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流动显示和图像处理期刊
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.1

ISSN 打印: 1065-3090
ISSN 在线: 1940-4336

流动显示和图像处理期刊

DOI: 10.1615/JFlowVisImageProc.v8.i2-3.130
10 pages

DISTRIBUTION OF COHERENT STRUCTURES IN TURBULENT PIPE FLOW

F. Schneider
Lehrstuhl fur Stromungslehre, Universitat Essen, D-45117 Essen, Germany
Wolfgang Merzkirch
Universitaet Duisburg-Essen Schwarzwaldstr. 18, 79102 Freiburg, Germany

ABSTRACT

Planar particle image velocimetry (PIV) measurements were performed in fully developed turbulent pipe flow at Reynolds numbers of the order of 105. Coherent structures were identified in the fluctuation field by using the swirling strength as the identification criterion. A number of properties of these structures were determined for later use in a model describing the principle of the cross-correlation ultrasound flowmeter by means of an approach based on systems theory.