Coal slurry diagnostics by ultrasound transmission

Davis, Mike

doi:10.1121/1.382014

Cited by 48 publications

(11 citation statements)

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“…Some examples are lubricants, ceramics, pharmaceuticals, and foods, and ultrasonics offers a possible means of monitoring their dispersed phase parameters and colloidal states. The validity of a number of models of acoustic propagation has been investigated in colloidal systems with industrial applications; for example, Davis applied the theory of Allegra and Hawley to coal slurries, McClements and Povey compared the same theory to emulsions of relevance to the food industry, and Harker et al applied a hydrodynamic model to measurements on waste slurries . However, neither of these models incorporates the effects of interparticle forces.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic Wave Propagation in Silica Sols and Gels

Holmes

Challis

1999

Langmuir

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Acoustic attenuation and phase velocity in the frequency range 2-50 MHz have been measured in a series of silica sols and gels with different ionic strengths, to investigate the effect of interparticle forces on acoustic propagation. While sols and gels at the same concentration but at different ionic strengths have widely differing viscosities, no significant differences were found in the acoustic properties. By comparison with previously published work on neutron scattering in silica sols and gels, this suggests that ultrasonic propagation in these colloids is not sensitive to interparticle forces. LA981391M

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Section: Introductionmentioning

confidence: 99%

Ultrasonic Wave Propagation in Silica Sols and Gels

Holmes

Challis

1999

Langmuir

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“…; (4) where N is the number of pores and B is the permeability which is given by the Kozeny-Carman equation as 18…”

Section: A Internal Flow Modelsmentioning

confidence: 99%

Effective viscosity in a wave propagation model for ultrasonic particle sizing in non-dilute suspensions

Al-Lashi

Challis

2014

The Journal of the Acoustical Society of America

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Estimates of particle size distributions (PSDs) in solid-in-liquid suspensions can be obtained from measurements of ultrasonic wave attenuation. The technique is based on adaptively fitting theoretical wave propagation models to the measured data across a frequency range. These models break down at high solid concentrations and it is believed that this failure is due to the effective viscosity of the mixture in the vicinity of the particles being different from that of the continuous phase. This paper discusses PSD estimation when a number of different viscosity formulations are incorporated into the wave propagation model. The viscosity model due to Happel provides the best estimate of PSD in suspensions of medium concentration.

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“…The possible application of ultrasonics for determining solid contents has been realized for over 40 years, and it has been applied to a variety of different systems since then. These include: pulp suspensions, polymer solutions (Kuster & Toksoz, 1974), coal slurries (Davies, 1978;Sayers, 1980), paints (Piostrowska, 1971;Saraf & Samal, 1984), and a number of foods (Zacharias & Parnell, 1972). Ultrasonics has been employed on a number of occasions in the fats and oils industry, but until recently most of these applications have been purely empirical (Gouw & Vlugter, 1967;Hustad, et al, 1970;Kuo, 1975Kuo, ,1979Rao, Reddy & Prabhv, 1980;Bhattacharya & Deo, 1981).…”

Section: Introductionmentioning

confidence: 99%

“…The various other factors that can affect the ultrasonic velocity through a dispersion are multiple scattering (Davies, 1978;Sayers, 1980), thermal scattering (Ahuja, 1973) and particle shape (Ahuja & Hendee, 1978), but they are not significant in the fatty systems of interest and are not considered further.…”

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Solid fat content determination using ultrasonic velocity measurements

McClements

Povey

1987

Int J of Food Sci Tech

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The ultrasonic group velocity has been measured through 0-20% mass fraction samples of tristearin, tripalmitin, trilaurin and 1-oleodipalmitin suspended in paraffin oil at 25°C and 1 MHz. For tristearin, tripalmitin and trilaurin there is an increase of about 3.1 m/sec per 1% increase in insoluble triglyceride in suspension. For trilaurin and l-oleodipalmitin there is a slight decrease in velocity with increasing soluble triglyceride. The technique may, therefore, prove useful for determination of solubilities of triglycerides in suspension, as well as for determining solid fat contents. For the tristearin/paraffin oil suspensions there is a good correlation between the solid content added and that predicted by a theoretical formula available in the literature (correlation = 0.998 for twenty samples). The reproducibility of the solid fat content determination is k0.2%, the accuracy is about 0.6%. The technique is easily automated, cheap, accurate, rapid and non-intrusive and should, therefore, prove useful both as an in-line quality control monitoring device and as a new instrumental technique for research applications.

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Coal slurry diagnostics by ultrasound transmission

Cited by 48 publications

References 0 publications

Ultrasonic Wave Propagation in Silica Sols and Gels

Ultrasonic Wave Propagation in Silica Sols and Gels

Effective viscosity in a wave propagation model for ultrasonic particle sizing in non-dilute suspensions

Solid fat content determination using ultrasonic velocity measurements

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