The problem of gas hydrate formation in a closed volume saturated with gas and snow

V. Sh. Shagapov ; A. S. Chiglintseva ; S. V. Belova

Vestnik Tomskogo gosudarstvennogo universiteta. Matematika i mehanika, no. 46 (2017), pp. 86-101

Résumé

The problem of gas hydrate formation in a closed volume initially saturated with snow and gas is considered. The scheme accepted for the kinetics of hydrate formation supposes that the gas diffuses through the hydrate layer between the gas and ice (or water) phases to the ice (or water)–hydrate interface. This scheme also allows one to describe the process of hydrate formation by introducing only one parameter, namely, the reduced diffusion coefficient which can take different values depending on the quality and state of the ice, as well as "purity" of the hydrateforming gas. In this connection, the obtained solutions demonstrate that the distributions of main parameters depend on the dimensionless time and do not depend on the reduced diffusion coefficient. It is shown that at the various stages of the ice state (at negative or positive temperatures and melting point of ice), the hydrate formation can occur depending on the initial snow saturation.

Détail

Keywords: hydrate formation, closed volume, hydrate saturation, snow saturation, icy particles, reduced coefficient of gas diffusion, «gas+snow» system.