DOI QR코드

DOI QR Code

Evaluation of Bubble Size Models for the Prediction of Bubbly Flow with CFD Code

CFD 코드의 기포류 유동 예측을 위한 기포크기모델 평가

Bak, Jin-yeong;Yun, Byong-jo
박진영;윤병조

  • Received : 2015.12.01
  • Accepted : 2016.01.29
  • Published : 2016.03.31

Abstract

Bubble size is a key parameter for an accurate prediction of bubble behaviours in the multi-dimensional two-phase flow. In the current STAR CCM+ CFD code, a mechanistic bubble size model $S{\gamma}$ is available for the prediction of bubble size in the flow channel. As another model, Yun model is developed based on DEBORA that is subcooled boiling data in high pressure. In this study, numerical simulation for the gas-liquid two-phase flow was conducted to validate and confirm the performance of $S{\gamma}$ model and Yun model, using the commercial CFD code STAR CCM+ ver. 10.02. For this, local bubble models was evaluated against the air-water data from DEDALE experiments (1995) and Hibiki et al. (2001) in the vertical pipe. All numerical results of $S{\gamma}$ model predicted reasonably the two-phase flow parameters and Yun model is needed to be improved for the prediction of air-water flow under low pressure condition.

Keywords

two-phase flow;air-water flow;bubbly flow;bubble size model

References

  1. Yao W. and Morel C., Volumetric interfacial area prediction in upward bubbly two-phase flow, Int. J. Heat Mass Transf., 47(2), 307-328, 2004, https://doi.org/10.1016/j.ijheatmasstransfer.2003.06.004
  2. Yeoh G. H. and Tu J. Y., A unified model considering force balances for departing vapour bubbles and population balance in subcooled boiling flow, Nuclear Engineering and Design,235(10), 1251-1265, 2005 https://doi.org/10.1016/j.nucengdes.2005.02.015
  3. Lo S. and Zhang D.H., Modelling of break-up and coalescence in bubbly two-phase flows, The Journal of Computational Multiphase Flows, 1(1), 23-28, 2009 https://doi.org/10.1260/175748209787387106
  4. Yun B. J., Development of advanced analysis technology for the core-catcher component against severe accident, Final Report (2012M5A4A1047940), Pusan national univ., 2013
  5. Hibiki T., Ishii M. and Xiao Z., Axial interfacial area transport of vertical bubbly flows, Int. J. Heat Mass Transf., 44(10), 1869-1888, 2001 https://doi.org/10.1016/S0017-9310(00)00232-5
  6. Yun, B. J., Splawski, A., Lo, S. and Song, C. H., Prediction of a subcooled boiling flow with advanced two-phase flow models, Nuclear engineering and design, 253, 351-359, 2012 https://doi.org/10.1016/j.nucengdes.2011.08.067
  7. Troshko A. A. and Hassan Y. A., A two-equation turbulence model of turbulent bubbly flows, International Journal of Multiphase Flow, 27(11), 1965-2000, 2001 https://doi.org/10.1016/S0301-9322(01)00043-X
  8. Antal S.P. and Lahey Jr. R.T., Flaherty J.E., Analysis of phase distribution in fully developed laminar bubbly two-phase flow, International Journal of Multiphase Flow, 17(5), 635-652, 1991 https://doi.org/10.1016/0301-9322(91)90029-3
  9. Bozzano G. and Dente M., Shape and terminal velocity of single bubble motion: a novel approach, Computer and Chemical Engineering, 25(4), 571-576, 2001 https://doi.org/10.1016/S0098-1354(01)00636-6

Acknowledgement

Grant : BK21플러스

Supported by : 부산대학교