PIV investigations on particle velocity distribution in uniform swirling regime of fluidization

2017 ◽  
Vol 19 (2) ◽  
Author(s):  
M. Y. Naz ◽  
S. A. Sulaiman ◽  
S. Shukrullah ◽  
A. Ghaffar ◽  
Y. Khan ◽  
...  
Keyword(s):  
Velocity Distribution ◽  
Particle Velocity

Analysis of Electron and Heavy Particle Velocity Distribution under Consideration of Non-thermal Equilibrium Arc

2019 ◽  
Vol 139 (9) ◽  
pp. 562-567
Author(s):  
Yusuke Nemoto ◽  
Soshi Iwata ◽  
Yoshifumi Maeda ◽  
Toru Iwao
Keyword(s):  
Velocity Distribution ◽  
Particle Velocity ◽  
Thermal Equilibrium ◽  
Heavy Particle

scholarly journals Analysis of electron and heavy particle velocity distribution under consideration of nonthermal equilibrium arc

2019 ◽  
Vol 102 (11) ◽  
pp. 9-15
Author(s):  
Yusuke Nemoto ◽  
Soshi Iwata ◽  
Yoshifumi Maeda ◽  
Toru Iwao
Keyword(s):  
Velocity Distribution ◽  
Particle Velocity ◽  
Heavy Particle

Landau damping for non-Maxwellian distributions

1962 ◽  
Vol 58 (1) ◽  
pp. 119-129 ◽  
Author(s):  
John F. P. Hudson
Keyword(s):  
Distribution Function ◽  
Velocity Distribution ◽  
Particle Velocity ◽  
Velocity Distribution Function ◽  
Landau Damping ◽  
Longitudinal Waves ◽  
Maxwellian Plasma ◽  
Maximum Particle ◽  
General Distributions ◽  
Uniform Plasma

ABSTRACTIt has been shown by Landau(8) that in a uniform plasma with a Maxwelliau velocity distribution longitudinal waves are damped. Penrose(9) has considered more general distributions and developed stability criteria. In particular, if the velocity distribution function has only one maximum, then the plasma is stable. In this paper the values of the Landau damping for some stable single maximum distributions are compared in order to assess the sensitivity of Landau damping to the form of the distribution function, and to investigate the usefulness of approximating to the Landau damping in a Maxwellian plasma by using an algebraically simpler velocity distribution function.It is shown also that, for at least some velocity distributions having a maximum particle velocity, the behaviour of the plasma can no longer be described in terms of exponential damping, since there will be longer lasting perturbations with phase velocity equal to the maximum particle velocity.

A High-Order Accurate Gas-Kinetic Scheme for One- and Two-Dimensional Flow Simulation

2014 ◽  
Vol 15 (4) ◽  
pp. 911-943 ◽  
Author(s):  
Na Liu ◽  
Huazhong Tang
Keyword(s):  
Velocity Distribution ◽  
Particle Velocity ◽  
Fourth Order ◽  
Velocity Distribution Function ◽  
Kinetic Scheme ◽  
High Order ◽  
Third Order ◽  
Quartic Polynomial ◽  
Two Dimensional Flow ◽  
Cell Interface

AbstractThis paper develops a high-order accurate gas-kinetic scheme in the framework of the finite volume method for the one- and two-dimensional flow simulations, which is an extension of the third-order accurate gas-kinetic scheme [Q.B. Li, K. Xu, and S. Fu, J. Comput. Phys., 229(2010), 6715-6731] and the second-order accurate gas-kinetic scheme [K. Xu, J. Comput. Phys., 171(2001), 289-335]. It is formed by two parts: quartic polynomial reconstruction of the macroscopic variables and fourth-order accurate flux evolution. The first part reconstructs a piecewise cell-center based quartic polynomial and a cell-vertex based quartic polynomial according to the “initial” cell average approximation of macroscopic variables to recover locally the non-equilibrium and equilibrium single particle velocity distribution functions around the cell interface. It is in view of the fact that all macroscopic variables become moments of a single particle velocity distribution function in the gas-kinetic theory. The generalized moment limiter is employed there to suppress the possible numerical oscillation. In the second part, the macroscopic flux at the cell interface is evolved in fourth-order accuracy by means of the simple particle transport mechanism in the microscopic level, i.e. free transport and the Bhatnagar-Gross-Krook (BGK) collisions. In other words, the fourth-order flux evolution is based on the solution (i.e. the particle velocity distribution function) of the BGK model for the Boltzmann equation. Several 1D and 2D test problems are numerically solved by using the proposed high-order accurate gas-kinetic scheme. By comparing with the exact solutions or the numerical solutions obtained the second-order or third-order accurate gas-kinetic scheme, the computations demonstrate that our scheme is effective and accurate for simulating invisid and viscous fluid flows, and the accuracy of the high-order GKS depends on the choice of the (numerical) collision time.

Particle velocity distribution in a flow of gas-solid mixture through a horizontal channel

2016 ◽  
Vol 298 ◽  
pp. 119-129 ◽  
Author(s):  
A. Deshmukh ◽  
V. Vasava ◽  
A. Patankar ◽  
M. Bose
Keyword(s):  
Velocity Distribution ◽  
Particle Velocity ◽  
Horizontal Channel ◽  
Solid Mixture

Particle velocity distribution function around a single bubble in gas-solid fluidized beds

2020 ◽  
Vol 361 ◽  
pp. 33-44 ◽  
Author(s):  
Runjia Liu ◽  
Zongyan Zhou ◽  
Rui Xiao ◽  
Mao Ye ◽  
Aibing Yu
Keyword(s):  
Distribution Function ◽  
Velocity Distribution ◽  
Particle Velocity ◽  
Fluidized Beds ◽  
Velocity Distribution Function ◽  
Single Bubble
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