Drag Reduction by Polymers in Turbulent Pipe/Channel Flows

来源 :35th IAHR World Congress(第三十五届国际水利学大会) | 被引量 : 0次 | 上传用户:kkndbz
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
The addition of few parts per million of long chain polymers in turbulent flows can drastically reduce the friction drag, which is known as Drag Reduction phenomenon (DR).
其他文献
糖和肽的相互识别与作用在生命活动中有着重要的作用。对肽识别糖的研究不仅有助于理解两者相互作用的分子机理,而且有助于新的医疗检测器和化学传感器的开发与应用。
蛋白质糖基化是一种重要的蛋白质翻译后修饰方式。糖基化异常与许多疾病密切相关,因此研究蛋白质糖基化具有重要意义。生物样品中糖蛋白丰度低,因此对糖蛋白进行分离富集非常重要。凝集素亲和法是目前应用最广泛的糖蛋白/糖肽分离富集方法。
The study on the overall steady of hydraulic hoist which works in pushing state is carried out, By analytical calculation, three-dimensional finite element method and other method, the analysis of def
The flow structure around a cylinder group in cross flow was investigated experimentally.The experiments were conducted in an open channel.The cylinder group was consisted of 19 identical cylinders ar
In this paper, in the case of adopting underflow energy dissipation to lower the apron elevation to form the stilling pool, combining with a certain hydraulic engineering of overflow dam, the author h
The chute bottom aerator is often used to protect discharge works against cavitation erosion caused by high velocity flows and it has become more and more popular as it has been proved to be an econom
Aeration facility is often the most useful and effective measure to protect discharge release structures from cavitation damage caused by high speed flow.
Rock parameters are the fundamental components of the constitutive law of the wall rock in the diversion tunnel.The determination of rock parameters based on real observations of wall rock deformation
In this paper, the design schemes of arc gate and plane gate for a hydropower junction project are studied in two hydraulic sectional models with scale 1∶40 and 1∶35.
Particle image velocimetry (PIV) was used to measure the impeller outlet flow in submersible mixer.The synchronization problem during measurement was soveld by using shaft encoder and frequency dividi