A plane turbulent wall jet on a fully rough surface

Tang, Z.; Bergstrom, Donald J.; Bugg, J. D.

doi:10.1016/j.ijheatfluidflow.2017.04.014

Cited by 15 publications

(2 citation statements)

References 12 publications

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“…10 that shows the streamwise variation of the nondimensional jet half-width 1/b. It is pertinent to mention that unlike the cases of submerged wall jets on smooth, sandy-rough and fully-rough boundaries [24,28,33,36,39], the thickening rate in the present case is faster, because of its higher gradient than other cases. Besides, unlike the other studies the variation of 1/b with x/b is not linear all throughout owing to the higher resistance to the flow from the macro-rough boundary.…”

Section: Similarity In Time-averaged Streamwise Velocity Distributionsmentioning

confidence: 58%

“…They reported an apparent change in the time-averaged velocity distribution in a wall jet and a substantial increase in the skin friction coefficient on the rough boundary. Tang et al [32,33] revealed that the wall jet consists of inner and outer layers, which follow different scaling laws leading to two self-similarities in timeaveraged velocity distributions. Besides, the boundary roughness modifies the development of the time-averaged velocity distributions in inner and outer layers, although the effect on the outer layer is minimal.…”

Section: Introductionmentioning

confidence: 99%

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Submerged wall jet on a macro-rough boundary: turbulent flow characteristics and their scaling laws

Chowdhury,

Sen,

Dey

2023

Environ Fluid Mech

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This study presents the turbulence characteristics and the scaling laws in a horizontal submerged wall jet on an array of hemispherical macro-rough elements forming an open-channel boundary.The flow field was measured by an acoustic Doppler system, called Vectrino. The turbulence characteristics on a macro-rough boundary, being different from those on smooth boundary, are discussed from the perspective of decay of the local-peak parameters, similarity, and growth of the length scales. The vector plots, streamwise velocity flow field, and the jet velocity variations show that the decay rate of jet velocity in a submerged jet on a macro-rough boundary is initially sharp and then gradually drops down to become independent of streamwise distance. The growth rate of the jet boundary layer thickness is initially slow and then becomes fast as it tends to reach the free surface. On the other hand, the plots of the Reynolds shear stress and turbulence intensities, and the variations of their local-peak magnitudes reveal the gradual damping of these parameters with the streamwise distance. These results encapsulate the recovery of a submerged jet on a macrorough boundary to become an open channel flow. The most important outcome is that the streamwise velocity, Reynolds shear stress, and turbulence intensities in the fully developed zone are found to be self-similar when the velocity is scaled with the local-peak velocity against jet halfwidth, and the Reynolds shear stress and turbulence intensities are scaled with their respective local-peak magnitudes against half-width of Reynolds shear stress. The boundary shear stress diminishes with an increase in streamwise distance.

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Section: Similarity In Time-averaged Streamwise Velocity Distributionsmentioning

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Submerged wall jet on a macro-rough boundary: turbulent flow characteristics and their scaling laws

Chowdhury,

Sen,

Dey

2023

Environ Fluid Mech

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An Experimental Study of a Steady Plane Wall Jet with Different Reynolds Numbers, Coflow Stream and Surface Conditions

et al. 2023

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Experimental study on the scour due to a water jet subjected to lateral confinement

Martino

Ciani

Paterson

et al. 2019

European Journal of Mechanics - B/Fluids

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The effect of lateral confinement due to very close side walls, on erosion caused by a water jet issuing from a rectangular sluice aperture, has been studied experimentally in a narrow laboratory flume. Velocimetry (PIV) in presence of a smooth, no erodible bottom, revealed self-similar velocity profiles with the structure of a wall jet, but upward-shifted with respect to the classical two-dimensional profile. The classical definition of the Shields number was modified, to include the influence of the relative roughness and the inlet aspect ratio. This last coefficient was also relevant in the definition of a suitable length scale to account for the effect of the lateral confinement. Scour patterns in the narrow flume have also shown differences with respect to erosion by two-dimensional wall jets: the downstream mound undergoes a morphological transition, from triangular to trapezoidal, at the early stage of the scour development, and grains move downhill driven by gravity inside the granular wedge, in a regime of steady recirculation (SR). Above this regime, a digging-refilling (DR) cycle, with periods of the order of seconds, triggers at a well-defined Shields number.

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A plane turbulent wall jet on a fully rough surface

Cited by 15 publications

References 12 publications

Submerged wall jet on a macro-rough boundary: turbulent flow characteristics and their scaling laws

Submerged wall jet on a macro-rough boundary: turbulent flow characteristics and their scaling laws

An Experimental Study of a Steady Plane Wall Jet with Different Reynolds Numbers, Coflow Stream and Surface Conditions

Experimental study on the scour due to a water jet subjected to lateral confinement

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