Solids flow velocity profiles in mass flow hoppers

Polderman, H.G.; Boom, J.M. Van Den; Hilster, E. De; Scott, A.M.

doi:10.1016/0009-2509(87)80033-7

Cited by 14 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Runesson et al (1986), Polderman et al (1987), Johnson and Jackson (1987), Savage (1988), Campbell (1990), Gu et al (1992), Adams and Briscoe (1993), AbuZaid and Ahmadi (1993)). Most of them use the Eulerian approach for the granular material behavior.…”

Section: Continuum Mechanics Approachmentioning

confidence: 99%

An approach to simulate the motion of spherical and non-spherical fuel particles in combustion chambers

2001

View full text Add to dashboard Cite

The objective of this paper is to identify a numerical method to simulate motion of a packed or fluidized bed of fuel particles in combustion chambers, such as a grate furnace and a rotary kiln. Therefore, the various numerical methods applied in the areas of granular matter and molecular dynamics were reviewed extensively. As a result, a time driven approach was found to be suited for the numerical simulation of particle motion in combustion chambers. Furthermore, this method can also be employed to moving boundaries which are required for the present application e.g. travelling grate. The method works in a Lagrangian frame of reference, which uses the position and orientation of particles as independent variables. These are obtained by time integration of the three-dimensional dynamics equations derived from the classical Newtonian approach for each particle. This includes the keeping track of all forces and momentums acting on each particle at every time step. Viscoelastic contact forces include normal and tangential components with viscoelastic models for energy dissipation and friction. The particle shapes are approximated by spheres and ellipsoids with a varying size and ratio of the semi-axis accounting for the variety of particle geometries in a combustion chamber. For these shapes the overlap of particles during contact is expressed by a polynomial of 4th order in the two-dimensional case and a polynomial of 6th order in the three-dimensional case. A new algorithm to detect two-dimensional elliptical particle contact with sufficient accuracy was developed. It is based on a sequence of coordinate transformations and has demonstrated its reliability in numerous applications. Finally, the method was applied to simulate the motion of spherical and elliptical particles in a rectangular enclosure, on a travelling grate, and in a rotary kiln.

show abstract

Section: Continuum Mechanics Approachmentioning

confidence: 99%

An approach to simulate the motion of spherical and non-spherical fuel particles in combustion chambers

2001

View full text Add to dashboard Cite

show abstract

“…Unfortunately the majority of the analytical solutions proposed for this model were experimentally non‐reproducible. [ 24–26 ] The experimental prediction of flow velocity profiles inside silos and hoppers is primarily based on tracking a tracer path along its passage through a granular bed. This tracer must have more or less the same characteristics as the studied granular system in order to mirror its behaviour while being detectable using appropriate monitoring technologies such as the photographic method, [ 27–29 ] infrared spectroscopy, [ 30–32 ] and x‐ and γ‐rays.…”

Section: Introductionmentioning

confidence: 99%

Gravity mass powder flow through conical hoppers ‐ Part I: A mathematical model predicting the radial velocity profiles of free‐flowing granular systems as a function of cohesion and adhesion properties

et al. 2021

View full text Add to dashboard Cite

It has been demonstrated that the concentration, velocity profiles, and residence time distribution (RTD) of a binary powder mixture flowing under gravity‐driven conditions can be evaluated via near‐infrared spectroscopy (NIRS). Contrary to a classical fluid flow profile, a granular flow profile was proven to be a function of cohesion and adhesion powder mixture properties. The present work aimed to develop a semi‐empirical equation inspired by the radial flow profile equation used for classical fluids. It achieves this by introducing the effect of powder friction properties as internal (particle‐particle) and external (particle‐hopper wall) friction angles. The developed equation shows good agreement with the experimental results using various hopper angles and two types of free‐flowing granular systems. The knowledge gained from the developed equation is intended to predict flow behaviour in conical hoppers as a function of flowing powder adhesion and cohesion parameters. Combining such knowledge with residence time distribution and the radial concentration profiles would make it possible to evaluate the expected extent of segregation, which could lead to prohibitive deviations in the production of pharmaceutical solid dosage forms.

show abstract

Measurement of velocity profiles in conical hoppers

Cleaver

Nedderman

1993

Chemical Engineering Science

View full text Add to dashboard Cite

Solids flow velocity profiles in mass flow hoppers

Cited by 14 publications

References 4 publications

An approach to simulate the motion of spherical and non-spherical fuel particles in combustion chambers

An approach to simulate the motion of spherical and non-spherical fuel particles in combustion chambers

Gravity mass powder flow through conical hoppers ‐ Part I: A mathematical model predicting the radial velocity profiles of free‐flowing granular systems as a function of cohesion and adhesion properties

Measurement of velocity profiles in conical hoppers

Contact Info

Product

Resources

About