Energy loss at bends in the pneumatic conveying of fly ash

Tripathi, Naveen Mani; Sharma, Atul; Mallick, Soumya Suddha; Wypych, Peter W

doi:10.1016/j.partic.2014.09.003

Cited by 28 publications

(8 citation statements)

References 7 publications

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“…The authors developed and patented a number of designs of screw conveyors with rotary casings and also the directions of screw conveyors operational life increase are described in some papers (Tripathi, et. al., 2015;Roberts, 2015;Mondal, 2018).…”

Section: Introductionmentioning

confidence: 99%

Research of Non-Resonant Oscillations of the "Telescopic Screw - Fluid Medium" System

Lyashuk

Hevko

Hud

et al. 2022

INMATEH

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In the article it is substantiated the value of the angular speeds of rotation of the auger screw, which leads to the breakdown of its lateral vibrations. The dependences describing the law of change of amplitude or natural frequency at slowly variable length of the telescopic screw are deduced. Based on the Van der Paul’s method, in the developed system differential equations are obtained that determine the laws of change of amplitude and frequency of the wave process in the system of a telescopic propeller. It is established that for nonresonant oscillations for this system the main parameters of bending oscillations are a continuous flow of bulk medium - the screw does not depend on its small torsional oscillations and external periodic perturbation. The analysis of the given regression equations shows that to reduce the torque of the auger it is necessary to reduce the frequency of its rotation and the angle of the conveyor. The constructive diagram and the results of theoretical calculations for assessing the influence of constructive-kinematic parameters on the torque indicators of the telescopic screw conveyor are presented.

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Section: Introductionmentioning

confidence: 99%

Research of Non-Resonant Oscillations of the "Telescopic Screw - Fluid Medium" System

Lyashuk

Hevko

Hud

et al. 2022

INMATEH

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“…He applied this model for predicting the pressure drop for a 70-m long pipeline. Tripathi et al (2015) developed an equation of solid friction factor involving solids loading ratio and mean Froude number of the flow. The equation was applied for calculating the straight line pressure drop and subsequently calculating the bend pressure drop by deducting it from the total pressure drop.…”

Section: Introductionmentioning

confidence: 99%

“…Correlations presented by Weber (1981), Jones and Williams (2003), Mallick and Wypych (2007), Behera et al (2013) and Tripathi et al (2015) consist of only the dimensionless parameters gas Froude number and solids loading ratio which are the representation of flow parameters only. Setia et al (2016) and Setia et al (2017) included volumetric loading ratio and velocity ratio in the correlations which are also in terms of flow parameters only.…”

Section: Introductionmentioning

confidence: 99%

Modelling and analysis of flow of powders through long pipelines

Shijo

Behera

2020

WJE

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Purpose The purpose of this paper is to focus on predicting the pressure drop in fluidized dense phase pneumatic conveying of fine particles through pipelines by modelling the solids friction factor in terms of non-dimensional parameters using experimental data of definite pipeline configuration. Finally, the model is to be tested for a different pipeline configuration. Design/methodology/approach Solids friction factor has been expressed in terms of certain non-dimensional parameters such as density ratio, solids loading ratio and mean particle diameter to pipe diameter ratio, and a certain number of coefficients and exponents. Experimental data of five conveying materials (two types of fly ash, two types of alumina and one type of cement meal) for a pipeline configuration of diameter 53 mm and length 173 m and another conveying material EPS dust for two pipeline configurations (69-mm diameter, 168-m long; 105-mm diameter, 168-m long) have been used to calculate the unknown coefficients or exponents of the mathematical model for solids friction factor. Findings The developed model gives the best results in predicting the pressure drop for the pipelines that are less than 173-m long, but the model shows a large error for the pipelines more than 173-m long. Research limitations/implications Current research will be helpful for the researchers to model the process of pneumatic conveying through long distances. Practical implications The method will be helpful in conveying powder materials through long distances in cement or brick industry, alumina industry. Social implications Fly ash piles over at the nearby places of thermal power plants. Pneumatic conveying is the best method for transporting the fly ash from the location of power plants to the nearby brick industries or cement industries. Originality/value Solid friction factor has been presented in terms of four non-dimensional parameters and evaluated the accuracy in predicting the pressure drop for two different pipeline configurations.

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“…The results of this research can present better the usige of screw feeders for specific materials. In-works [9][10][11][12][13] it was conducted the experiment for determination influence of parameterswhich have the most influence on horizontal screw conveyers and also power consumption at transporting of grains.So, in works [14] it is adduced the results of researches saving transporting of agricultural materials on the horizontal and aslope located screw working parts, character of motion of stream of material at its loading [15] and overload ing [16], and also moving material by the vertical screws [17] which it is expedient to take into account during realization of researches of moving of stream of root crops and their cleaning.…”

Section: Introductionmentioning

confidence: 99%

Torsional oscillations of an auger multifunctional conveyor’s screw working body with consideration of the dynamics of a processed medium continuous flow

Ляшук¹,

Вовк²,

Tson³

et al. 2018

Ukr. food j.

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Keywords: Screw Amplitude Resonance ConveyorIntroduction. The aim of the article is a mathematical model of vibrations of working part of screw conveyer for transporting friable loads taking into account the changes of closeness of the processed environment, speed of circulation of screw, weight while appearing of the phenomenon of resonance. Materials and methods. It is recesrced the turning vibrations of spiral working part of screw multifunctional conveyer, which appeare as a result of action of processing environment. The recerch was carried out by mathematical modelling method.Results and discussions. The limiting factors which complicate a design are the unevenness of the division of environment along the length of screw; a body makes flexible vibrations; the motion of the processed environment along the working screw causes the small vibrations of bend, causes appearance of "additional forces". For providing the authenticity of mathematical model ti has been introduced the next suppositions: the working part of screw is turned with the permanent angle speed around its longitudinal which in the undeformed position coincides coincides with an axis OX; the transversal transferring of neutral axis of working screw at the arbitrary moment in perpendicular direction of its undeformed position is determined by the vector (in relation to the fixed frame of reference of OXYZ); the continuous stream of processed environment,while its weight changes on unit length slowly along a screw and moves with permanent relative (in relation to working screw) speed.A mathematical model takes into account the limitation and supposition for the existent screw conveyer with the length of 2,5 and 3 m, which is used for moving the friable loads with the consistence of 10, 20, 40 kg/m. The alternative parameters are the length of the screw,the consistence of the processed environment, the speed of circulation ofthe screw , weightOn the basis of model the dependences of amplitude of vibrations on the lengthof screw , cosistence of the processed environment, the speed of circulation of the screw, weight are built.Conclusions. A mathematical model allows to improve the process of development and designing of the screw conveyers of the friable loads providing the reliability of process of transportion and system "the processed environment -the screw working part".

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Energy loss at bends in the pneumatic conveying of fly ash

Cited by 28 publications

References 7 publications

Research of Non-Resonant Oscillations of the "Telescopic Screw - Fluid Medium" System

Research of Non-Resonant Oscillations of the "Telescopic Screw - Fluid Medium" System

Modelling and analysis of flow of powders through long pipelines

Torsional oscillations of an auger multifunctional conveyor’s screw working body with consideration of the dynamics of a processed medium continuous flow

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