Related Experiment Video
Updated: Aug 16, 2025

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
Auto-correlations of microscopic density fluctuations for Yukawa fluids in the generalized hydrodynamics framework
Ankit Dhaka1,2, P V Subhash3,4, P Bandyopadhyay5,3
1Institute for Plasma Research, Bhat, Gandhinagar, Gujarat, 382428, India. dhaka.nitrkl@gmail.com.
Abstract:
The present work develops a theoretical procedure for obtaining transport coefficients of Yukawa systems from density fluctuations. The dynamics of Yukawa systems are described in the framework of the generalized hydrodynamic (GH) model that incorporates strong coupling and visco-elastic memory effects by using an exponentially decaying memory function in time. A hydrodynamic matrix for such a system is exactly derived and then used to obtain an analytic expression for the density autocorrelation function (DAF)-a marker of the time dynamics of density fluctuations. The present approach is validated against a DAF obtained from numerical data of Molecular Dynamics (MD) simulations of a dusty plasma system that is a practical example of a Yukawa system. The MD results and analytic expressions derived from the model equations are then used to obtain various transport coefficients and the latter are compared with values available in the literature from other models. The influence of strong coupling and visco-elastic effects on the transport parameters are discussed. Finally, the utility of our calculations for obtaining reliable estimates of transport coefficients from experimentally determined DAF is pointed out.
More Related Videos
10:28Experimental Measurement of Settling Velocity of Spherical Particles in Unconfined and Confined Surfactant-based Shear Thinning Viscoelastic Fluids
Published on: January 3, 2014
06:37Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
Published on: September 17, 2021
Related Concept Videos
Viscosity of Fluid
Dimensionless Groups in Fluid Mechanics
Pressure Variation in a Fluid at Rest
When measuring pressure at two different levels within the fluid, the difference in...
Correlation of Experimental Data
For example, a spherical particle moving through a viscous fluid experiences drag. Dimensional analysis shows that the drag force depends on the particle's diameter, velocity,...
Generalized Hooke's Law
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity