On turbulent diffusion coefficient concerning flow of air and gas in mine working

Author: S. Wasilewski

The article presents the experiments of gas disturbances propagation in a mine ventilation network.

The main purpose of the investigation was estimation of a turbulent diffusion coefficient.

Calculations were made for measuring signals recorded during the propagation of methane, carbon monoxide and smoke concentration disturbances in mine workings.

Disturbances of methane caused by changes in ventilation conditions after auxiliary fan switching-off and shooting in longwall were treated as natural gas markers recorded in the different points of mines along ventilation paths.

The turbulent diffusion coefficient was also calculated for smoke signals recorded during burning experiments in experimental workings and for carbon monoxide concentration signals recorded after shooting in mine workings.

The diffusion coefficient was calculated using the various methods and comparing the obtained results.