Flow Behavior and Turbulent Drag Reduction of Viscoelastic Fluids

被引：0
作者：
Tamano, Shinji [1 ]
机构：
[1] Nagoya Inst Technol, Grad Sch Engn, Showa Ku, Nagoya, Aichi 4668555, Japan
来源：
NIHON REOROJI GAKKAISHI | 2013年 / 41卷 / 05期
关键词：
Non-newtonian fluid; Viscoelastic fluid; Swirling flow; Vortex shedding; Turbulent boundary layer; Drag reduction; SWIRLING FLOW; REDUCING SURFACTANT; BOUNDARY-LAYER; NUMERICAL-SIMULATION; CHANNEL FLOW;
D O I：
暂无
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
The unsteady flow behavior and turbulent drag reduction were investigated experimentally and numerically. Regarding unsteady swirling flows of aqueous polymer solutions due to a rotating disc in a cylindrical casing, we found a new phenomenon of vortex shedding in which the ring vortex formed near the rotating disc was periodically shed away from the rotating disc. The numerical simulation of the confined swirling flow was also performed at low Reynolds numbers, in which the Giesekus model was used as a constitutive equation. For drag-reducing turbulent boundary layers of aqueous cationic and nonionic surfactant solutions, turbulence statistics and structures were investigated by the LDV and Ply systems. For the cationic surfactant solution, the additional maximum of the streamwise turbulence intensity near the center of boundary layer was explained by the bilayered structure model. The mechanism of the drag reduction was investigated by the direct numerical simulation of viscoelastic fluids.
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收藏
页码：289 / 300
页数：12
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