Rheological and Hindered Settling Studies on Bimodal Mixture Based on Multi-size and Multi-density Slurry: Multi-component Viscosity Model Development

Padhi, Mandakini; Sowmya, Bandi; Mohan, Anand; Mangadoddy, Narasimha

doi:10.1007/s12666-020-01993-x

Cited by 2 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The modified slurry viscosity consists of two key factors, the effect of the solids fraction on viscosity and the effect of fines (less than −38 μm) for enhancing the viscosity effect. These are represented as follows: In another study that was presented by the authors, the hindered settling velocities are verified against the Richardson–Zaki correlation, and incorporated as UDF in the simulation. In 1954, Richardson and Zaki presented the uniform spherical particle fall velocity for particle settling in a tank with diameter much larger than the particle diameter, which is represented as where ε is the voidage and C is the volume fraction of the solids in the suspension, and V o is calculated from the Stokes flow, which is given as …”

Section: Methodsmentioning

confidence: 99%

Understanding the Bicomponent Particle Separation Mechanism in a Hydrocyclone Using a Computational Fluid Dynamics Model

Padhi

Kumar

Mangadoddy

2020

Ind. Eng. Chem. Res.

Self Cite

View full text Add to dashboard Cite

The multiphase numerical modeling of hydrocyclone performance is studied using heterogeneous (bidensity and similar particle-size distribution) feed particle systems. The modified Algebraic Slip Model with Large Eddy Simulation model is utilized for simulating the particle dynamics and turbulence field. The centrifugal (F c), drag (F d), and turbulent dispersion (F td) forces are quantified and assessed to understand the particle separation mechanism. The acceleration ratios (N t and N D) quantities are compared radially at different axial locations at feed solids loadings of 10–20 wt %. The fine particles (<11 μm) of lesser density is observed segregating toward the air core (N D > 1). The N t values for the finer and denser components are observed to be higher near the spigot region, indicating the dense medium effect, enhancing the fines misplacement to underflow. However, inertial forces (F c) dominantly influence the coarser particles. The equilibrium envelopes for each particle size and density are evaluated to illustrate the interaction of component in the mixture and standalone-component classification performances.

show abstract