A scanning PIV method for fine-scale turbulence measurements
A scanning PIV method for fine-scale turbulence measurements
A hybrid technique is presented that combines scanning PIV with tomographic reconstruction to make spatially and temporally resolved measurements of the fine-scale motions in turbulent flows. The technique uses one or two high-speed cameras to record particle images as a laser sheet is rapidly traversed across a measurement volume. This is combined with a fast method for tomographic reconstruction of the particle field for use in conjunction with PIV cross-correlation. The method was tested numerically using DNS data and with experiments in a large mixing tank that produces axisymmetric homogeneous turbulence at Rλ≃219. A parametric investigation identifies the important parameters for a scanning PIV set-up and provides guidance to the interested experimentalist in achieving the best accuracy. Optimal sheet spacings and thicknesses are reported, and it was found that accurate results could be obtained at quite low scanning speeds. The two-camera method is the most robust to noise, permitting accurate measurements of the velocity gradients and direct determination of the dissipation rate.
Lawson, John M.
4e0b1895-51c5-41e6-9322-7f79e76e0e4c
Dawson, James R.
3dbd6c72-4af6-462d-aea3-11659ac6f095
19 November 2014
Lawson, John M.
4e0b1895-51c5-41e6-9322-7f79e76e0e4c
Dawson, James R.
3dbd6c72-4af6-462d-aea3-11659ac6f095
Lawson, John M. and Dawson, James R.
(2014)
A scanning PIV method for fine-scale turbulence measurements.
Experiments in Fluids, 55 (12), [1857].
(doi:10.1007/s00348-014-1857-7).
Abstract
A hybrid technique is presented that combines scanning PIV with tomographic reconstruction to make spatially and temporally resolved measurements of the fine-scale motions in turbulent flows. The technique uses one or two high-speed cameras to record particle images as a laser sheet is rapidly traversed across a measurement volume. This is combined with a fast method for tomographic reconstruction of the particle field for use in conjunction with PIV cross-correlation. The method was tested numerically using DNS data and with experiments in a large mixing tank that produces axisymmetric homogeneous turbulence at Rλ≃219. A parametric investigation identifies the important parameters for a scanning PIV set-up and provides guidance to the interested experimentalist in achieving the best accuracy. Optimal sheet spacings and thicknesses are reported, and it was found that accurate results could be obtained at quite low scanning speeds. The two-camera method is the most robust to noise, permitting accurate measurements of the velocity gradients and direct determination of the dissipation rate.
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Published date: 19 November 2014
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Local EPrints ID: 455321
URI: http://eprints.soton.ac.uk/id/eprint/455321
ISSN: 0723-4864
PURE UUID: 0c39f080-3bf3-4b95-ac94-a47660c221c1
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Date deposited: 16 Mar 2022 18:08
Last modified: 06 Jun 2024 02:04
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Author:
James R. Dawson
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