In order to investigate the high volume fraction problem of the solid phase in superfine unclassified backfilling pipeline transportation, characteristic parameters were obtained by fitting to test data with an R–R particle size distribution function; then, a Euler dense-phase DPM (Discrete phase model) model was established by applying solid–liquid two-phase flow theory and the kinetic theory ...

This study is concerned with the prediction of particles’ velocity in a dilute turbulent gas-solidboundary layer flow using a fully Eulerian two-fluid model. The closures required for equationsdescribing the particulate phase are derived from the kinetic theory of granular flows. Gas phaseturbulence is modeled by one-equation model and solid phase turbulence by MLH theory. Resultsof one-way and...

This study analyses the impact of particle polydispersity using Eulerian-Eulerian (EE) and Lagrangian-Eulerian (LE) modelling approaches in context wellbore cleaning operations drilling industry. Spherical particles sizes 0.5 mm, 0.75 mm 1 are considered, whereas a Power Law rheological model is used for fluid phase description. The EE approach implemented herein applies Kinetic Theory Granular...

Proppant transport is critical in hydraulic fractures and enhanced geothermal systems. essentially a dense granular flow narrow slots, the Euler–Euler methods are commonly used to study principle of proppant at field scale. However, simulated results cannot reproduce laboratory observations well because some closure equations not suitable for describing quasi-static state proppants after settle...

Gas hydrate (GH) is widely distributed in the world according to geological survey. Most of GH located ocean. After dissociation, strength gas bearing sediments (GHBS) decreases accompanying rise pore pressure, which can cause marine landslide. Landslide may transform into mudflows during movement on seabed. The massive submarine mudflow result serious deformation (or even damage of) pipelines,...

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These are notes prepared for presentation at the workshop ”Challenges in Granular Matter” at the Abdus Salam Institute for Theoretical Physics, Trieste, August 2001. Revisions and figures will be added at a later date. Many features of real granular fluids under rapid flow are replicated by a system of smooth hard spheres with inelastic collisions. For such a system, it is tempting to apply sta...

Many features of granular media can be modelled as a fluid of hard spheres with inelastic collisions. Under rapid flow conditions, the macroscopic behavior of grains can be described through hydrodynamic equations. At lowdensity, a fundamental basis for the derivation of the hydrodynamic equations and explicit expressions for the transport coefficients appearing in them is provided by the Boltz...