水平圆管内油水两相分散混合液的流动特征

Investigation on the characteristics of oil-water two-phase dispersed flow in horizontal pipes

管道内油水两相分散流动中的压降受相含率、相分布和流速等参数的影响,研究表明同一混合液流速条件下,随体积含油率的增大,压降呈现为先增加后减小的趋势,在连续相的相转化点处压降达到峰值。该文结合均相流模型和非牛顿流体流动理论,对管道内油水两相流动的压降进行分析,结果显示已有混合液表观黏度预测模型计算得到的压降与实验值存在较大偏差。综合考虑管道流动中油水两相的相分布特征,优化得到了油水分散混合液表观黏度的预测模型,可应用于计算流动中的压降,且精度均在10%以内,为管道混输系统的设计,以及两相分散流动理论的发展提供可靠的理论依据。

The pressure gradient of oil-water two-phase dispersed flow in pipe is affected by series of parameters included phase holdup,phase distribution and flow rate.The pressure gradient increases as the increasing of oil volume fraction firstly and decreases after the peak where the phase inversion happened.The prediction of pressure gradient was researched by combining the homogeneous flow model and the non-Newtonian fluid flow theory in this work.It is poor to calculate the pressure gradient by the existed apparent viscosity prediction models.And a series of new apparent viscosity prediction models was introduced which considers the characteristics of dispersed phase distribution.In conclusion,the given apparent viscosity prediction model can be used to calculate the pressure gradient of oil-water dispersed flow,which is with the accuracy of 10%.It is important to the design of the pipeline transportation system and the development of two-phase dispersed flow theory.