Abstract
Ventilation of mines in oilshale, limestone, stratiform lead—zinc, etc., involves the passing of air through large-size mine openings. The openings can be as large as 60 ft wide × 60 ft. high. In such openings, the mine air often flows in a stratified laminar form. Such air flow has significant variations in air velocity across the airway cross-section. Atkinson's formula, used widely to calculate air quantities and air velocities, cannot be used for such calculations when stratified airflow in large mine openings is involved. This paper attempts to develop mathematical models to calculate air velocity distributions in large mine openings. Two approaches have been used. The first approach considers streamline, steady state and incompressible flow of air. The second approach develops a thermo-dynamic model of air velocity distribution caused by buoyancy forces resulting from temperature inequalities.
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