Effects of the superhydrophobic surface on coherent structures in the turbulent boundary layer
Effects of the superhydrophobic surface on coherent structures in the turbulent boundary layer
复制标题
超疏水表面对湍流边界层相干结构的影响
DOI：
10.1007/s10409-022-22022-x
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发表时间：
2022-05
影响因子：
3.5
通讯作者：
Nan Jiang
中科院分区：
文献类型：
--
作者：
Yu-Fei Wang;Xin-Wei Wang;Xing-Yu Ma;Zhan-Qi Tang;Nan Jiang
研究了减阻超疏水表面对湍流边界层的影响。制造了大面积的SHPo表面（流向约为10δ99，展向约为5δ99），以充分演化TBL中的相干结构。利用时间分辨粒子图像测速技术在光滑表面和Reτ = 528的SHPo表面上进行了对比实验。采用单像元分辨率系综相关方法获得了高空间分辨率的速度剖面。在SHPo表面上y < 0.05δ99的近壁区观察到流向速度梯度的减小。通过对湍流统计数据的比较，发现在SHPo面上雷诺切应力降低了15.7%，湍流动能降低了12.3%。用瞬变本征正交分解（POD）和条件平均法研究了相干结构。SHPo表面Q2/Q4事件的强度分别下降了16.1%和12.7%。顺时针展向涡的数量大大减少了47%。通过空间两点相关分析，抑制了SHPo表面相干结构的流向尺度和壁面法向尺度。
The influence of drag-reducing superhydrophobic (SHPo) surface on turbulent boundary layer (TBL) is investigated. A large area of the SHPo surface (about 10δ99 in the streamwise and 5δ99 in the spanwise) is fabricated to fully evolve the coherent structures in the TBL. A comparative experiment is carried out by time-resolved particle image velocimetry on a smooth surface and the SHPo surface at Reτ = 528. Velocity profiles with high spatial resolution are obtained by the single-pixel resolution ensemble correlation method. The reduction of the streamwise velocity gradient is observed in the near-wall region of y < 0.05δ99 on the SHPo surface. By comparing the turbulence statistics, it is discovered that the Reynolds shear stress is reduced by 15.7%, and the turbulent kinetic energy is reduced by 12.3% on the SHPo surface. The coherent structures are investigated by the snapshot proper orthogonal decomposition (POD) and conditional average method. The intensity of Q2/Q4 events on the SHPo surface has declined by 16.1% and 12.7%, respectively. The number of clockwise spanwise vortices is substantially reduced by 47%. Through spatial two-point correlation analysis, the streamwise and wall-normal direction scales of the coherent structures on the SHPo surface are suppressed.
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影响因子：
3.7
作者：
Martell, Michael B.;Perot, J. Blair;Rothstein, Jonathan P.
通讯作者：
Rothstein, Jonathan P.
超疏水肋表面上湍流边界层的减阻和发夹包
影响因子：
2.5
作者：
Xin-wei Wang;Zi-ye Fan;Zhan-qi Tang;Nan Jiang
通讯作者：
Nan Jiang
滑移壁对湍流边界层阻力和相干结构的影响
影响因子：
3.5
作者：
Wang Xinwei;Wang Yufei;Tian Haiping;Jiang Nan
通讯作者：
Jiang Nan
DOI：
10.1007/978-3-540-72604-3_13
发表时间：
2006-11
期刊：
Bulletin of the American Physical Society
影响因子：
--
作者：
R. Volino;M. Schultz;K. Flack
通讯作者：
R. Volino;M. Schultz;K. Flack
超疏水表面平板边界层自然过渡位置的数值研究
影响因子：
4.6
作者：
Bin Liu;Yongming Zhang
通讯作者：
Yongming Zhang