Estimation of pressure drop for vertical pneumatic transport of solids

Jones, Jennings H.; Braun, Walter G.; Daubert, Thomas E.; Allendorf, H. D.

doi:10.1002/aic.690130338

Cited by 29 publications

(14 citation statements)

References 5 publications

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“…For high-pressure systems, the only available data is Knowlton and Bachovchin's experiment (1976) with a wide distribution of particle size. For low-pressure systems in the literature, there have been more data on pressure drop for pneumatic conveying of the solids such as Vogt and White (1948), Zenz (1949), Hariu and Malstad (1949), Belden and Kassel(1949), Metha, Smith and Comings (1957), Jones et al (1967), Konno and Saito (1969), and Konchesky et al (1975). Except for Zenz (1949) and Vogt and White, (1948) the other investigators did not report the particle distribution, which is one of the important factors in flow behavior of the pneumatic conveying of solids and is also a necessary and essential variable to our model.…”

Section: Comparison With Pressure Drop Experimental Datamentioning

confidence: 98%

Analysis of vertical pneumatic conveying of solids using multiphase flow models

1982

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The multiphase flow models were used to predict pressure drop and segregation of particles flowing in a vertical pipe. To compare calculations with data, it was necessary to assume an effective particle size based on a coefficient of restitution and on inlet void fractions. Different partifle size distributions with equal average particle size generate distinctly different pressure drops and segregations. Contribution of solid interaction force is very important in accounting for the segregation of the particles in a vertical pipe.All models gave a reasonable prediction of the design parameters. The pressure drops predicted by the models agreed well with both high-and low-pressure experiments. For the design of vertical solids pneumatic transport systems, the literature offers several empirical correlations and hydrodynamic models. The former are limited to the particular data base and the latter are generally limited to narrow particle size distributions. To design for the transport of solids of wide distribution requires a proper accounting of both the segregation of particles and its effects on pressure drop and choking limits. HAMlDA hydrodynamic model of such systems must consider the solids as a component of many phases. If the solids are assumed to consist of a finite number of solid phases, previously developed two-or threephase hydrodynamic models can be extended to the more complex systems. Furthermore, it is apparent that interaction between particles should be considered in the model. The present work is directed along these paths. CONCLUSIONS AND SIGNIFICANCEIn this work, a multiphase hydrodynamic model was developed for vertical pneumatic transport of solids to account for the effects due to particle size distribution. The model includes terms to account for particle interaction. The potential of predictions of phenomena such as choking, solids segregation, and minimum pressure drop was shown, and the dangers of using a mean particle size in a system of wide distribution were demonstrated. The appropriateness of the model was shown by comparison of calculated and reported pressure drops in systems of widely different operating pressures. The studies indicate the importance of and therefore the need for better estimates of particle interaction forces and voidage to relate segregation and pressure drop to the operating parameters of flow rates, size distribution, and pressure.

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Section: Comparison With Pressure Drop Experimental Datamentioning

confidence: 98%

Analysis of vertical pneumatic conveying of solids using multiphase flow models

1982

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“…-Pressure drop: The pressure drop in the riser is modelled similarly to the pneumatic transport of solid particles in the vertical direction. The following terms are considered as the contributing factors to the pressure drop within the riser (Jones et al, 1967;Yang, 1973Yang, , 1974. * acceleration of solid particles DP r1 8F 2 cat (3:6 10 5 ) 2 p 2 r part gd 4 riser…”

Section: Mixermentioning

confidence: 99%

Industrial Experience with Object-Oriented Modelling

Rao

Rengaswamy

Suresh

et al. 2004

Chemical Engineering Research and Design

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“…We are going to compare here the same effective work, solid effective work, and energy factor and the same calcula- tion procedure already proposed in Collado and Muiioz (1997) with experimental data for atmospheric-pressure, vertical pneumatic transport tests made by Jones et al (1966Jones et al ( , 1967 from the Pennsylvania State University. The height of the line was 5.79 m, and, until twelve different materials were tested, all of them had a very narrow size distribution.…”

Section: Energy Factor Vs Atmospheric-pressure Vertical Pneumatic Cmentioning

confidence: 99%

“…In this article, after a brief review of this new approach based on thermodynamic fundamentals, the comparison of the energy factor against atmospheric-pressure data taken in the 5.8 m lift line of the Pennsylvania State University (Jones et al, 1966(Jones et al, , 1967 is analyzed, and a strong dependence of the energy factor on the solids reference velocity has been also verified for the atmospheric-pressure data. A brief outline of this analysis was already sketched in Collado (2000d).…”

Section: Introductionmentioning

confidence: 99%