Settling velocities of particulate systems part 17. Settling velocities of individual spherical particles in Power-Law non-Newtonian fluids

Concha, F.; Uribe, Lina

doi:10.1016/j.minpro.2015.07.005

Cited by 20 publications

(11 citation statements)

References 13 publications

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“…where C D , U r , and A p is the drag coefficient, settling velocity, and granular agglomerate cross-section. Settling velocity is a function of the drag coefficient and Reynolds number [20]. Because the fluid velocity at the time of settling is equal to 0, the Drag coefficient is expressed by the equation…”

Section: Impinging In Very-fine Granularmentioning

confidence: 99%

An experimental study of fluidization post impinging fluid in granular bed for breaking sedimentation

Yudiyanto¹,

Wardana

Hamidi

et al. 2020

EEJET

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The impinging fluid can be used as a prevention of sedimentation in the flow of the pipe and the mixing process. Sedimentation is a problem that often occurs in fluid transportation and fluidization. Granular material behavior due to impinging is a phenomenon that is rarely studied. This condition is difficult to observe due to the position of complex fluid movements in the bed. The study tries to find the behavior of fluidization at various granular sizes. The effect of impinging into the granular bed has been observed with experimental studies. Hele-Shaw cell is used as equipment for the observation process. The glass sand is used as a medium of fluidization. The high-speed fluid is injected into a granular bed in a short time. Granular material moves because of the pressure impinging as fluidization. The motion of the granular material is observed by a camera to determine the behavior of the granular material. The primary outcome of the present study is the identification of two very distinct regimes. There are two types of post-impinging fluidization. The first type is the fluid cavity and fluidization. The condition starts with a fluid cavity expansion and continues with the fluidization process. The fluid cavity occurs because the fluid shock pressure pushes the granular material upward. Granular bonds hold the particles' connection and form a cavity. Fluidization after cavity expansion is a settling motion that is influenced by gravity, buoyancy, drag, and granular bonds. The other type is a local fluidized state. The limit for the occurrence of fluid cavity and fluidization is observed with the Reynolds number of impinging. The Reynolds number of impinging is calculated by the velocity of entry of the shock fluid in the granular and multiplied size of the particles divided by the viscosity. The fluid cavity post-impinging occurs at the Reynolds number of the impinging process less than 4,000 (laminar and transition flow area). The local fluidized state has Re of impinging more than 4,000, and the fluidization follows the flow and disappears immediately. This condition causes the bonding of the granules cannot maintain the agglomeration of the granules

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Section: Impinging In Very-fine Granularmentioning

confidence: 99%

An experimental study of fluidization post impinging fluid in granular bed for breaking sedimentation

Yudiyanto¹,

Wardana

Hamidi

et al. 2020

EEJET

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“…Granular by moving due to gravity with an initial velocity of 0 mm/s. Settling velocity is influenced by the drag coefficient and Reynolds number [26]. The analysis shows that the destabilization of the submerged bed depends primarily on the initial stabilizing density contrast when the grains are heavier than the surrounding liquid [27].…”

Section: Effect Of Granular Diameter On Instability After Upward Imentioning

confidence: 99%

An investigation of granular material movement due to instability post impinging upward fluid

Yudiyanto

Wardana

Widhiyanuriyawan

et al. 2020

EEJET

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Granular is a form of material that is widely used in the industry. To move the granular material, energy is needed to form a flow of granular. Granular instability can be utilized to move granular material. Prevention of jamming and clogging is done by breaking down the parts of the granular, which are locking. Impinging fluid in the granular is used to create granular instability. An observation was made using the experimental method. The granular in the Hele-Shaw cell is shot with fluid in the granular body and results in instability motion. Fluid impinging breaks granular bonds and forms fluid cavities. Furthermore, the fluid cavity moves upward due to unstable conditions. Granular with a strong bond is loose in the form of the agglomerate. Agglomerate is destroyed in the process of moving because there is a drag force. Granular with weak bonds tries to maintain individually form fingering. Granular moves down in the settling process to find a stable position. Instability is affected by the bonds between the grains. A comparison between the cohesion force and the mass weight of the particles is expressed as a granular Bond number B og. In glass sand material, strong granular bonds occur at granular sizes below 100 µm. Granular bonds affect the movement of instability in groups. The value of the granular Bond number is greater than 1. At sizes of 100 to 230 µm, the granular bond still affects the granular instability with the fingering pattern in the granular motion. The value of the granular Bond number is close to 1. Granular sizes above 230 µm indicate the presence of non-dominant bonds between the grains. The individual granular mass is higher than the cohesion force that occurs at the interface between the granular, and the granular Bond number value is less than 1

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“…Malvandi, et al performed an analytical study for evaluating the unsteady behaviour of spherical particle in pseudoplastic fluids. Betancourt, et al furthered the work of Kelessidis and proposed another theoretical settling velocity equation for power law non‐Newtonian fluids. Although the predictions were improved, but the equation over‐predicted the terminal velocity by more than 25% at various points.…”

Section: Particle Motion In Non‐newtonian Fluidsmentioning

confidence: 99%

Hydrodynamics of macroscopic particles in slurry suspensions

Wadnerkar

Agrawal

Tade

et al. 2016

Asia-Pacific J Chem Eng

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Slurry systems in mineral processing processes often behave as pseudo-plastic fluids, where the viscosity of the slurry changes as a function of the shear imparted. Thus, characterizing motion of macroscopic objects through such systems is a challenging task because the viscous forces on it vary rapidly. In this paper, we have studied motion of falling spherical particles in non-Newtonian fluid using a novel macroscopic particle model (MPM). The simulation results were compared with the available experimental data and analytical correlations, where MPM was found to be effective in accurately determining the forces acting on particle during fluid-particle interaction. Thus, it was concluded that MPM is a computationally viable solution for resolving hydrodynamics of macroscopic particles in slurries, especially for its ability to accurately capture the acceleration of particles, which is significantly lower when compared with that in Newtonian fluids. The validated MPM model was used to investigate the effect of particle properties on the motion of particle and yieldstructure of fluid. For low Reynolds number, the well-known toroidal yielded structure of fluid was observed with particle equator as centre and √2d p diameter. Beyond the Reynolds number to Bingham number ratio of 10, a wake was formed behind the particle that increased with increasing Reynolds number.

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Settling velocities of particulate systems part 17. Settling velocities of individual spherical particles in Power-Law non-Newtonian fluids

Cited by 20 publications

References 13 publications

An experimental study of fluidization post impinging fluid in granular bed for breaking sedimentation

An experimental study of fluidization post impinging fluid in granular bed for breaking sedimentation

An investigation of granular material movement due to instability post impinging upward fluid

Hydrodynamics of macroscopic particles in slurry suspensions

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