方案摘要
方案下载应用领域 | 其他 |
检测样本 | 其他 |
检测项目 | |
参考标准 | 暂无 |
Much progress has been made in the understanding of the phenomenon of drag reduction by dilute solutions of polymers since its discovery in 1948. While the use of advanced techniques in experiments and computational simulations have dramatically advanced our understanding of the phenomenon, a complete and conclusive explanation of the physics associated with the phenomenon is still lacking. In particular, drag reduction in boundary layers with injection has not been studied extensively to understand the processes and physics that govern the spread and mixing of the injected polymer in the flow. To overcome this limitation, in the present work, drag reduction due to polymer injection in a turbulent boundary layer is studied using simultaneous Particle Imaging Velocimetry (PIV) and Planar Laser Induced Fluorescence (PLIF). PIV is used to measure the velocity of the flow in the boundary layer and to calculate higher order velocity statistics. PLIF is used to study the distribution and spread of the injected polymer in the boundary layer by tracking a fluorescent dye mixed in with it. The polymer of choice, polyethylene oxide, is injected as a dilute solution into a fully turbulent Newtonian boundary layer and measurements of velocity and concentration are made at different downstream locations on the flat plate to study the effect of the polymer on the flow and the evolution of drag reduction. The data from the two measurement techniques are combined to calculate turbulent fluxes and to estimate the turbulent Schmidt number in polymer drag reduced flows.
在一个双稳湍流涡旋火焰中,对间歇性动态的时间-频率定位
Particle-laden Taylor-Couette流:高阶转变和径向局部波浪涡旋的证据
7根杆束的流体-结构相互作用:用实验数据对比数值模拟
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