Author(s): Gao Zhongxin; Xu Baorong; Ge Xinfeng
Linked Author(s): Zhongxin Gao
Keywords: Two-phase flow; Turbulent flow; Numerical simulation
Abstract: A fully three-dimensional numerical procedure based on the two-fluid model in a general curvilinear co-ordinate system is proposed for calculation of the turbulent bubbly two-phase flow in a 180 deg circular pipe bends. In this proposed procedure, an improved turbulent model, in which void fraction fluctuations of the dispersed phase (air) is taken into account in the κ-ε equations, is extended to the continuous phase (water), and an algebra turbulent model is used for the dispersed phase. In the numerical model, it can deal with the influence of air bubble size on the flow by means of dividing the dispersed phases into groups by air bubble diameter. As an example, this model is used to simulate the two-phase flow in a 180deg circular pipe bends under two inflow conditions, on base of experiment data. The calculation results of the distributions of pressure, velocity and void fraction calculated are proved reasonable and the calculated void fraction distribution is very agreement with the experimental results.
Year: 2009