An experimental contribution to near-wall measurements by means of a special laser Doppler anemometry technique

D. Poggi, A. Porporato, L. Ridolfi

Research output: Contribution to journalArticlepeer-review

53 Scopus citations

Abstract

A new experimental technique for the investigation of near-wall turbulence using laser Doppler anemometry is presented, which allows an accurate measurement of the flow field very close to the wall, with good resolution and a high data rate. Such a technique is tested in a fully developed turbulent flow (with Reynolds numbers between 4,300 and 67,000) by carrying out a careful statistical analysis of the streamwise and wall-normal velocity components within the near-wall region, at distances from the wall ranging from approximately y+ = 1 to y+ = 100. The velocity profiles, Reynolds stresses and higher-order moments of the two-dimensional boundary layer are presented. The results, which are in agreement with the most recent data in the literature, testify the validity of the proposed experimental solution. Moreover, the accuracy of the results allows the friction velocity to be calculated as the intercept at the wall of the best linear fit of the total stress profile; in this way, an unambiguous examination of the normalized statistics is possible.

Original languageEnglish (US)
Pages (from-to)366-375
Number of pages10
JournalExperiments in Fluids
Volume32
Issue number3
DOIs
StatePublished - Mar 2002
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Computational Mechanics
  • Mechanics of Materials
  • General Physics and Astronomy
  • Fluid Flow and Transfer Processes

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