arXiv subjects

Manish K. Shukla

Publications and source records attributed to Manish K. Shukla.

3 recordsLinked to original sources

arXiv2019

Free Expansion of Yukawa Gas in the Constant Plasma Background

We discuss the irreversible free expansion phenomenon for Yukawa gas and obtain the corresponding change in temperature of the gas. In our expansion scheme, the system is not allowed to exchange heat with surroundings during free expansion, therefore, present expansion scheme refers to adiabatic free expansion. Using first principle classical Molecular Dynamics (MD) simulation with reflecting boundary conditions, we show that the Yukawa gases exhibits heating effect during the process of adiabatic free expansion. We also obtain the scaling for change in temperature and establish that the change in temperature is directly proportional to the change in number density of gas. The scaling for temperature is also obtained analytically taking the mean field limit of thermodynamic model proposed by Avinash. The simulation results are consistent with the analytical results.

physics.plasm-ph↗

arXiv2019

Isothermal Equation of State of Three Dimensional Yukawa Gas

Molecular Dynamics (MD) simulation is carried out to examine the effect of particle confinement on the pressure of 3D Yukawa gas. Confinement effects are taken into account by using perfectly reflecting boundary condition in MD simulations. An equation of state relating pressure to number density is obtained. The results of the MD simulations show that in weak coupling regime pressure of confined Yukawa gas is much bigger than the kinetic pressure and scales quadratically with number density. Results are compared with earlier theories and experiments which show quadratic scaling of dust pressure with density.

physics.plasm-ph↗

arXiv2019

Equilibrium configuration of self-gravitating charged dust clouds: Particle approach

A three dimensional Molecular Dynamics (MD) simulation is carried out to explore the equilibrium configurations of charged dust particles. These equilibrium configuration are of astrophysical significance for the conditions of molecular clouds and the interstellar medium. The interaction among the dust grains is modeled by Yukawa repulsion and gravitational attraction. The spherically symmetric equilibria are constructed which are characterized characterized by three parameters: (i) the number of particles in the cloud, (ii) $Γ_g$ (defined in the text) where $Γ_g^{-1}$ is the short range cutoff of the interparticle potential, and (iii) the temperature of the grains. The effects of these parameters on dust cloud are investigated using radial density profile. The problem of equilibrium is also formulated in the mean field limit where total dust pressure which is the sum of kinetic pressure and electrostatic pressure, balances the self-gravity. The mean field solutions agree well with the results of MD simulations. Astrophysical significance of the results is briefly discussed.

physics.plasm-ph↗