Particle Interactions in Plasmas

In the present study, bubble-particle interactions in suspensions are investigated by a coupled immersed-boundary and volume-of-fluid method (IB-VOF method), which is proposed by the present authors. The validity of the numerical method is examined through simulations of a rising bubble in a liquid and a falling particle in a liquid. Dilute particle-laden flows and a gas-liquid-solid flow involving solid particles and bubbles of comparable sizes to one another (Db/Dp = 1) are simulated. Drag coefficients of particles in particle-laden flows are estimated and flow fields involving multiple particles and a bubble are demonstrated.

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An investigation of the effect of the particle–fluid and particle–particle interactions on the flow within a hydrocyclone

Chemical Engineering Journal ◽

10.1016/j.cej.2005.02.022 ◽

2005 ◽

Vol 111 (2-3) ◽

pp. 189-197 ◽

Cited By ~ 37

Author(s):

W. Kraipech ◽

A. Nowakowski ◽

T. Dyakowski ◽

A. Suksangpanomrung

Keyword(s):

Particle Interactions

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General dispersion properties of magnetized plasmas with drifting bi-Kappa distributions. DIS-K: Dispersion Solver for Kappa Plasmas

Journal of Plasma Physics ◽

10.1017/s0022377821000593 ◽

2021 ◽

Vol 87 (3) ◽

Author(s):

R.A. López ◽

S.M. Shaaban ◽

M. Lazar

Keyword(s):

Dominant Role ◽

High Energy ◽

Distribution Functions ◽

Magnetized Plasma ◽

Unstable Wave ◽

Space Plasmas ◽

Good Representation ◽

Particle Interactions ◽

Particle Collisions ◽

Dispersion Tensor

Space plasmas are known to be out of (local) thermodynamic equilibrium, as observations show direct or indirect evidences of non-thermal velocity distributions of plasma particles. Prominent are the anisotropies relative to the magnetic field, anisotropic temperatures, field-aligned beams or drifting populations, but also, the suprathermal populations enhancing the high-energy tails of the observed distributions. Drifting bi-Kappa distribution functions can provide a good representation of these features and enable for a kinetic fundamental description of the dispersion and stability of these collision-poor plasmas, where particle–particle collisions are rare but wave–particle interactions appear to play a dominant role in the dynamics. In the present paper we derive the full set of components of the dispersion tensor for magnetized plasma populations modelled by drifting bi-Kappa distributions. A new solver called DIS-K (DIspersion Solver for Kappa plasmas) is proposed to solve numerically the dispersion relations of high complexity. The solver is validated by comparing with the damped and unstable wave solutions obtained with other codes, operating in the limits of drifting Maxwellian and non-drifting Kappa models. These new theoretical tools enable more realistic characterizations, both analytical and numerical, of wave fluctuations and instabilities in complex kinetic configurations measured in-situ in space plasmas.

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