Molecular dynamics simulations of Lennard-Jones systems are performed to study the effects of dissolved gas on liquid-wall and liquid-gas interfaces. Gas enrichment at walls, which for hydrophobic walls can exceed more than 2 orders of magnitude when compared to the gas density in the bulk liquid, is observed. As a consequence, the liquid structure close to the wall is considerably modified, le...

Sonoluminescence is the phenomena of light emission from a collapsing gas bubble in a liquid. Theoretical explanations of this extreme energy focusing are controversial and difficult to validate experimentally. We propose to use molecular dynamics simulations of the collapsing gas bubble to clarify the energy focusing mechanism, and provide insight into the mechanism of light emission. In this ...

The dynamics and velocity distributions for a 2D granular gas of nonspherical particles are studied experimentally. The experiment consists of a horizontal plate that is vertically shaken to drive the dynamics of up to a few thousand macroscopic dimers, spherical pairs that are loosely connected by a rod that allows the particles some freedom to change their aspect ratio. The behavior of a gran...

Based on the analysis of principle and structure of the gas booster, this paper studied on its charging process from low-pressure gas bottle to high-pressure one, considered the effect of some facts, including the changing of inlet and outlet pressure, clearance space, friction, according to the principle of kinematics, gas dynamics and thermodynamics ,established the mathematical and dynamics ...

The mixing behaviors of dry and wet granular materials in gas fluidized bed systems were investigated computationally using the combined Computational Fluid Dynamics and Discrete Element Method (CFD-DEM). Dry particles were observed to mix fairly rapidly during the fluidization process due to vigorous relative motions between particles induced by the flow of gas. In contrast, due to the presenc...

A sample of 197 X-ray emitting clusters of galaxies is considered in the context of Milgrom’s modified Newtonian dynamics (MOND). It is shown that the gas mass, extrapolated via an assumed β model to a fixed radius of 3 Mpc, is correlated with the gas temperature as predicted by MOND (Mg ∝ T ). The observed temperatures are generally consistent with the inferred mass of hot gas; no substantial ...

This paper is concerned with a mathematical and numerical study of the effect of gas entrapment on liquid dynamics in a closed-end horizontal capillary. This problem is important in order to understand how the presence of a gas inside the capillary can influence the dynamics of capillary flows and the non destructive test procedures carried out through liquid penetrant testing. In this context,...

We present evidence for cosmological gas accretion onto spiral galaxies in the local universe. The accretion is seen through its effects on the dynamics of the extra-planar neutral gas. The accretion rates that we estimate for two nearby spiral galaxies are of the order of their star formation rates. Our model shows that most of the extra-planar gas is produced by supernova feedback (galactic f...