摘要
为在一根打漩的管子中的旋涡特征和拖减少率上的表面活化剂答案的非牛顿的粘性的效果流动被压力落下大小，速度侧面大小和粘性大小调查。非牛顿的粘性被幂定律模型(蟿 = kD n ) 代表。使用的表面活化剂答案与 n 有砍变瘦粘性 < 1.0。在这研究的打漩的流动有腐烂打漩并且从 Rankin 鈥檚 的旋涡类型变化联合了旋涡到强迫的旋涡。这被显示出腐烂上的砍变瘦粘性的效果打漩紧张由旋涡范畴是不同的并且批评打漩有旋涡类型变化的数字取决于砍变瘦粘性。关键词打漩流动 - 拖减小 - 表面活化剂答案 - 非牛顿的液体 - 旋涡 - LDV CLC 数字 O357.
Effects of non-Newtonian viscosity for surfactant solution on the vortex characteristics and drag-reducing rate in a swirling pipe flow are investigated by pressure drop measurements, velocity profile measurements and viscosity measurements. Non-Newtonian viscosity is represented by power-law model （t= kD^π）. Surfactant solution used has shear-thinning viscosity with n 〈 1.0. The swirling flow in this study has decay of swirl and vortex-type change from Rankin＇s combined vortex to forced vortex. It is shown that the effect of shear-thinning viscosity on the decay of swirl intensity is different by vortex category and the critical swirl number with the vortex-type change depends on shear-thinning viscosity.
关键词
牛顿学说
粘性流体
表面活性剂
涡流
LDV
swirling flow, drag reduction, surfactant solution, non-Newtonian fluid, vortex, LDV.
