TIME RESOLVED TOMOGRAPHIC PIV MEASUREMENTS OF ROUGH-WALL TURBULENT CHANNEL FLOW

被引：0
|
作者：
Miorini, Rinaldo L. [1 ]
Zhang, Cao [1 ]
Katz, Joseph [1 ]
机构：
[1] Johns Hopkins Univ, Baltimore, MD 21218 USA
来源：
PROCEEDINGS OF THE ASME FLUIDS ENGINEERING DIVISION SUMMER MEETING, 2013, VOL 1C: SYMPOSIA | 2014年
关键词：
BOUNDARY-LAYER; COHERENT STRUCTURES; FULLY ROUGH;
D O I：
暂无
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Rough-wall turbulent channel flow is investigated via time-resolved tomographic particle image velocimetry (pry). The optical refractive index of the transparent channel wall is matched with that of the liquid, allowing 3D measurements to be performed in the bulk flow as well as very close to the rough surface. The liquid is a concentrated solution of sodium iodide in water (62%-64% by weight). Roughness consists of staggered pyramidal elements that satisfy the "well-characterized" flow conditions. Our research is aimed at studying mechanisms involved generation of coherent structures as large-scale turbulence and the mean flow interact with the roughness elements, and their subsequent propagation away from the wall. We have adopted tomographic PIV to generate time-resolved, 3D data. Our measurements are performed at Reynolds number equal to 40000.
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页数：6
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