Experimental investigation of the grid-generated turbulence features in a free surface flow

Murzyn, Frédéric; Bélorgey, Michel

doi:10.1016/j.expthermflusci.2005.02.002

Cited by 21 publications

(19 citation statements)

References 20 publications

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“…Schematics of the experimental setup and test rig with PIV equipment are shown in Figure 1a,b. As previous studies with similar test condition and flow regime show [19], the flow in main flow region around mid-depth of the channel far downstream of the obstacle is generally homogeneous in water depth direction. In this work, honeycombs and wave-breaking plates were installed at the tunnel entrance far enough (about 10 m) upstream of the test section to ensure a vertically uniform base flow away from boundaries without grid more certainly [25,26].…”

Section: Experimental Facilitysupporting

confidence: 73%

“…The distribution and value of velocity, turbulence intensity, integral scale and space-time correlation are presented in detail to reveal the transition properties of flow and turbulence distribution, which would be beneficial to the engineering determination of the channel dimension and configuration of the downstream filter device. As the distributions for both mean and fluctuating velocities x/M > 20 have shown few changes in the open water channel [19] (similar to the current case), the results in this paper are also useful to infer the flow distribution at a farther downstream distance. The flow diversity in water depth direction due to the influence of free surface and flow structures from the turbulence boundary layer (TBL) of the channel bottom is also analyzed, which is important for sediment transport.…”

Section: Introductionsupporting

confidence: 65%

“…Previous researchers have given less consideration to this kind of flow with a liquid surface, which is a common scenario in real engineering. Only Murzyn and Bélorgey [18,19] investigated the grid-generated turbulence feature in a wave/current flume and the influence of free surface on the turbulence scale at the range of x/M > 15. In his study, the Taylor hypothesis was regarded as valid at 15 < x/M < 60 and the macro length scale was revealed to be mainly imposed by the grid mesh dimension, rather than the mean velocity.…”

Section: Introductionmentioning

confidence: 99%

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PIV Study on Grid-Generated Turbulence in a Free Surface Flow

Yao

Cao

et al. 2021

Water

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To investigate the feature of turbulence developing behind the filter device in a current flow, the flow fields at intermediate downstream distance of an immersed grid in an open water channel are recorded using a two-dimensional (2D) Particle Image Velocimetry (PIV) system. The measurements on a series of vertical and horizontal sections are conducted to reveal the stream-wise evolution and depth diversity of grid turbulence in the free surface flow. Unlike the previous experiments by Laser Doppler Velocimetry (LDV) and Hot-Wire Anemometry (HWA), the integral scales and space-time correlations are estimated without using the Taylor hypothesis in this paper. The distributions of mean velocity, turbulence intensity and integral scale show the transition behavior of grid-generated flow from perturbations to fully merged homogenous turbulence. The distributions of velocity and turbulence intensity become more uniform with increasing distance. While the spatial divergence of integral scale becomes more pronounced as the flow structures develop downstream. The vertical distributions of flow parameters reveal the diversity of flow characteristics in the water depth direction influenced by free surface and the outer part of turbulence boundary layer (TBL) from the channel bottom. The applicability of the newly proposed two-order elliptic approximation model for the space-time correlations of the decaying grid turbulence in channel flow is verified at different positions. The calculated convection velocity for large-scale motion and sweep velocity for small-scale motion based on this model bring a new insight into the dynamic pattern of this type of flow.

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Section: Experimental Facilitysupporting

confidence: 73%

Section: Introductionsupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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PIV Study on Grid-Generated Turbulence in a Free Surface Flow

Yao

Cao

et al. 2021

Water

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“…The classical approach to generate turbulence in the laboratory is the so-called grid method [1][2][3][4][5], in which fluid flow is forced through a mesh grid to generate turbulence. The main feature of grid turbulence is that it produces single-length turbulence scales at any instant.…”

Section: Introductionmentioning

confidence: 99%

Fractality in Turbulence

Salim

Nicolleau

2011

ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D

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Fractality is, as we introduce it, an attribute relating to any object or system where the existence of self-similar replication of the whole is present in any order and scale. This can be realized in any turbulent flow due to the self-similar flow structures in its energy cascade. This intrinsic natural fractality is dominant in any turbulence energy cascade. In this paper, we report how this natural fractality is affected by a forced fractality externally superimposed on turbulent flow in a circular wind tunnel. The forced fractality was created by a fractal orifice plate. The time correlation and energy spectra showed that the forced fractality excites the natural fractality significantly and increases flow mixing. Simultaneously, we found that the fractal orifice plate is much more efficient than the classical orifice plate with equal flow area in terms of the flow mixing and deemed to be a better orifice flow meter than its classical counterpart.

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“…The hydrodynamics of these turbulent flows are similar, however. It has been well established that turbulence in a stationary grid is driven by the mean flow which decays by a power law (Murzyn and Bélorgey 2005), but an oscillating grid generates zero-mean turbulence (Hwang and Eaton 2004). There are also differences in the functional relationships that describe turbulence parameters.…”

Section: Introductionmentioning

confidence: 99%

Effect of turbulence on hollow fiber membrane filtration in multiphase reactors

Pourbozorg¹

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Experimental investigation of the grid-generated turbulence features in a free surface flow

Cited by 21 publications

References 20 publications

PIV Study on Grid-Generated Turbulence in a Free Surface Flow

PIV Study on Grid-Generated Turbulence in a Free Surface Flow

Fractality in Turbulence

Effect of turbulence on hollow fiber membrane filtration in multiphase reactors

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