Reduction of the Refrigerant-Induced Noise from the Transition of Flow Pattern by Decreasing Tube Diameter

  • Takushima, Akira (DAN Lab, Samsung Yokohama Research Institute) ;
  • Han, Hyung-Suk (Department of Mechanical Engineering, Pusan National University) ;
  • Jung, Wei-Bong (Department of Mechanical Engineering, Pusan National University)
  • 발행 : 2009.06.30


It is well known that a refrigerant-induced noise is caused by two-phase flow in the indoor unit of a heat pump air-conditioner. Especially when the flow pattern in a pipe is intermittent flow, the irregular noise occurs frequently. But it is very difficult to avoid this kind of the noise for the application of air-conditioner. Therefore, in this research, the flow patterns at two-phase flow state in a pipe of the indoor unit for the air-conditioner are researched using cycle simulator at typical cycle conditions. In order to find the relationship between refrigerant-induced noise and flow pattern, the noise patterns are investigated with respect to the estimated flow pattern from the various flow pattern maps. Base on the estimations of the flow patterns by those maps, the refrigerant-induced noise is evaluated as decreasing tube diameter, which can transit the flow pattern from slug to annular flow.



  1. Umeda, T., 1993, Reduction of Noise Caused by Gas-Liquid Two-Phase Refrigerant Flow through an Expansion Valve, JSME, Vol.59, No.557, pp.243-248
  2. Hirakuni, S., Smida, Y., Yamamoto, H., 1998, Study of Noise Reduction of Refrigerant for Capillary Tube in the Refrigerator, 32nd Conference Journal of Refrigeration and Air-Conditioning Association, Vol.4, pp.22-24
  3. Strasberg, M., 1956, Gas bubbles as source of sound in liquids, The Journal of the Acoustical Society of America, Vol. 28, No. 1, pp. 20-27
  4. Baker, O., 1954, Design of pipe lines for simultaneous flow of oil and gas, Oil and Gas Journal, Vol.53, pp.185-190
  5. Hashizume, K., 1983, Flow pattern and void fraction of refrigerant two=phase flow in a horizontal tube, Bulletin of the JSME, Vol.26, 1597-1602
  6. Taitel, Y. and Dukler, A., E., 1976, A model for predicting flow regime transitions in horizontal and near horizontal gas-liquid flow, AIChE journal, Vol.22, pp. 47-55
  7. Minnaert, W.K., On musical air bubbles and the sound of running water, Phil. Mag. 16, pp.235-248, 1933
  8. Whalley, P. B., 1999, Two Phase Flow and Heat Transfer, Oxford University Press