Investigation of Coherent Vortices in Partly Vegetated Open-channel Flows with a Particle-Image Velocimetry

Investigation of Coherent Vortices in Partly Vegetated Open-channel Flows with a Particle-Image Velocimetry

In this study, images of very small 75μm diameter particles uniformly scattered in vegetated open-channel flows were taken using a CCD camera and 2W Argon-Ion laser light sheet. Instantaneous velocities at manypoints in the laser slit plane were obtained from these continuous two images of particles...

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Veröffentlicht in:Journal of applied mechanics 1998/08/26, Vol.1, pp.719-728
Hauptverfasser: NEZU, Iehisa, ONITSUKA, Kouki, JOHMEN, Hideki, SAGARA, Yuki, IKETANI, Kazuya
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Sprache:eng
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laser light sheet
Particle-Image Velocimetry
particles
vegetated open-channel flows
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container_issue
container_start_page 719
container_title Journal of applied mechanics
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creator NEZU, Iehisa
ONITSUKA, Kouki
JOHMEN, Hideki
SAGARA, Yuki
IKETANI, Kazuya
description In this study, images of very small 75μm diameter particles uniformly scattered in vegetated open-channel flows were taken using a CCD camera and 2W Argon-Ion laser light sheet. Instantaneous velocities at manypoints in the laser slit plane were obtained from these continuous two images of particles. This new method iscalled the “Particle-Image Velocimetry (PIV)”, and seems to be very powerful to investigate coherent vortices inspace and time, because simultaneous velocities at every point can be obtained easily. It was found that thedensity of vegetation affects on turbulent structures such as instantaneous vectors and vorticities.
doi_str_mv 10.2208/journalam.1.719
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subjects laser light sheet
Particle-Image Velocimetry
particles
vegetated open-channel flows
title Investigation of Coherent Vortices in Partly Vegetated Open-channel Flows with a Particle-Image Velocimetry
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