Abstract
The velocity field of a circular water jet impinging onto a flat plate has been measured using particle image velocimetry, or PIV. The velocity field has been recorded at several instants 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 the jet flow, which reveals 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. The structure found in these experiments may be similar to the ground level structure of atmospheric microburst phenomena.
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References
Adrian, R. J. 1986: An image shifting technique to resolve directional ambiguity in double-pulsed laser velocimetry. Appl. Opt. 25, 3855–3858
Adrian, R. J. 1988: Statistical properties of particle image velocimetry measurements in turbulent flow. In: Laser anemometry in fluid mechanics, (eds. Adrian, R. J.; Durão, D. F. G.; Durst, F.; Whitelaw, J. H.). Vol. 3, pp. 115–129. Lisbon: Ladoan-Instituto Superior Tecnico
Adrian, R. J.; Yao, C. S. 1983: Development of pulsed laser velocimetry for measurement of fluid flow. In: Proc. 8th sym. on turbulence, pp. 170–186. Rolla: University of Missouri
Cerra, A. W.; Smith, C. R. 1980: Experimental observation of the interaction of a vortex ring with a flat plate. Bull. Amer. Phys. Soc. 25, 1092
Didden, N.; Ho, C. M. 1985: Unsteady separation in a boundary layer produced by an impinging jet. J. Fluid Mech. 160, 235–256
Donaldson, C.; Snedeker, R. S. 1971: A study of free jet impingement. Part 1. Mean properties of free and impinging jets. J. Fluid Mech. 45, 281–319
Donaldson, C.; Snedeker, R. S.; Margolis, D. P. 1971: A study of free jet impingement. Part 2. Free jet turbulent structure and impingement heat transfer. J. Fluid Mech. 45, 477–512
Droegenmeier, J. K.; Davies-Jones, R. P. 1987: Simulation of thunderstorm microbursts with a supercompressible numerical model. In: Proc. 5th int. conf. on numerical methods in laminar and turbulent flow. Montreal, Quebec
Dudderar, T. D.; Simpkins, P. G. 1977: Laser speckle photography in a fluid medium. Nature 270, 45–47
Fujita, T. T. 1977: An analysis of three weather-related aircraft accidents. Bull. Amer. Meteor. Soc. 58, 1164–1181
Fujita, T. T. 1985: The downburst. Satellite and mesometeorology research project. University of Chicago
Grobel, M.; Merzkirch, W. 1987: Measurement of natural convection by speckle velocimetry. Proc. int. conf. on optical methods in flow and particle diagnostics, pp. 97–99: Orlando: Laser Inst.
Harvey, J. K.; Perry, F. J. 1971: Flow field produced by trailing vortices in the vicinity of the ground. AIAA J. 9, 1659–1660
Ho, C. M.; Nosseir, N. S. 1980: Large coherent structures in an impinging turbulent jet. In: Turbulent shear flows, (eds. Bradbury, L. J. S.; Durst, F.; Launder, B. E.; Schmidt, F. W.; Whitelaw, J. H.). Vol. 2, p. 297. Berlin, Heidelberg, New York: Springer
Ho, C. M.; Nosseir, N. S. 1981: Dynamics of an impinging jet. Part 1. The feedback phenomenon. J. Fluid Mech. 105, 119–142
Landreth, C. C.; Adrian, R. J. 1988: Measurement and refinement of velocity data using high image density analysis in particle image velocimetry. In: Proc. 4th int. sym. applications of laser anemometry to fluid mechanics. Sect. 6.14. Lisbon
Landreth, C. C.; Adrian, R. J.; Yao, C. S. 1988: Double pulsed particle image velocimeter with directional resolution for complex flows. Exp. Fluids 6, 119–128
Liang, S.; Falco, R. E.; Bartholomew, R. W. 1983: Vortex ring/ moving wall interactions: experiments and numerical modelling. Bull. Amer. Phys. Soc. 28, 1397
Lourenco, L. M.; Krothapalli, A. 1988: Application of PIDV to the study of the temporal evolution of the flow past a cylinder. In: Laser anemometry in fluid mechanics, (eds.) Adrian, R. J.; Durão, D. F. G.; Durst, F.; Whitelaw, J. H.). Vol. 3, pp. 115–129. Lisbon: Ladoan-Instituto Superior Tecnico
Meynart, R. 1983: Speckle velocimetry study of vortex pairing in a low-Re unexcited jet. Phys. Fluids 26, 2074–2079
Nelson, E. S. 1987: Phase-averaged measurements of vortex interaction with a solid surface and the breakaway process. M.S. thesis. Chicago: Illinois Institute of Technology
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Landreth, C.C., Adrian, R.J. Impingement of a low Reynolds number turbulent circular jet onto a flat plate at normal incidence. Experiments in Fluids 9, 74–84 (1990). https://doi.org/10.1007/BF00575338
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DOI: https://doi.org/10.1007/BF00575338