摘要
对一种新合成的两性界面活性剂N,N,N-三甲胺-N′-油酸酰亚胺在二维通道内的减阻特性进行了实验研究.为了能进行低温测试,以20%的甘醇不冻液为溶剂.溶液质量浓度范围为(5×10-5)^(1×10-3),测试温度为-5℃和25℃.用粒子成像测速仪对减阻流动的湍流特性进行了测量.实验表明,这种新型界面活性剂溶液呈现明显减阻特性,且减阻特性与浓度和温度均有很大的关系,最大减阻值可高达83%.该界面活性剂中加入NaNO2,在低温和低浓度条件下能有效改善减阻效果,而在常温和高浓度条件下反而降低减阻效果.添加界面活性剂抑制了湍流速度脉动和湍流涡脉动,使雷诺剪切应力完全消失.
Experiments were conducted to study the drag-reduction characteristics of a newly synthesized zwitterionic surfactant solution （oleyl trimethylaminimide） in a two-dimensional channel. Ethylene glycol aqueous solution （EG/W） with mass fraction of 20% was used as solvent for measurements at subzero temperatures. The surfactant mass concentration ranged from 5 × 10^-5 to 1× 10^-3 , and the temperature was -5℃ and 25℃ respectively. Turbulence features of the surfactant drag-reducing flow were also measured by using particle image velocimetry （PIV） technique. It was found that the novel zwitterionic surfactant solution showed drag-reduction characteristics which were greatly affected by both concentration and temperature. The maximum drag-reduction could reach 83%. The addition of NaNO2 to the novel surfactant solution could improve the drag-reduction performance at low temperatures and concentrations, whereas it had a negative effect at high temperatures and concentrations. Turbulent velocity and vortex fluctuations were suppressed and Reynolds shear stress was diminished by adding surfactants into the turbulent flow.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2006年第11期2750-2754,共5页
CIESC Journal
基金
国家自然科学基金项目(50521604
50536020)
教育部留学回国人员科研启动基金项目.~~
关键词
新型
两性界面活性剂
减阻
湍流特性
novel
zwitterionic surfactant
drag-reduction
turbulence characteristics
