Abstract
SUMMARY Airflow in airways established in bord and pillar workings courses through relatively uniform rectangular conduits for portions of its flowpath, but is repeatedly subjected to abrupt expansions and contractions where longitudinal roads intersect transverse crosscuts. Despite widespread use of bord and pillar mining methods, particularly for the exploitation of flat and shallow coal seams, the aerodynamic resistance of airways in bord and pillar workings has historically received less attention than other aspects of mine airflow. The paper reviews some of the more important geometric factors that may affect the ventilation resistance of bord and pillar airways, and discusses some preliminary findings from a series of 1:100 scale model tests undertaken with a view to quantifying some of the geometric variables.
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