Predicting the deposit velocity for horizontal turbulent pipe flow of slurries

Thomas, A. D.

doi:10.1016/0301-9322(79)90040-5

Cited by 46 publications

(50 citation statements)

References 3 publications

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“…Data points above the DHLLDV curve are in general for pipe diameters smaller than 0.1524 m. Some special attention is given to the relation between the Durand Froude F L number and the pipe diameter D p . Both Thomas (1979) and Wasp et al (1977) carried out research with a d = 0.18 mm particle in 6 pipe diameters, see Fig. 2.…”

Section: Experimental Datamentioning

confidence: 99%

“…The particle diameter d: The LDV has a lower limit for very small particles, after which it increases to a maximum at a particle diameter of about d = 0.5 mm (Thomas (1979), Thomas (2014), Durand and Condolios (1952), Gillies (1993) and Poloski et al (2010)). For medium sized particles with a particle size d > 0.5 mm, the F L value decreases to a minimum for a particle size of about d = 2 mm (Durand and Condolios, 1952;Gillies, 1993;Poloski et al, 2010).…”

Section: Conclusion Literaturementioning

confidence: 99%

“…The data points of the very small particle diameters, Thomas (1979) and Poloski (2010), were carried out in very small to medium diameter pipes, while the two curves are constructed for a 0.1524 (6 inch) pipe, resulting in slightly lower curves. Data points above the DHLLDV curve are in general for pipe diameters smaller than 0.1524 m. Some special attention is given to the relation between the Durand Froude F L number and the pipe diameter D p .…”

Section: Experimental Datamentioning

confidence: 99%

“…The pipe diameter D p : The LDV is proportional to the pipe diameter D p to a power between 1/3 and 1/2 (about 0.4) for small to large particles (Thomas (1979), Wasp et al (1977), Lahiri (2009) and Jufin and Lopatin (1966)) and a power of about 0.1 for very small particles (Thomas (1979), Wilson and Judge (1976), Sanders et al (2004) and Poloski et al (2010)). …”

Section: Conclusion Literaturementioning

confidence: 99%

“…Because there are numerous data and equations for the critical velocity (LSDV, LDV or MHGV), some equations based on physics, but most based on curve fitting, a selection is made of the equations and methods from literature. The literature analysed are from Wilson (1942), Durand and Condolios (1952), Newitt et al (1955), Jufin and Lopatin (1966), Zandi and Govatos (1967), Charles (1970), Graf et al (1970), Wilson and Judge (1976), Wasp et al (1977), Wilson and Judge (1977), Thomas (1979), Oroskar and Turian (1980), Parzonka et al (1981), Turian et al (1987), Davies (1987), Schiller and Herbich (1991), Gogus and Kokpinar (1993), Gillies (1993), Berg (1998), Kokpinar and Gogus (2001), Shook et al (2002), Wasp and Slatter (2004), Sanders et al (2004), Lahiri (2009), Poloski et al (2010) and Souza Pinto et al (2014.…”

Section: Introductionmentioning

confidence: 99%

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The Limit Deposit Velocity model, a new approach

Miedema

Ramsdell

2015

Journal of Hydrology and Hydromechanics

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Abstract:In slurry transport of settling slurries in Newtonian fluids, it is often stated that one should apply a line speed above a critical velocity, because blow this critical velocity there is the danger of plugging the line. There are many definitions and names for this critical velocity. It is referred to as the velocity where a bed starts sliding or the velocity above which there is no stationary bed or sliding bed. Others use the velocity where the hydraulic gradient is at a minimum, because of the minimum energy consumption. Most models from literature are one term one equation models, based on the idea that the critical velocity can be explained that way.Here the following definition is used: The critical velocity is the line speed below which there may be either a stationary bed or a sliding bed, depending on the particle diameter and the pipe diameter, but above which no bed (stationary or sliding) exists, the Limit Deposit Velocity (LDV). The way of determining the LDV depends on the particle size, where 5 regions are distinguished.These regions for sand and gravel are roughly; very small particles up to 0.014-0.040 mm (d < δ v ), small particles from δ v -0.2 mm, medium particles in a transition region from 0.2-2.00 mm, large particles > 2 mm and very large particles > 0.015·D p . The lower limit of the LDV is the transition between a sliding bed and heterogeneous transport. The new model is partly based on physics and correlates well with experiments from literature.

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Section: Experimental Datamentioning

confidence: 99%

Section: Conclusion Literaturementioning

confidence: 99%

Section: Experimental Datamentioning

confidence: 99%

Section: Conclusion Literaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Limit Deposit Velocity model, a new approach

Miedema

Ramsdell

2015

Journal of Hydrology and Hydromechanics

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Experimental and numerical investigation of particle transport in a horizontal pipe

2005

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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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Predicting the deposit velocity for horizontal turbulent pipe flow of slurries

Cited by 46 publications

References 3 publications

The Limit Deposit Velocity model, a new approach

The Limit Deposit Velocity model, a new approach

Experimental and numerical investigation of particle transport in a horizontal pipe

Fine particle turbulence modulation

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