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.

Manish K. Shukla, K. Avinash · 2019