설비공학논문집 (Korean Journal of Air-Conditioning and Refrigeration Engineering)

  • 제25권6호
  • /
  • Pages.324-330
  • /
  • 2013
  • /
  • 1229-6422(pISSN)
  • /
  • 2465-7611(eISSN)
대한설비공학회 (The Society of Air-Conditioning and Refrigerating Engineers of Korea)
권호 표지
DOI QR코드

DOI QR Code

헤더-채널 분기관에서의 헤더 입구 형상이 2상 유동 분배에 미치는 영향에 대한 실험적 연구

Effect of Inlet Geometries on the Two-Phase Flow Distribution at Header-Channel Junction

  • 투고 : 2013.01.09
  • 발행 : 2013.06.10
PDF 다운로드
⟨ 이전 논문 다음 논문 ⟩

초록

The main objective of this work is to experimentally investigate the effect of inlet geometries on the distribution of two-phase annular flow at header-channel junctions simulating the corresponding parts of compact heat exchangers. The cross-section of the header and the channels were fixed to $16mm{\times}16mm$ and $12mm{\times}1.8mm$, respectively. Experiments were performed for the mass flux and the mass quality ranges of $30{\sim}140kg/m^2s$ and 0.3~0.7, respectively. Air and water were used as the test fluids. Three different inlet geometries of the header were tested:no restriction (case A), a single 8 mm hole at the center (case B), and nine 2 mm holes around the center (case C) at the inlet, respectively. The tendencies of the two-phase flow distribution were different, in each case. For cases B and C (flow resistance exists), more uniform flow distribution results were seen, compared with case A(no flow resistance), due to the flow pattern change to mist flow from annular flow at the inlet, and the flow recirculation near the end plate of the header.

키워드

참고문헌

  1. Lee, S. Y., 2006, Flow distribution behavior in condensers and evaporators, Proceedings of the 13th Int. Heat Transfer Conference, Sydney, Australia, August.
  2. Lee, S. Y. and Lee, J. K., 2005, An Experimental Study on Two-Phase Flow Distribution at Header-Channel Junctions of a Compact Heat Exchanger, Fifth International Conference on Enhanced, Compact and Ultra-Compact Heat Exchangers : Science, Engineering and Technology, British Columbia, Canada, Sept, pp. 11-16.
  3. Webb, R. L. and Chung, K., 2004, Two-phase flow distribution in tubes of parallel flow heat exchangers, Heat Transfer Engineering, Vol. 26, pp. 3-18.
  4. Hrnjak, P., 2004, Developing Adiabatic Two Phase Flow in Headers-Distribution Issue in Parallel Flow Microchannel Heat Exchangers, Heat Transfer Engineering, Vol. 25, pp. 61-68.
  5. Cho, H., Cho, K., Youn, B., Kim, Y.-S., and Kim, J. H., 2004, Two-phase Flow Distribution, Phase Separation and Pressure Drop in Multi-Microchannel Tubes, Korean Journal of Air-conditioning and Refrigeration Engineering, Vol. 16, No. 9, pp. 828-837.
  6. Vist, S. and Pettersen, J., 2004, Two-phase Flow Distribution in Compact Heat Exchanger Manifolds, Experimental Thermal and Fluid Science, Vol. 28, pp. 209-215. https://doi.org/10.1016/S0894-1777(03)00041-4
  7. Ahmad, M., Berthoud, G., and Mercier, P., 2009, General characteristics of two-phase flow distribution in a compact heat exchanger, Int. J. Heat and Mass Transfer, Vol. 52, pp. 442-450. https://doi.org/10.1016/j.ijheatmasstransfer.2008.05.030
  8. Winkler, C. M. and Peters, J. E., 2002, Refrigerant Droplet Size Measurements in Conjunction with a Novel Method for Improving Flow Distribution in Evaporators, Aerosol Science and Technology, Vol. 36, pp. 734-741. https://doi.org/10.1080/02786820290038429
  9. Rong, X., Kawaji, M., and Burgers, J. G., 1995, Two-phase Header Flow Distribution in a Stacked Plate Heat Exchanger, ASME FED Gas Liquid Flows, Vol. 225, pp. 115-122.
  10. Lee, J. K. and Lee, S. Y., 2004, Distribution of two-phase annular flow at header-channel junctions, Experimental Thermal and Fluid Science, Vol. 28, pp. 217-222. https://doi.org/10.1016/S0894-1777(03)00042-6
  11. Lee, J. K., 2010, Optimum Channel Intrusion Depth for Uniform Flow Distribution at Header-Channel Junctions, J. of Mech. Sci. and Tech., Vol. 24, pp. 1011-1017. https://doi.org/10.1007/s12206-010-0414-4
  12. Bernoux, P., Mercier, P., and Lebouche, M., 2001, Two-phase Flow Distribution in a Compact Heat Exchanger, Proc. of the 3rd Int. Conf. on Compact Heat Exchangers and Enhancement Technology for the Process Industries, Davos, Switzerland, pp. 347-352.
  13. Troniewski, L. and Ulbrich, R., 1984, Two-phase gas liquid flow in rectangular channels, Chem. Eng. Sci., Vol. 39, pp. 751-765. https://doi.org/10.1016/0009-2509(84)80182-7
  14. Lee, J. K., 2009, Two-phase flow behavior inside a header connected to multiple parallel channels, Experimental Thermal and Fluid Science, Vol. 33, pp. 195-202. https://doi.org/10.1016/j.expthermflusci.2008.03.009