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Journal of Flow Visualization and Image Processing
SJR: 0.161 SNIP: 0.312 CiteScore™: 0.5

ISSN Imprimir: 1065-3090
ISSN On-line: 1940-4336

Journal of Flow Visualization and Image Processing

DOI: 10.1615/JFlowVisImageProc.v6.i3.60
pages 221-229

SIMULTANEOUS MEASUREMENT OF VELOCITY FLUCTUATIONS AND SMOKE TRACER FLUCTUATIONS OF TURBULENT FLOW OVER A BACK-FACING STEP

M. Novak
Turboinstitut Ljubljana, Rovsnikova 7, 1000 Ljubljana, Slovenija
M. Hocevar
Turboinstitut, Rovsnikova 7, 1000 Ljubljana, Slovenia
Brane Sirok
Faculty of Mechanical Engineering, University of Ljubljana, Askerceva 6, P.O. Box 394, SI - 1000 Ljubljana, Slovenia
K. Oberdank
SIQ, Trzaska 2, 1000 Ljubljana, Slovenia

RESUMO

A correlation analysis of simultaneous measurements of velocity fluctuations taken by laser-doppler-anemometry (LDA), and of fluctuations of smoke tracer concentration measured with the aid of computer-aided visualization in selected segments of a turbulent flow field over a back-facing step was performed. In this article, results indicate that the two different techniques used, LDA for the velocity fluctuations and computer-aided visualization for the concentration measurements, provide accurate values when they are synchronized and analyzed separately. Simultaneous association of these two techniques allows us to determine the velocity-concentration correlations. The presented relationship between velocity and concentration fluctuations expresses fairly good agreement of both measured quantities.


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