Elastic Properties of Porous Media Containing Gas Hydrates

Electronic and Vibratonal Properties of Gas Hydrates

INTRODUCTION The most unique physical property of gas hydrate is the anomalous low and unexpected glassy-like thermal conductivity [ I ,2]. This interesting behaviour has both significant practical and scientific consequences. Thermal conductivity is a vital parameter required for the computer modelling of the recovery of natural gas from the hydrate [3]. A knowledge on the variation of the the...

Elastic properties of model porous ceramics ∗

The finite element method (FEM) is used to study the influence of porosity and pore shape on the elastic properties of model porous ceramics. The Young’s modulus of each model was found to be practically independent of the solid Poisson’s ratio. At a sufficiently high porosity, the Poisson’s ratio of the porous models converged to a fixed value independent of the solid Poisson’s ratio. The Youn...

Nucleation of gas hydrates

The kinetics of nucleation of one-component gas hydrates in aqueous solutions are analyzed. The size of the hydrate nucleus and the work for nucleus formation are determined as functions of the supersaturation Dm: Expressions for the stationary rate J of hydrate nucleation are derived. These expressions describe the JðDmÞ dependence for homogeneous nucleation and for heterogeneous nucleation at...

Hydrates of Natural Gas

Probing porous media with gas diffusion NMR.

We show that gas diffusion nuclear magnetic resonance (GD-NMR) provides a powerful technique for probing the structure of porous media. In random packs of glass beads, using both laser-polarized and thermally polarized xenon gas, we find that GD-NMR can accurately measure the pore space surface-area-to-volume ratio, S/V rho, and the tortuosity, alpha (the latter quantity being directly related ...