Brownian motion of dust particles in a weakly ionized plasma

Фортов, В. Е.; Петров, О. Ф.; Ваулина, О. С.; Koss, K. G.

doi:10.1134/s0021364013060040

Cited by 24 publications

(16 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Working with a grand canonical ensemble, virial corrections have been taken into account due to charge-charge interactions (Debye approximation). Short-range repulsion of heavy particles was considered within the framework of a soft sphere model [18][19][20]. In the parameter range of the shock wave experiments, the composition was obtained with an error of up to 15%, depending on the approximations for the equation of state.…”

Section: Measurement Technique and Experimental Datamentioning

confidence: 99%

Optical Reflectivity of Xenon Plasma Revisited

Zaporozhets

Omarbakiyeva

Reinholz

et al. 2016

Contrib. Plasma Phys.

View full text Add to dashboard Cite

Newly obtained experimental data for the reflectivity of Xenon plasmas at pressures of 10‐12 GPa at large incident angles are analyzed. Using a Fermi‐like density profile along the shock wave front, the reflectivity coefficients for the s and p ‐ polarized waves were calculated. The influence of atoms which were taken into account at the level of collision frequency unique density prove to be crucial for the understanding of the reflection process. Subsequently, as physically expected, a profile is sufficient to obtain good agreement with the experimental data at all investigated optical laser frequencies. (© 2016 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

show abstract

Section: Measurement Technique and Experimental Datamentioning

confidence: 99%

Optical Reflectivity of Xenon Plasma Revisited

Zaporozhets

Omarbakiyeva

Reinholz

et al. 2016

Contrib. Plasma Phys.

View full text Add to dashboard Cite

show abstract

“…∇ ri · D Br · −βK int i + ∇ rj g(r, t) , (1) where D Br is the microscopic diffusion matrix which describes the influence of the medium on particles moving under Brownian dynamics , K int i is the force acting on the i-th particle due to the pair-wise interactions with the other N −1 particles, and β = 1/k B T with k B being the Boltzmann constant and T the absolute temperature. Equation (1) has been adopted to study the influence of Brownian motion and inter-particle interactions on the micro-structure of colloidal suspensions [3] or dusty plasmas [4]. However, considerable less information and understanding are available for colloidal systems that are subject to a laminar shear flow, in spite of the great of importance of this situation for industrial applications [5], complex plasmas [6] and atmospheric science [7].…”

Section: Introductionmentioning

confidence: 99%

Pair correlation function of charge-stabilized colloidal systems under sheared conditions

Banetta¹,

Zaccone²

2020

Colloid Polym Sci

View full text Add to dashboard Cite

The pair correlation function of charge stabilized colloidal particles under strongly sheared conditions is studied using the analytical intermediate asymptotics method recently developed in [L. Banetta and A. Zaccone, Phys. Rev. E 99, 052606 (2019)] to solve the steady-state Smoluchowski equation for medium to high values of the Péclet number; the analytical theory works for dilute conditions. A rich physical behaviour is unveiled for the pair correlation function of colloids interacting via the repulsive Yukawa (or Debye-Hückel) potential, in both the extensional and compressional sectors of the solid angle. In the compression sector, a peak near contact is due to the advecting action of the flow and decreases upon increasing the coupling strength parameter Γ of the Yukawa potential. Upon increasing the screening (Debye) length κ −1 , a secondary peak shows up, at a larger separation distance, slightly less than the Debye length. While this secondary peak grows, the primary peak near contact decreases. The secondary peak is attributed to the competition between the advecting (attractive-like) action of the flow in the compressions sector, and the repulsion due to the electrostatics. In the extensional sectors, a depletion layer (where the pair-correlation function is identi-

show abstract

“…In our dust trap, the gradients of the grain charge and electric field play an important role. It is known [18,19] that the presence of a grain charge gradient and a nonelectric force acting perpen dicularly to this gradient should lead to the appearance of vortices. The grains move along the force in the region where their charge is minimum and against the force in the region where their charge is maximum.…”

Section: Resultsmentioning

confidence: 99%

“…A characteristic feature of the trap is that its electric characteristics are highly inho mogeneous. The dust structure has a number of prop erties characteristic of three dimensional structures formed in glow and other discharges, such as the pres ence of dust acoustic instability [16,17] and instabil ity caused by the gradient of the grain charge [18][19][20]. In the course of dust structure formation, the plasma selects dust grains by size, density, and form factor.…”

Section: Introductionmentioning

confidence: 99%

Properties of dust-plasma structures formed in a glow discharge above the lower wall of the discharge chamber

2012

View full text Add to dashboard Cite

The properties are studied of dusty plasma structures formed in a glow discharge in a dust trap above the lower wall of the side branch of the discharge tube, near the turn of the discharge channel. The dust structure is three dimensional with a characteristic size of up to 3 cm and contains about 30000 dust grains. Depending on the experimental conditions, dust acoustic, dissipative, and charge gradient instabilities can develop in such a structure. When using highly polydisperse dust grains of arbitrary shape, the effect of selec tion of dust grains by the plasma with respect to their mean size and shape was discovered. This effect was studied quantitatively in two gases by using the method of gathering and extraction of the dust grains levitating in the trap. The morphology of the dust structures was determined from the pair correlation functions of the horizontal cross sections containing long range order peaks and elements of a hexagonal lattice. Stratifica tion of a uniform structure accompanied by convective rotation caused by the grain charge gradient was observed. Applications of the dusty plasma created in this type of device are discussed.

show abstract

Brownian motion of dust particles in a weakly ionized plasma

Cited by 24 publications

References 14 publications

Optical Reflectivity of Xenon Plasma Revisited

Optical Reflectivity of Xenon Plasma Revisited

Pair correlation function of charge-stabilized colloidal systems under sheared conditions

Properties of dust-plasma structures formed in a glow discharge above the lower wall of the discharge chamber

Contact Info

Product

Resources

About