【摘要】 气液两相段塞流是液塞和长气泡在空间和时间上的交替,在流动过程中表现出间歇性和不稳定性。系统地研究了水平管中段塞流持液率、压力和压差的波动特性。结果表明,段塞流持液率的概率密度分布为双峰分布,高持液率峰对应于液塞区,低持液率峰对应于液膜区;在压力的概率密度分布中,当压力测试点到管道出口之间的段塞单元数目少时,压力分布出现双峰分布;当压力测试点到管道出口之间的段塞单元数目多时,压力分布出现单峰分布;压差信号分布呈单峰分布。这些特征为流型识别提供了可靠的段塞流标识。更多还原

【Abstract】 Slug flow was a flow of long bubbles and liquid slugs alternating in space and time,and under flowing conditions,it is intermittent and unstable.The fluctuation characteristics of liquid holdup,pressure and differential pressure of slug flow were investigated in a 40 m long,50 mm I.D.horizontal pipeline.By statistical analysis,it was found that the probability density distribution of the liquid holdup was bimodal distribution.The high liquid holdup peak was in correspondence with liquid holdup of the slug body and the low liquid holdup peak with liquid holdup of the film.The liquid holdup which was in correspondence with the respective peaks of probability density function was consistent with the mean liquid holdup of smooth stratified film and liquid slug.Moreover,the distribution of pressure was unimodal distribution or bimodal distribution,depending on the number of slug units,and the differential pressure distribution was unimodal distribution.These characteristics provide dependable slug identities for flow pattern identification.更多还原