This paper presents the results of two models built to study the leakage flow in underground coal mines. The first is a laboratory model designed to characterize leakage flow paths such as stoppings, overcasts, doors, and regulators. The second is an analysis of air leakage in a 2-entry system using CFD. The results of the lab model show that a direct application of the square law to the laboratory readings yields resistances that are orders of magnitude greater than those obtained from field measurements. The results of both studies indicate that the pressure drop across stoppings follow a decay function rather than a linear one. The results also indicate that 50-60% of total leakage occurs in the first 40% of the mine workings.
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