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Journal ArticleDOI

Review and analysis of solids friction factor correlations in fluidized dense phase conveying

02 Jan 2021-Tribology - Materials, Surfaces & Interfaces (Taylor & Francis)-Vol. 15, Iss: 1, pp 1-9
TL;DR: In this paper, the authors presented solids friction factor correlations for the fluidized dense phase conveying of fine particles or powders and showed that the pressure drop for conveying can be predicted using these correlations.
Abstract: Few researchers have presented solids friction factor correlations for the fluidized dense phase conveying of fine particles or powders. Pressure drop for conveying can be predicted using these cor...
Citations
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Journal ArticleDOI
TL;DR: An overview of pneumatic conveying systems and performance single phase flow in PNEs can be found in this article, where the flow behavior of solids from silos, wear in pNEs, ancilliary equipment control of pNE transport instrumentation system design and worked examples are discussed.

11 citations

Journal ArticleDOI
TL;DR: In this paper, the authors presented a model for these curves based on the assumption that the pressure drop is a sum of two terms relating to the gas only influence and a combined gas and solids term.

9 citations

Journal ArticleDOI
TL;DR: In this article , the heat transfer capacity of dense-phase transport flow as a heat transfer fluid (HTF) in a vertical tube was demonstrated, and a semi-empirical correlation was developed relating the Nusselt number to Froude number, Reynolds number, and particle-tube diameter ratio.
Journal ArticleDOI
TL;DR: In this paper , the performance of a previously proposed model for predicting pressure drop is evaluated using biomass materials, namely cottonseeds, wood pellets, wood chips, and wheat straw.
Abstract: This study investigates pneumatic conveying of four different biomass materials, namely cottonseeds, wood pellets, wood chips, and wheat straw. The performance of a previously proposed model for predicting pressure drop is evaluated using biomass materials. Results indicate that the model can predict pressure with an error range of 30 percent. To minimize the number of trial tests required, an optimization algorithm is proposed. The findings show that with a combination of three trial tests, there is a 60 percent probability of selecting the right subset for accurately predicting pressure drop for the entire range of tests. Further investigation of different training subsets suggests that increasing the number of tests from 3 to 7 can improve the probability from 60% to 90%. Moreover, thorough analysis of all three-element subsets in the entire series of tests reveals that when considering air mass flow rate as the input, having air mass flow rates that are not only closer in value but also lower increases the likelihood of selecting the correct subset for predicting pressure drop across the entire range. This advancement can help industries to design and optimize pneumatic conveying systems more effectively, leading to significant energy savings and improved operational performance.
References
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Journal ArticleDOI
TL;DR: In this article, a physically based model for the numerical prediction of wall-bounded particulate flows is presented, which is of great interest for the powder processing industries in order to support process development and optimisation.

163 citations

Book
22 Feb 1990
TL;DR: An overview of pneumatic conveying systems and performance single phase flow in PNEs can be found in this paper, where the authors discuss the flow behavior of solids from silos, wear in pNEs, and ancilliary equipment control of pNE transport instrumentation system design.
Abstract: Nomenclature an overview of pneumatic conveying systems and performance single phase flow in pneumatic conveying systems fluid and particle dynamics fundamentals flow regimes in vertical and horizontal conveying principles of pneumatic conveying feeding of pneumatic conveying systems flow in standpipes and gravity conveyors overview of high pressure systems including long distance and dense phase pneumatic conveying systems gas-solids separation some comments on - the flow behaviour of solids from silos, wear in pneumatic conveying systems, ancilliary equipment control of pneumatic transport instrumentation system design and worked examples

163 citations

Journal ArticleDOI
TL;DR: In this paper, the pneumatic transport of solid particles in both horizontal and vertical pipes was studied using glass beads, copper spheres, millet and grass seeds, having diameters ranging from 0.1 to 1.0mm.
Abstract: The pneumatic transport of solid particles in both horizontal and vertical pipes was studied using glass beads, copper spheres, millet and grass seeds, having diameters ranging from 0.1 to 1.0mm. It was shown that the additional pressure drop and the particle velocity could be expressed by ΔPs/L=0.057 (ua/√gD)mρa, and us=ua-ut, respectively, in the case of vertical transport. In vertical transport, the copper spheres and glass beads were found to be densely distributed toward the wall of the pipe whereas higher concentration near the axis was observed for, polystyrene particles. The velocity profile of the air in the vertical pipe was symmetrical and was not appreciably affected by the addition of the particles. However, in the horizontal pipe, the velocity profile was asymmetric with respect to the pipe axis, and was found to be affected by the particle diameter, density, and the mass flow ratio of the air and the particles. A simple impulsive model was used to explain the additional pressure drop in horizontal conduits, which was thought to be caused mainly by the collision between the particles and the surface of the pipe wall.

145 citations

Journal ArticleDOI
TL;DR: In this article, a 3-inch diameter riser 30 feet in length using solids ranging in particle Reynolds number from 100 to 3500 was studied in vertical pneumatic conveying.
Abstract: Vertical pneumatic conveying was studied in a 3-inch diameter riser 30 feet in length using solids ranging in particle Reynolds number from 100 to 3500. Particle to gas mass flow ratios varied from 0 to 8 and pipeline conditions extended from dilute flow down into the choking region. Average particle hold-up was determined by means of a series of quick-closing valves and particle slip velocity was often found to be greater than the calculated terminal velocity. The reasons for this are examined. Frictional pressure losses in the riser were also determined and compared with literature data. The phenomenon of choking is considered briefly. On a etudie le transport pneumatique et vertical, dans un tuyau de 30 pieds de longueur et 3 pouces de diametre, en utilisant des matieres solides dont les nombres de Reynolds des particules variaient entre 100 et 3500. Les rapports d'ecoulement entre les particules et le gaz variaient de 0 a 8 et les conditions dans le tuyau se sont etendues d'un ecoulement dilue a la region d'engorgeinent. On a determine la retention moyenne des particules, au moyen d'une serie de soupapes qui fermaient rapidement, et l'on a souvent trouve que la velocite de glissement etait plus elevee que la velocite terminate qu'on avait calculee; on en analyse les raisons. On a aussi determine les pertes de pression dues a la friction dans le tuyau et les a comparees avec les donnees publiees. On considere brievement le phenomene d'engorgement.

145 citations

Journal ArticleDOI
TL;DR: In this article, the most significant advantages, disadvantages and pitfalls of pneumatic conveying technology are summarized, and a discussion of the development of prediction procedures for pressure drop and state of flow is used to show the development in the technology itself.

127 citations