Concentration Profiles and Solids Transport above Stationary Deposit in Enclosed Conduit

Matoušek, Václav

doi:10.1061/(asce)hy.1943-7900.0000113

Cited by 36 publications

(43 citation statements)

References 11 publications

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“…Excellent agreement was found between the predictions of the simulation and an experimental dataset taken from the literature (Roco and Shook, 1985). Kaushal and Tomita (2013) modified an earlier model (Kaushal and Tomita, 2002a) and found excellent agreement with several earlier experimental studies (Gillies and Shook, 1994;Kaushal et al, 2005;Matoušek, 2009). …”

Section: Introductionsupporting

confidence: 76%

“…Therefore, the results at Re 25 000 and 50 000 can broadly be categorised as bed-forming and non-bed-forming, respectively. As noted earlier, there is a surprising scarcity of comparable concentration-profile data at low concentrations in the literature, and many of the data that are available are either at too high a concentration (Ekambara et al, 2009;Gillies et al, 2004;Karabelas, 1977;Kaushal and Tomita, 2002b), or were gathered in the presence of a thick bed (Matoušek, 2009;Pugh and Wilson, 1999). The reader is also referred to the studies listed in Table 1.…”

Section: Computed Particle Concentration Profilesmentioning

confidence: 99%

“…Such flows occupy the transition between dilute and concentrated flows, at which fluid-particle and inter-particle interactions -both collisional and hydrodynamicbegin to significantly influence the flow characteristics. Despite the industrial relevance of such flows, there is a scarcity of available data at low concentrations, although some exist at higher concentrations (Ekambara et al, 2009;Gillies et al, 2004;Karabelas, 1977;Kaushal and Tomita, 2002b) and in flows with a stationary bed component (Matoušek, 2009;Pugh and Wilson, 1999).…”

Section: Introductionmentioning

confidence: 99%

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Measurement of particle concentration in horizontal, multiphase pipe flow using acoustic methods: Limiting concentration and the effect of attenuation

Rice¹,

Fairweather²,

Peakall

et al. 2015

Chemical Engineering Science

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Measurement of particle concentration in horizontal, multiphase pipe flow using acoustic methods: limiting concentration and the effect of attenuation AbstractAn acoustic dual-frequency concentration inversion method, in which the backscattered acoustic signal received by transducers operating in the megahertz range is used to determine the concentration profile in suspensions of solid particles in a carrier fluid and which was originally developed for environmental applications, is applied to arbitrary suspensions of general engineering interest. Two spherical glass and two non-spherical plastic particle types with a range of size distributions and densities are used. Particle concentration profiles in horizontal turbulent pipe flow at Reynolds numbers of 25 000 and 50 000 -below and above the critical deposition velocity, respectively -and nominal concentrations of 0.5, 1 and 3 % by volume are presented for the four particle species, using measured backscattering and attenuation coefficients. In particular, the effects of particle size, density and flow rate on the transport and settling behaviour of suspensions are elucidated. The results demonstrate the potential of this method for measuring the degree of segregation in real suspensions and slurries across a range of challenging application areas, such as the nuclear and minerals processing industries. The limitations of the method are explored in detail through an analysis of the acoustic penetration depth and the application-specific maximum measurable concentration, both of which can be used to determine the most appropriate acoustic frequencies and measurement Highlights Marine model for measuring suspended solid fraction adapted for general use. Glass and plastic particles tested at several fractions in horizontal pipe flow.  Clear differences observed between species and settling and non-settling flows. Limiting concentration and penetration depth derived to inform future experiments. Method has potential for use in several engineering applications.

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Section: Introductionsupporting

confidence: 76%

Section: Computed Particle Concentration Profilesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Measurement of particle concentration in horizontal, multiphase pipe flow using acoustic methods: Limiting concentration and the effect of attenuation

Rice¹,

Fairweather²,

Peakall

et al. 2015

Chemical Engineering Science

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“…High-concentrated slurry flows are studied in natural channels [1][2][3][4], laboratory flumes [5][6], and pressurized pipes [7][8][9]. An internal structure of slurry flow is one of the key issues in research on the slurry flow behaviour.…”

Section: Introductionmentioning

confidence: 99%

Turbulent slurry flow measurement using ultrasonic Doppler method in rectangular pipe

Bareš

Krupička

Picek

et al. 2014

EPJ Web of Conferences

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Abstract. Distribution of velocity and Reynolds stress was measured using ultrasonic velocimetry in flows of water and Newtonian water-ballotini slurries in a pressurized Plexiglas pipe. Profiles of the measured parameters were sensed in the vertical plane at the centreline of a rectangular cross section of the pipe. Reference measurements in clear water produced expected symmetrical velocity profiles the shape of which was affected by secondary currents developed in the rectangular pipe. Slurry-flow experiments provided information on an effect of the concentration of solid grains on the internal structure of the flow. Strong attenuation of velocity fluctuations caused by a presence of grains was identified. The attenuation increased with the increasing local concentration of the grains.

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“…For heterogeneous and coarse-grained slurries the deposition velocity is a very important parameter; at least as importance as friction losses for design and operation (Matousek, 2009;Vlasak and Chara, 2004). The internal friction in the conveyed slurry and the friction between the conveyed material and the pipe produce a pressure drop, which determines the energy and pump technology requirements.…”

Section: Introductionmentioning

confidence: 99%

Flow Structure of Coarse-Grained Slurry in A Horizontal Pipe

Vlasák¹,

Kysela²,

Chára³

2012

Journal of Hydrology and Hydromechanics

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The flow behaviour of coarse-grained slurry depends on particle size, shape, density and concentration, and on the density and rheological properties of the carrier liquid. The present paper describes the results of an experimental investigation and flow visualisation of model coarse-grained particle-water mixtures in a closed pipe loop with smooth stainless steel pipes of inner diameter 36 mm. Glass balls and washed graded pebble gravel of mean diameter d 50 = 6 mm were used as model coarse-grained material. The effect of slurry velocity and particle concentration on the slurry flow behaviour and pressure drop in the turbulent regime was evaluated. Particle distribution in the pipe cross-section and motion of particles along the pipe invert, particle saltation and particle conveying in the carrier liquid were investigated in a transparent pipe viewing section and motion of individual particles was described. Velocity profiles of the carrier liquid and conveyed particles were determined. Tokové chování hrubozrnných suspenzí závisí na velikosti, tvaru a hustotě částic, koncentraci pevné fáze a hustotě a reologických vlastnostech nosné kapaliny. Článek popisuje výsledky experimentálního výzkumu a vizualizace proudění modelové hrubozrnné suspenze v experimentální potrubní lince s hladkým nerezovým potrubím s vnitřním průměrem 36 mm. Skleněné kuličky a praný oblý štěrk (kačírek) se středním zrnem d 50 = 6 mm byly použity jako modelový materiál. Byl vyhodnocen vliv rychlosti proudění suspenze a koncentrace pevné fáze na chování a tlakové ztráty suspenze. Rozdělení částic v příčném průřezu potrubí a pohyb částic podél dna potrubí, jejich saltace a unášení v nosné kapalině byly zkoumány v transparentní části potrubí a byl popsán pohyb jednotlivých částic a pro vybrané případy byly stanoveny rychlostní profily nosné kapaliny a unášených částic.KLÍČOVÁ SLOVA: hrubozrnné suspenze, turbulentní proudění, tlakové ztráty, rozdělení rychlostí, struktura proudu, vliv koncentrace.

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Concentration Profiles and Solids Transport above Stationary Deposit in Enclosed Conduit

Cited by 36 publications

References 11 publications

Measurement of particle concentration in horizontal, multiphase pipe flow using acoustic methods: Limiting concentration and the effect of attenuation

Measurement of particle concentration in horizontal, multiphase pipe flow using acoustic methods: Limiting concentration and the effect of attenuation

Turbulent slurry flow measurement using ultrasonic Doppler method in rectangular pipe

Flow Structure of Coarse-Grained Slurry in A Horizontal Pipe

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