干旱区生态环境知识资源中心(Arid): Sand-turbulence interaction in a high-Reynolds-number turbulent boundary layer under net sedimentation conditions

Arid

DOI	10.1016/j.ijmultiphaseflow.2019.07.001
	Sand-turbulence interaction in a high-Reynolds-number turbulent boundary layer under net sedimentation conditions
	Zhu, Hang-Yu 1; Pan, Chong 1; Wang, Jin-Jun 1; Liang, Yi-Rui 2; Ji, Xiao-Cang 2
通讯作者	Pan, Chong
来源期刊	INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
ISSN	0301-9322
EISSN	1879-3533
出版年	2019
卷号	119 页码:56-71
英文摘要	Simultaneous two-phase particle image/tracking velocimetry (PIV/PTV) measurements are conducted on a particle-laden turbulent boundary layer (TBL) over a horizontal smooth-flat plate under net sedimentation conditions. Dilute desert sand grains with a median diameter of 203 mu m and bulk volume fraction of O(10(-5)) are used as the discrete phase, and the characteristic Reynolds number of the TBL is relatively high (Re-tau = 5500 based on the friction velocity u(tau) and boundary layer thickness delta). The two-dimensional velocity filed in the streamwise/wall-normal plane is measured by four CCD cameras aligned along the streamwise direction, which resolves a wide spectrum of the scales, ranging from small-scale energetic eddies to large-scale motions (LSMs) in the TBL. An improved phase separation algorithm and discrete particle matching method are developed for two-phase measurements. The results presented here provide new information concerning the effect of high-inertia particles with a dilute concentration on wallbounded turbulence, especially at high Re. Analysis of the velocity spectrum of the gas phase reveals, for the first time, that the presence of sand grains with a size on the order of the Kolmogorov length scale attenuates turbulence fluctuation by suppressing small-scale sweep-ejection cycles in the near-wall region. A critical layer (y/delta=0.12 or y(+) = 670) is found to partition the streamwise evolution of both the local concentration and the streamwise mean velocity of the sand grains into a non-equilibrium nearwall region and a quasi-parallel outer region. In addition, a balance between the strength and probability between the sweep and ejection events of sand grains is reached at this layer. Such a critical layer might be a good indicator of the upper bound of the particle saltation process, in which LSMs are believed to play a significant role. (C) 2019 Elsevier Ltd. All rights reserved.
英文关键词	Particle-turbulence interaction Sand-laden turbulent boundary layer Large-scale motions Particle image/tracking velocimetry
类型	Article
语种	英语
国家	Peoples R China
收录类别	SCI-E
WOS记录号	WOS:000489191700005
WOS关键词	DIRECT NUMERICAL-SIMULATION ; CHANNEL FLOW ; SUSPENDED SEDIMENT ; HEAVY-PARTICLES ; PREFERENTIAL CONCENTRATION ; TRACKING VELOCIMETRY ; SOLID PARTICLES ; FLAT-PLATE ; WALL ; LADEN
WOS类目	Mechanics
WOS研究方向	Mechanics
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216475
作者单位	1.Beijing Univ Aeronaut & Astronaut, Minist Educ, Key Lab Fluid Mech, Beijing 100191, Peoples R China; 2.Lanzhou Univ, Minist Educ, Key Lab Mech Disaster & Environm Western China, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Zhu, Hang-Yu,Pan, Chong,Wang, Jin-Jun,et al. Sand-turbulence interaction in a high-Reynolds-number turbulent boundary layer under net sedimentation conditions[J]. 兰州大学,2019,119:56-71.
APA	Zhu, Hang-Yu,Pan, Chong,Wang, Jin-Jun,Liang, Yi-Rui,&Ji, Xiao-Cang.(2019).Sand-turbulence interaction in a high-Reynolds-number turbulent boundary layer under net sedimentation conditions.INTERNATIONAL JOURNAL OF MULTIPHASE FLOW,119,56-71.
MLA	Zhu, Hang-Yu,et al."Sand-turbulence interaction in a high-Reynolds-number turbulent boundary layer under net sedimentation conditions".INTERNATIONAL JOURNAL OF MULTIPHASE FLOW 119(2019):56-71.