Impingement of a low Reynolds number turbulent circular jet onto a flat plate at normal incidence.

C. C. Landreth, Ronald Adrian

Research output: Contribution to journalArticle

Abstract

The velocity field of a circular water jet impinging onto a flat plate was measured using particle image velocimetry, or PIV. The veocity field was recorded at several instances in time, producing thousands of simultaneous two dimensional velocity measurements for each realization. The instantaneous velocity, vorticity and rate of strain fields reveal the interaction of vortices near the impinging wall within the radial wall jet downstream from the stagnation point. An ensemble average of the instantaneous fields produces a mean velocity field of a jet flow, which revealed many of the processes leading to boundary layer separation and vortex breakaway within the wall jet. The PIV system extracts the velocity measurements using a two dimensional autocorrelation method, and can obtain thousands of highly accurate velocity measurements within a few minutes.

Original languageEnglish (US)
Journal[No source information available]
StatePublished - Jan 1 1988
Externally publishedYes

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Rheology
Velocity measurement
Reynolds number
Water
Incidence
Vortex flow
Vorticity
Autocorrelation
Boundary layers

ASJC Scopus subject areas

  • Engineering(all)

Cite this

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N2 - The velocity field of a circular water jet impinging onto a flat plate was measured using particle image velocimetry, or PIV. The veocity field was recorded at several instances in time, producing thousands of simultaneous two dimensional velocity measurements for each realization. The instantaneous velocity, vorticity and rate of strain fields reveal the interaction of vortices near the impinging wall within the radial wall jet downstream from the stagnation point. An ensemble average of the instantaneous fields produces a mean velocity field of a jet flow, which revealed many of the processes leading to boundary layer separation and vortex breakaway within the wall jet. The PIV system extracts the velocity measurements using a two dimensional autocorrelation method, and can obtain thousands of highly accurate velocity measurements within a few minutes.

AB - The velocity field of a circular water jet impinging onto a flat plate was measured using particle image velocimetry, or PIV. The veocity field was recorded at several instances in time, producing thousands of simultaneous two dimensional velocity measurements for each realization. The instantaneous velocity, vorticity and rate of strain fields reveal the interaction of vortices near the impinging wall within the radial wall jet downstream from the stagnation point. An ensemble average of the instantaneous fields produces a mean velocity field of a jet flow, which revealed many of the processes leading to boundary layer separation and vortex breakaway within the wall jet. The PIV system extracts the velocity measurements using a two dimensional autocorrelation method, and can obtain thousands of highly accurate velocity measurements within a few minutes.

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