Measurements of near wall velocity and wall stress in awall-bounded turbulent flow using digital holographic microscopic PIV and shear stress sensitive film

Omid Amili, Julio Soria

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearch

Abstract

In wall-bounded turbulent flows, a large portion of total turbulence production happens in the near wall region. Although the viscous and buffer layers are relatively easy for numerical simulations due to local low Reynolds numbers of the important structures, they are very difficult to study experimentally because of their physically small geometry. The aim of this paper is to measure the wall shear stress in a fully developed turbulent channel flow at moderately high Reynolds numbers using a novel stress meter which is capable of measuring surface forces over an extended region of the model. In addition, near wall region in a wall-bounded flow by means of digital holographic microscopic particle image velocimetry will be investigated. DHMPIV provides a solution to overcome the poor axial accuracy and the low spatial resolution. The paper addresses the experimental techniques, articulate calibration procedure, data acquisition, and analysis procedure.

Original languageEnglish
Title of host publicationProgress in Wall Turbulence: Understanding and Modeling
Subtitle of host publicationProceedings of the WALLTURB International Workshop held in Lille, France, April 21–23, 2009
EditorsMichel Stanislas, Javier Jimenez, Ivan Marusic
PublisherSpringer
Pages385-392
Number of pages8
ISBN (Electronic)9789048196036
ISBN (Print)9789048196029
DOIs
Publication statusPublished - 2011
EventInternational Workshop on Understanding and Modelling of Wall Turbulence, 2009 - Lille, France
Duration: 21 Apr 200923 Apr 2009

Publication series

NameERCOFTAC Series
PublisherSpringer Netherlands
Volume14
ISSN (Print)1382-4309
ISSN (Electronic)2215-1826

Conference

ConferenceInternational Workshop on Understanding and Modelling of Wall Turbulence, 2009
CountryFrance
CityLille
Period21/04/0923/04/09

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