黏度对垂直上升管段塞流流动规律的影响

为研究在不同黏度的条件下的垂直管段塞流流动特性,进行了实验和数值模拟研究,对不同黏度下的截面压力、含液率、压差波动信号及压降值进行分析.结果表明:液相黏度的增大使气塞长度减小,并缩短至7.5～9倍的管径,段塞周期缩短,管道截面压力和压差波动会随之加快,平均持液率也逐渐增大,Mukherjee-Brill模型无法准确预测高黏油气流动的持液率,VOF(volume of fluent model)模型的持液率计算精度较高.液相黏度的变化对段塞流压降有一定影响,实验和模拟计算中都出现了负摩阻压降现象,总压降随着黏度增大而增大;Beggs-Brill模型的压降计算精度随着黏度的增加而降低,Hagedorn-Brown模型和VOF模型对压降的预测效果较好,误差低于15％,可见优于其他模型.

Influence of liquid viscosity on slug flow characteristics of vertical upword pipe

In order to study the characteristics of slug flow in vertical upward pipes under different viscosity conditions, experimental work and numerical simulation were carried out. The fluctuating signals of cross section pressure, liquid holdup, pressure difference and pressure drop under different viscosity were obtained and these?data?had been?processed. The results show that the length of the gas plug is reduced to 7.5-9 times of pipe diameter and the period of slug flow will be shortened as the viscosity increases, the fluctuation of pressure and differential pressure in the pipe section are changed quickly, and the average liquid holdup will ?also gradually be increased.The Mukherjee-Brill model can not accurately predict the liquid holdup of high viscosity oil-gas flow,and the VOF model has a high accuracy of liquid holdup calculation. The changes of liquid viscosity has a certain influence on the pressure drop of slug flow. The phenomenon of negative frictional pressure drop appears in both the experiment and the simulation , and the total pressure drop increases with the increase of viscosity. The computational accuracy of the Beggs-Brill model will decrease as the viscosity increases. The Hagedorn-Brown model and the VOF model predict pressure drop better, with errors below 15%, which is seen to be better than the other models.