表面活性剂添加对气液两相流摩阻压降特性的影响

INFLUENCES OF SURFACTANT ON FRICTIONAL PRESSURE DROP IN GAS-LIQUID FLOW

研究了表面活性剂添加对水平管内气液两相流摩阻压降特性的影响 .实验中选用了环境友好的纯度为95 %的十二烷基硫酸钠 (SDS)作为减阻添加剂 ,浓度为 10 0mg·kg-1.结果表明阻力减小率与流型有关 ,分层流型的阻力减小率可达 83 3%、塞状流型和弹状流型的阻力减小率可达 83 2 %、环状流型的阻力减小率可达31 2 % .表面活性剂可以通过改变液体物性和改变流型两个方面来影响气液两相流摩擦压降 .

The influence of surfactant on the pressure drop in horizontal two-phase flow was investigated experimentally. Air/water and air/100 mg&middotkg-1 sodium dodecyl sulphate (with 95% purity grade) aqueous solution were used as working fluids. The results presented a demonstration that the drag reduction depended on flow regime. Drag reductions up to 83.3% for stratified flow, 83.2% for plug and slug flows and 31.2% for annular flow were observed in the experiments. The drag reduction was caused either by adding the surfactant itself or by the shift of flow regime due to the addition of surfactant.