油气输送管线中液滴的湍流扩散特性研究

Modified droplet turbulent diffusion model in horizontal oil/gas transport pipeline

在对气核中液滴运动进行详细分析的基础上,通过考虑剪切气流中液滴所受升力作用对液滴终端沉降速度的影响,首次在理论上实现了在液滴扩散特性计算中计及剪切升力的作用,同时在所建立的计算模型中还综合考虑了液滴和其携带流体间的局部滑移以及液膜表面粗糙度的影响,应用该模型对油气输送条件下液滴扩散特性计算的平均计算误差从 28. 2%降低到 16. 8%。

One modified droplet turbulent diffusion model was proposed by taking consideration of the effect of shear lift force on the droplet terminal settling velocity, meanwhile the effects of local relative slip between droplet and its carrying fluid together with the interface roughness of liquid film were considered. Applying this model, the average calculated error of decay coefficient for droplet diffusion is reduced greatly from 28.2% to 16.8% for oil-gas two-phase flow.