Turbulence modification by the clusters of settling particles in turbulent water flow in a horizontal duct

Hagiwara, Yoshimichi; Murata, Toru; Tanaka, Mitsuru; Fukawa, Takumi

doi:10.1016/s0032-5910(01)00502-2

Cited by 19 publications

(3 citation statements)

References 8 publications

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“…The work of Maeda et al17 and especially the comments made by Gore and Crowe14 are of particular interest in this study. To the authors' knowledge, the effect of particle aggregates (clusters) on turbulence intensity has received little attention to date, with only Hagiwara et al23 considering the effect of copper particle clusters on the near wall turbulence intensity. However, the choice of heavy particles in the present work provides an additional variable (sedimentation) which is not considered in other turbulence modulation studies.…”

Section: Introductionmentioning

confidence: 99%

Fine particle turbulence modulation

2010

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in Wiley Online Library (wileyonlinelibrary.com).Streamwise turbulence intensities of fine particulate suspensions were studied in a 26 mm N.B. horizontal pipe loop. Colloidal silica spheres were prepared in 10 À4 M and 1M KNO 3 solutions to control the degree of aggregate formation in the suspension. Using an ultrasonic Doppler velocity profiling sensor, the turbulence intensities of the fine particle suspensions were compared with those of a particle-free flow over a range of Reynolds numbers. At low electrolyte concentration, the silica particles remain dispersed, with the turbulence intensity of the suspension flow comparable with that of the particle-free flow. At high electrolyte concentration, increased particle-particle interaction leads to the formation of particle aggregates which support turbulence augmentation over a critical Reynolds number range. The range of Reynolds numbers over which this turbulence enhancement is observed is limited by both fluid dynamic effects at low Reynolds numbers (Re % 5500) and aggregate breakup at high Reynolds numbers (Re % 8000).

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Section: Introductionmentioning

confidence: 99%

Fine particle turbulence modulation

2010

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“…This trend of turbulence modification confirmed the conclusions of Gore & Crowe (1989). Hagiwara et al (2002) conducted simultaneous visualisation of depositing copper particles and fluorescent tracers in a turbulent water flow in a horizontal duct. They found that the rms of streamwise velocity fluctuations was decreased by vertically elongated clusters in the shear region close to the wall.…”

Section: Introductionmentioning

confidence: 99%

Fluid–particle correlated motion and turbulent energy transfer in a two-dimensional particle-laden shear flow

Horender

Hardalupas

2010

Chemical Engineering Science

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“…Another set of methods is based on optical discrimination. When each phase emits light at different wavelengths, a color camera can be used to discriminate the two phases by splitting the RGB channels (Hagiwara et al 2002). Otherwise, a dual set-up camera can be used.…”

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confidence: 99%