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Research Papers: Fundamental Issues and Canonical Flows

Flow Structure in the Near-Wall Region of a Submerged Impinging Jet

[+] Author and Article Information
Khaled J. Hammad1

Engineering Department  Central Connecticut State University 1615 Stanley Street New Britain, CT 06050hammad@ccsu.edu

Ivana Milanovic

Department of Mechanical Engineering  University of Hartford West Hartford, CT 06117, USAmilanovic@hartford.edu

1

Formerly with Dantec Dynamics, Holtsville, New York.

J. Fluids Eng 133(9), 091205 (Sep 15, 2011) (9 pages) doi:10.1115/1.4004907 History: Received January 01, 2011; Revised August 14, 2011; Published September 15, 2011; Online September 15, 2011

An experimental investigation was performed to study the flow structure of a submerged water jet impinging normally on a smooth and flat surface using particle image velocimetry (PIV). The jet issued from a 112 diameter long pipe which ensured fully developed turbulent flow conditions at the outlet. A semiconfined setting provided properly characterized flow boundary conditions. The Reynolds number based on jet mean exit velocity was Re = 15,895. The pipe-to-plate separation was varied between 1 and 8 pipe diameters. The current study focused on characterizing the flow structure close to the pipe outlet, in the impingement and wall-jet regions. Statistically averaged mean and RMS velocities are reported for a 6D wide and 1D high, near-plate, rectangular region.

Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Impinging jet schematic

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Figure 2

Experimental setup

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Figure 3

Test section schematic

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Figure 4

The radial profiles of axial velocity Uz /Uc obtained 0.3D away from the outlet at given separation distances H/D

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Figure 5

Comparison between Uz /Uc , obtained 0.3D away from the outlet for given separation distances H/D and power law

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Figure 6

The radial profiles of RMS velocities ur,rms and uz,rms 0.3D away from the outlet for given separation distances H/D

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Figure 7

The radial profiles of RMS velocities ur,rms and uz,rms 1D away from the outlet for given separation distances H/D

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Figure 8

Mean velocity magnitude plots for H/D = 1–8

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Figure 9

Mean axial velocity Uz /Uc decay along stagnation line for given separation distances H/D

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Figure 10

Mean radial velocity profiles at different axial distances from the impingement plate

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Figure 11

Mean axial velocity profiles at different axial distances from the impingement plate

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Figure 12

Mean radial velocity profiles at different radial locations from the centerline

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Figure 13

Mean axial velocity profiles at different radial locations from the centerline

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Figure 14

Radial RMS velocity plots for H/D = 1–8

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Figure 15

Axial RMS velocity plots for H/D = 1–8

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Figure 16

Radial profiles of radial RMS velocity for given z/D stations

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Figure 17

Radial profiles of axial RMS velocity for given z/D stations

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