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Mean and Turbulent Velocities for Plane Jet
Expressions for the lateral mean velocity, stream function, mean vorticity, and Reynolds stress in the zone of established flow of a two-dimensional jet have been obtained, based on a Gaussian, axial, mean velocity distribution. Mean and turbulent velocity measurements in a water jet have been carried out using Pitot tube and electromagnetic induction (Magnetohydrodynamic MHD) probes. Based upon the experimental evidence, the following conclusions are made: (1) The mean and turbulent velocity distributions are the same for air and water jets at the same Reynolds number and relative locations; (2) turbulence measurements, using the MHD method, yield the correct velocity distribution; however, the magnitudes must be corrected for the effects of current density terms; (3) the autocorrelation and spectral density functions exhibit two regions of differing character, corresponding to macro and micro turbulent, eddy scales; and (4) the macro length scale increases linearly and the microscale increases in a nonlinear manner with distance from the slot discharge.
Mean and Turbulent Velocities for Plane Jet
Expressions for the lateral mean velocity, stream function, mean vorticity, and Reynolds stress in the zone of established flow of a two-dimensional jet have been obtained, based on a Gaussian, axial, mean velocity distribution. Mean and turbulent velocity measurements in a water jet have been carried out using Pitot tube and electromagnetic induction (Magnetohydrodynamic MHD) probes. Based upon the experimental evidence, the following conclusions are made: (1) The mean and turbulent velocity distributions are the same for air and water jets at the same Reynolds number and relative locations; (2) turbulence measurements, using the MHD method, yield the correct velocity distribution; however, the magnitudes must be corrected for the effects of current density terms; (3) the autocorrelation and spectral density functions exhibit two regions of differing character, corresponding to macro and micro turbulent, eddy scales; and (4) the macro length scale increases linearly and the microscale increases in a nonlinear manner with distance from the slot discharge.
Mean and Turbulent Velocities for Plane Jet
Mih, Walter C. (author) / Hoopes, John A. (author)
Journal of the Hydraulics Division ; 98 ; 1275-1294
2021-01-01
201972-01-01 pages
Article (Journal)
Electronic Resource
Unknown
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