Journal of the Korean Society of Manufacturing Process Engineers (한국기계가공학회지)

The Korean Society of Manufacturing Process Engineers (한국기계가공학회)
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Numerical Analysis of Freezing Phenomena of Water around the Channel Tube of MF Evaporator

MF증발기 채널관 주위의 결빙현상에 대한 해석적 연구

  • Received : 2019.10.22
  • Accepted : 2019.11.24
  • Published : 2020.01.31
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Abstract

In this study, the process of freezing around two consecutively arranged channel tubes used for evaporator heat exchange was numerically investigated. Numerical results confirmed that the vortex occurred between the front channel and the rear channel and also that the vortex occurred due to the rapid change of the channel at the rear of the rear channel. These vortices were found to play a role in reducing the ice layer to some extent by the growth of the ice layer at the front and rear of the channel tube. The freezing layer showed a tendency to gradually increase as it passed through the channel pipe. As the wall temperature in the channel pipe decreased, the thickness of the freezing layer increased. As the flow rate of water slowed, the thickness of the freezing layer became thicker. In particular, in the case of a slow flow rate of 0.03 m/s, the freezing layers of the front channel pipe and the rear channel pipe were connected to each other. The narrower the channel, the thinner the freezing layer was in both the front and rear channel tubes. It is found that these thin freezing layers are caused by the low thickness of the temperature boundary layer formed around the channel tube.

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References

  1. Jeon, S. H., Kim, Y. H., Lee, K. J., "Numerical Study of Heat Transfer Enhancement on Microchannel Plate Heat Exchanger with Channel Shape", Proceedings of the KSME Spring Conference, pp. 1000-1005, 2007.
  2. Yan, S. N,, Park, Y. M., Jeong, Y. M., Lee, J. K., Park, Y. M., "An Experimental Study on the Performance of Aluminum Microchannel Tube Condensers According to the Number of Passes", Proceedings of the The Society of Air-Conditioning and Refrigerating Engineers Of Korea, pp. 1214-1219, 2010.
  3. Park, C. Y., Pega, H., "Experimental and Numerical Study on Microchannel and Round-tube Condensers in a R410A Residential Air-conditioning System", International Journal of Refrigeration, Vol. 31, pp. 822-831, 2008. https://doi.org/10.1016/j.ijrefrig.2007.10.007
  4. Park, Y. S., Sung, H. S., Suh, J. S., "A Study on the Basic Shape of an MF Evaporator," Journal of the Korean Society of Manufacturing Process Engineers, , Vol. 18, No. 6, pp. 39-44, 2019. https://doi.org/10.14775/ksmpe.2019.18.6.039
  5. Hong, S. W., Lee, Y. T., Chung, J. D., Kim, S. T., Kim, T, "Phase Change Analysys on the Whole Vertical Ice-On-Coil Type Latent Thermal Storage Tank," Proceeding KSME, pp. 905-908, 2015.
  6. Flaman, M. T. and Shah, N. N., "Structural Integrity Investigation of Ice Plugging Procedure on Feeder Pipe", Ontario Hydro Research Division, 1985.
  7. Suh, J. S., Ro. S. T., "Analysis of Ice - Formation Phenomena for Fully Developed Laminar Water Flow in Concentric Circular - Tube Annuli," Transactions of the Korean Society of Mechanical Engineers B, Vol. 21, No. 11, pp. 1552-1561, 1997. https://doi.org/10.22634/KSME-B.1997.21.11.1552
  8. Suh, J. S., "Analysis of Ice - Formation Phenomena for Laminar Water Flow in a Concentric Tube," Proceeding of Air-Conditioning and Refrigeration Engineering, pp. 185-190, 1996.
  9. Suh, J. S., Kim, M. G., Ro, S. T., Yim, C. S., "Ice - formation phenomena for laminar water flow in a stenotic tube," Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 10, No. 1, pp. 11-21, 1998.
  10. Jeong, G. H., Ahn, B. J., Choi, B. I., Kim, K. S., "Numerical Analysis of Phase Change and Natural Convection Phenomena during Pipe Freezing Process," Proceeding Korean Soc. Mech. Eng., pp. 1263-1269, 2002.
  11. Lee, C. H., Suh, J. S., "Numerical Analysis on the Freezing Process of Internal Water Flow in a L-Shape Pipe," Journal of the Korean Society of Manufacturing Process Engineers, Vol. 17, No. 6, pp. 144-150, 2018. https://doi.org/10.14775/ksmpe.2018.17.6.144
  12. Park, Y. S., Suh, J. S., "Numerical Analysis of Freezing Phenomena of Water in a U-Type Tube," Journal of the Korean Society of Manufacturing Process Engineers, Vol. 18, No. 6, pp. 52-58, 2019. https://doi.org/10.14775/ksmpe.2019.18.12.052