A plane water jet issuing into quiescent air at a Reynolds number of 2.5 × 105 is experimentally studied using phase Doppler anemometry (PDA). The plane water jet contains a coherent central region, which is situated immediately downstream of the nozzle exit. Particular emphasis is placed upon the distinctive attributes of such a region. Both mean flow pattern and turbulent features are obtained statistically based upon instantaneous velocity data. The central region is overwhelmingly dominated by uniformly distributed velocity, and remarkably high velocity gradient is present near the boundary of this region. Evidence shows that self-preservation is not satisfied in the central region. Explicit energy dissipation mechanisms in the central region are appreciated from cross-sectional uniform distributions of Kolmogorov length scales. Turbulent kinetic energy increases as the plane jet progresses, which is opposite to the general tendency associated with self-preservation. Although the central region is filled with near-zero Reynolds shear stress, distributions of skewness and flatness in this region are non-Gaussian and the instability caused by small-scale flow structures is thereby substantiated.
Turbulent Features in the Coherent Central Region of a Plane Water Jet Issuing Into Quiescent Air
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received October 21, 2013; final manuscript received February 18, 2014; published online May 19, 2014. Assoc. Editor: Mark F. Tachie.
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Kang, C., and Liu, H. (May 19, 2014). "Turbulent Features in the Coherent Central Region of a Plane Water Jet Issuing Into Quiescent Air." ASME. J. Fluids Eng. August 2014; 136(8): 081205. https://doi.org/10.1115/1.4026924
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