A Critical Analysis of Transverse Vorticity Measurements in a Large Plane Shear Layer
A four-wire array of (hot-wire) probes, configured to measure the transverse vorticity (ωz) in a turbulent shear flow (ū = ū(x,y)) has been described in a series of publications: FOSS [1,2,3]; FOSS, et.al.  provides the most recent description of the probe, the computing algorithms, and representative results. Considering the conceptual and the computational importance of vorticity, the relative paucity of methods for its direct measurement is considered to represent the difficulty of the task and not the inherent interest in the results of such measurements. Companion papers in the present volume include a presentation of vorticity measurements in MHD flows: Tsinober, et.al., and some quite interesting results of vorticity/velocity measurements in a turbulent boundary layer by Balint, et.al. The latter continues the efforts by Wallace and co-workers to utilize a 9 wire probe of exceptionally small dimensions. A general review of vorticity measurements is provided by WALLACE .
KeywordsShear Layer Transverse Velocity Array Wire Parallel Array Turbulent Shear Flow
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- 2.Foss, J.F., “Transverse vorticity measurements” (an invited paper) Dynamic Flow Conference ‘78, The Disa Corp. Skovlunde Denmark, 1979.Google Scholar
- 3.Foss, J.F., “Advanced Techniques for Transverse Vorticity Measurements,” 1981, 7th Biennial Symp. on Turb., Rola, MO, Sept.Google Scholar
- 4.Foss, J.F., Klewicki, C.L., Disimile, P.J., “Transverse Vorticity Measurements Using An Array of Four Hot-Wire Probes,” NASA C.R. 178098, Langley Res. Center, May 1986.Google Scholar
- 6.Lang, D.B. and Dimotakís, P., “Measuring Vorticity Using the Laser Doppler Velocimeter,” Bull. Am. Phys. Soc., Vol. 27, p. 1166, 1984.Google Scholar
- 7.Lang, D.B., “Laser Doppler Velocity and Vorticity Measurements in Turbulent Shear Layers,” Ph.D. Thesis, California Institute of Technology, 1985.Google Scholar