no. 9, pp. 1032-1038, 2014 (in Korean). https://doi.org/10.5916/jkosme.2014.38.9.1032
  14. C. T. Crowe, Multiphase Flow Handbook, Taylor & Francis, 2006.
  15. J. G. Collier and J. R. Thome, Convective Boiling and Condensation, 3rd Ed., Oxford University Press, 1994.
  16. S. M. Zivi, "Estimation of steady-state steam void-fraction by means of the principle of minimum entropy production," Transactions of ASME, Journal of Heat Transfer, vol. 86, no. 2, 247-251, 1964. https://doi.org/10.1115/1.3687113

Cited by

  1. CFD validation for subcooled boiling under low pressure vol.40, pp.4, 2016, https://doi.org/10.5916/jkosme.2016.40.4.275
  2. Numerical Study on the Saturated Flow Boiling of Methane in Vertical Pipe vol.33, pp.6, 2021, https://doi.org/10.13000/jfmse.2021.12.33.6.1429