Preferential particle concentration in wall-bounded turbulence with zero skin friction
Preferential particle concentration in wall-bounded turbulence with zero skin friction
复制标题
零表面摩擦的壁面湍流中的优先粒子浓度
DOI：
10.1063/1.4998547
复制
发表时间：
2017-11
影响因子：
4.6
通讯作者：
Andersson H.I.
中科院分区：
文献类型：
--
作者：
Yang K.;Zhao L.;Andersson H.I.
分散在湍流中的惯性粒子分布不均匀。除了它们倾向于在墙壁附近分离之外，它们还优先集中在与墙壁平行的平面上。我们在定制的流动中探索后一种现象，以检查在没有平均剪切的情况下与传统的（即剪切的）壁湍流相比，颗粒聚类的均匀性和各向异性。具有不同斯托克斯数的惯性粒子悬浮在湍流的库埃特-泊肃叶流中，其中一个壁移动，使得剪切速率在该壁处消失。因此，速度和涡度波动的各向异性与相对的非移动壁上的各向异性有质的不同，沿着非移动壁，准相干条纹结构占主导地位，类似于湍流管道和通道流。在两壁附近观察到优先粒子浓度。浓度的不均匀性是由应变涡选择机制引起的，而非线性...
Inertial particles dispersed in turbulence distribute themselves unevenly. Besides their tendency to segregate near walls, they also concentrate preferentially in wall-parallel planes. We explore the latter phenomenon in a tailor-made flow with the view to examine the homogeneity and anisotropy of particle clustering in the absence of mean shear as compared with conventional, i.e., sheared, wall turbulence. Inertial particles with some different Stokes numbers are suspended in a turbulent Couette-Poiseuille flow, in which one of the walls moves such that the shear rate vanishes at that wall. The anisotropies of the velocity and vorticity fluctuations are therefore qualitatively different from those at the opposite non-moving wall, along which quasi-coherent streaky structures prevail, similarly as in turbulent pipe and channel flows. Preferential particle concentration is observed near both walls. The inhomogeneity of the concentration is caused by the strain-vorticity selection mechanism, whereas the ani...
登录
查看更多内容
影响因子：
4.8
作者：
B. Pandey
通讯作者：
B. Pandey
DOI：
10.1016/j.ijheatfluidflow.2016.11.011
发表时间：
2017-02
影响因子：
2.6
作者：
Kun-tao Yang;Lihao Zhao;H. Andersson
通讯作者：
Kun-tao Yang;Lihao Zhao;H. Andersson
影响因子：
4.6
作者：
K. Lam;Sanjoy Banerjee
通讯作者：
K. Lam;Sanjoy Banerjee
影响因子：
3.1
作者：
J. Coakley;P. Chylek
通讯作者：
J. Coakley;P. Chylek
影响因子：
3.7
作者：
M. Bernardini;S. Pirozzoli;P. Orlandi
通讯作者：
M. Bernardini;S. Pirozzoli;P. Orlandi