Coefficient of restitution for wet particles

Gollwitzer, Frank; Rehberg, Ingo; Kruelle, Christof A.; Huang, Keqing

doi:10.1103/physreve.86.011303

Cited by 101 publications

(92 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here h r is the surface roughness, which is used to avoid the physical singularity when h is approaching zero [14]. In stage II, the grain collides with the wall with no interstitial fluid evolves any more [10]. We use v 1 and v 2 to represent the particle velocities that are just contacting and leaving the wall surface.…”

Section: Theoretical Modelsmentioning

confidence: 99%

“…V b is the liquid bridge volume, which is estimated as d 3 /16 [10]. The rupture distance h rup is crucial to determine the breaking point of the liquid bridge.…”

Section: Theoretical Modelsmentioning

confidence: 99%

“…We use v 1 and v 2 to represent the particle velocities that are just contacting and leaving the wall surface. Therefore, v 1 and v 2 are correlated with the restitution coefficient between the particle and the dry wall [6,10], which is given as v 2 = -e dry v 1 , where e dry is the restitution coefficient for dry condition.…”

Section: Theoretical Modelsmentioning

confidence: 99%

“…Due to the hydrodynamic and viscous fluid flows in this liquid film, the first-contact energy loss [9] of wet particles is higher than that of dry ones [10]. Experiments can determine the particle velocities before and after collisions, so that the first-contact energy loss is obtained according to the velocity differences [10]. However, the details of contact mechanism of wet particles are relied on the theoretical analysis [11].…”

Section: Introductionmentioning

confidence: 99%

“…The thin liquid layer covering a wet grain helps to push or pull the other grain [8]. Due to the hydrodynamic and viscous fluid flows in this liquid film, the first-contact energy loss [9] of wet particles is higher than that of dry ones [10]. Experiments can determine the particle velocities before and after collisions, so that the first-contact energy loss is obtained according to the velocity differences [10].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Contact forces between a particle and a wet wall at both quasi-static and dynamic state

Zhang

Chen

2017

EPJ Web Conf.

View full text Add to dashboard Cite

Abstract. The contact regime of particle-wall is investigated by the atomic force microscope (AFM) and theoretical models. First, AFM is used to measure the cohesive force between a micron-sized grain and a glass plate at quasi-static state under various humidity. It is found out that the cohesive force starts to grow slowly and suddenly increase rapidly beyond a critical Relative Humidity (RH). Second, mathematical models of contacting forces are presented to depict the dynamic process that a particle impacts on a wet wall. Then the energy loss of a falling grain is calculated in comparison with the models and the experimental data from the previous references. The simulation results show that the force models presented here are adaptive for both low and high viscosity fluid films with different thickness.

show abstract

Section: Theoretical Modelsmentioning

confidence: 99%

“…V b is the liquid bridge volume, which is estimated as d 3 /16 [10]. The rupture distance h rup is crucial to determine the breaking point of the liquid bridge.…”

Section: Theoretical Modelsmentioning

confidence: 99%

Section: Theoretical Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Contact forces between a particle and a wet wall at both quasi-static and dynamic state

Zhang

Chen

2017

EPJ Web Conf.

View full text Add to dashboard Cite

show abstract

Micromechanics of agglomeration forced by the capillary bridge: The restitution of momentum

et al. 2013

View full text Add to dashboard Cite

The formation of capillary bridge formed by a liquid adsorbate is one of the main reasons for agglomeration in multiphase flows. Agglomeration takes place when the relative momentum of two colliding particles is fully consumed by the bridge. This article presents a theoretical study of the collisions of particles with adsorbed liquid taking into account the influence of capillary and viscous dissipative forces. The article proposes an approximate analytical solution for the dynamics of the bridge formed during the collision, together with a more complete numerical model, which is validated with experimental data. The restitution of the relative momentum of the colliding particles, depending on a series of dimensionless parameters characterizing the bridge, is investigated. A criterion for prediction of agglomeration, or "collision efficiency," in a flow involving cohesive particles is given. An expression is proposed for the coefficient of restitution for the case of collision via a liquid bridge. _ ext 50, v A 0 520:052, v S 0 50:052.The arrows indicate the direction of particle movement.

show abstract

A novel approach to determine wet restitution coefficients through a unified correlation and energy analysis

et al. 2014

View full text Add to dashboard Cite

Wet particle interactions are observed in many applications, for example, pharmaceutical, food, agricultural, polymerization, agglomeration, and coating, in which an accurate evaluation of the wet restitution coefficient (ewet) is crucial to understand the particle flowability, operating conditions and product size distribution. Experiments were performed to measure the wet restitution coefficient by impacting a spherical particle on a stationary plate covered with a thin liquid layer of water or glycerol solution in this work. Furthermore, novel approaches for estimation of ewet were developed using dimensional analysis (using the Buckingham π theorem and regression analysis) in combination with energy budget analysis. In the correlation development, the dominant physical properties of solid and liquid, particle impact velocity and liquid layer thickness are grouped into well‐known dimensionless numbers viz. Reynolds, Weber and Stokes. Whereas in the energy analysis, the energy dissipation rates were determined for five distinct collision phases, that is, dipping, dry collision, undipping, formation and breakage of the liquid bridge, and added mass. The efficacy of the developed approaches was analyzed by comparing obtained results with experiments and an elastohydrodynamic model, and a modified elastohydrodynamic model. © 2014 American Institute of Chemical Engineers AIChE J, 61: 769–779, 2015

show abstract

Coefficient of restitution for wet particles

Cited by 101 publications

References 44 publications

Contact forces between a particle and a wet wall at both quasi-static and dynamic state

Contact forces between a particle and a wet wall at both quasi-static and dynamic state

Micromechanics of agglomeration forced by the capillary bridge: The restitution of momentum

A novel approach to determine wet restitution coefficients through a unified correlation and energy analysis

Contact Info

Product

Resources

About