STUDY ON LENGTH OF MIXED REGION DURING PURGING OF GAS PIPELINE
Low Reynolds k-ε turbulence model was employed for the 2-D numerical simulation of the dispersion. The result indicates that the concentration distribution profile in the mixed region appears asymmetric along the axial direction, which has a characteristic of short head and long tail. Purging velocity, pipe diameter and the length of purged pipe are the three key factors to the length of mixed region. The mixture length increases very fast in the initial purging state and then changes slowly with the length of purged pipe increasing. The length of mixed region is shorter during the turbulent flow than that during the laminar flow. But when in the turbulent flow, increasing velocity has less effect on shortening the length of mixed region. Under the same turbulent velocity, the length of mixed region increases with the increase of the pipe diameter. But the impact of the pipe diameter on the length of mixed region is weakening while the turbulent intensity is high. And nitrogen- natural gas mixing length is greater than nitrogen-air mixing length with 1％～2％.
X. L. Guo B. F. Bai
State Key Lab of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi,710049, CHINA
国际会议
首届亚洲计算传热与计算流体国际会议(2007 Asian Symposium on Computational Heat Transfer and Fluid Flow)
西安
英文
2007-10-08（万方平台首次上网日期，不代表论文的发表时间）