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It is shown that the method of reflections in resistance form ͑with truncated multipoles͒ is one of many possible iterative methods to obtain the inverse of the mobility matrix ͑with the same truncation͒ in low-Reynolds-number hydrodynamics. Although the method of reflections in the mobility form is guaranteed to converge, it is found that in the resistance… (More)

A numerical simulation of a gas-fluidized bed is performed without introduction of any empirical parameters. Realistic bubbles and slugs are observed in our simulation. It is found that the convective motion of particles is important for the bubbling phase and there is no convection in the slugging phase. From the simulation results, non-Gaussian… (More)

Systematic simulations are carried out based on the model of fluidized beds proposed by the present authors [K. From our simulation, we confirm that fluidization is a continuous transition. We also confirm the existence of two types of fluidized phases, the channeling phase and the bubbling phase. We find the close relations between the averaged behaviors… (More)

- Kengo Ichiki, Styliani Consta
- The journal of physical chemistry. B
- 2006

The mechanism of fragmentation processes in aqueous nanodroplets charged with ions is studied by molecular dynamics (MD) simulations. By using constant-temperature MD, the evaporation of the water is naturally taken into account and sequences of ion fragmentation events are observed. The size of the critical radius of the charged droplet just before the… (More)

- Kengo Ichiki
- 1995

Granular flows in a narrow pipe are studied numerically by the model taking account of hydrodynamic effects of fluid surrounding particles. In the simulations density waves are observed over the wide range of the Stokes number, which represents the inertial effect of particles. The mechanisms of formation of the density waves are considered and two types of… (More)

An analytical treatment for the sedimentation rate of disordered suspensions is presented in the context of a resistance problem. From the calculation it is confirmed that the lubrication effect is important in contrast to the suggestion by Brady and Durlofsky (Phys.Fluids 31, 717 (1988)). The calculated sedimentation rate agrees well with the experimental… (More)

- Quan Zhang, Kengo Ichiki, Andrea Prosperetti
- J. Comput. Physics
- 2006

When there is no clear separation between micro-and macro-scales, ergodicity cannot be invoked to transform ensemble into volume averages. In such cases it is necessary to use ensemble averaging directly. The calculation of such averages, however, converges slowly and therefore requires a large number of realizations of the system. This paper describes a… (More)

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