WAKE ARCHITECTURES IN TWO-DIMENSIONAL FLUIDIZATION OF SPHERES Experiments and phenomenogical description

Orr Sommerfeld Solver Using Mapped Finite Di?erence Scheme for Plane Wake Flow

Linear stability analysis of the three dimensional plane wake flow is performed using a mapped finite di?erence scheme in a domain which is doubly infinite in the cross–stream direction of wake flow. The physical domain in cross–stream direction is mapped to the computational domain using a cotangent mapping of the form y = ?cot(??). The Squire transformation [2], proposed by Squire, is also us...

outflow Boundary Codition Issues in Direct Numerical Simulation of Three- Dimensional Plane Wake Flow

Vertically shaken column of spheres. Onset of fluidization

The onset of surface fluidization of granular material in a vertically vibrated container, z = A cos (ωt), is studied experimentally. Recently, for a column of spheres it has been theoretically found [1] that the particles lose contact if a certain condition for the acceleration amplitude z̈ ≡ Aω/g = f(ω) holds. This result is in disagreement with other findings where the criterion z̈ = z̈crit = c...

Fluidization of Initialty Segregased Equidensity Binary System

Fluidization of initially segregated binary mixtures has been investigated for particle systems of the same material. This paper reports experiments conducted in 0.055m diameter fluidizes bed for binary mixtures composed of sands whose sizes ranged from 450 to 1450mm. An empirical relationship, Utf = 0.95 UF (dR)0.87, was derived in terms of the minimum fluidization of the smaller particle, UF ...

Interactions of the wakes of two spheres placed side by side

The periodic coupled wakes of two spheres, placed side by side in a uniform stream at low Reynolds numbers, are studied experimentally and by Direct Numerical Simulations. Distinctly different regimes of interaction are observed, depending on the separation distance between the spheres. For touching spheres, a single wake is found. At very small separations, it is shown through numerical simula...