Loading...

Study of behavior of two phase flow in vertical large diameter pipe

Kebriayi, M. H ; Sharif University of Technology | 2010

823 Viewed
  1. Type of Document: Article
  2. DOI: 10.1115/IMECE2010-39659
  3. Publisher: 2010
  4. Abstract:
  5. Knowledge of Air-water two phase flows is significant to different engineering systems such as chemical reactors and power plant and petrochemical and petroleum industry. One of the most industrial cases of two phase flow is two phase flow in vertical large pipes. In this paper in order to find two phase flow behavior along vertical large diameter pipes we simulate air inlets with different number of holes and different hole diameters in the same flow rate of air. In addition, flow characteristics such as cross-sectional void fraction and velocity and pressure were considered. To achieve this aim, main equations of flow have been developed for investigation of flow behavior in air-water two phase flows. 3-D numerical analyses were performed by a designed and written CFD package which is based on volume of fluid (VOF) approach. Geometries, which have been studied in this article, are round tubes with diameter of 5 cm and with length of 1 and 5 m. The fluid is assumed to be viscous and incompressible. The pressure-velocity coupling is obtained using the SIMPLEC algorithm. The results showed that at the entrance of the pipe the effect of air inlet geometry is significant while at the whole pipe this effect suppressed. Furthermore increasing the velocity at the inlet can increase average void fraction and decrease pressure loses along the pipe axis. Numerical results were compared with available empirical correlations and this comparison shows good agreement between this work and empirical correlations
  6. Keywords:
  7. 3-D numerical analysis ; Air-water two phase flows ; Average void fraction ; Empirical correlations ; Engineering systems ; Flow charac-teristics ; Large diameter pipes ; Pressure-velocity coupling ; Air ; Air intakes ; Fluid dynamics ; Two phase flow ; Void fraction ; Pipe
  8. Source: ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE), 12 November 2010 through 18 November 2010 ; Volume 7, Issue PARTS A AND B , November , 2010 , Pages 1735-1741 ; 9780791844441 (ISBN)
  9. URL: http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1616570