Oxygen Distribution and Air Leakage Law in Gob of Working Face of U+L Ventilation System

Table 1

Simulation parameter settings.

Category	Setting conditions
Boundary condition	AB, Velocity-inlet,; Intake is air, wind speed v=1.39m/s, T=25°C
	CD, Velocity-inlet,; Intake is air, wind speed v=1.72m/s, T=25°C
	EF, outflow
	GH, outflow
Coal wall in Gob	Non-slip velocity condition, u=v=0
Caving roof rock mass	Porosity, p=0.2
Sealing wall in connecting tunnel	Air leakage coefficient, m=0.1
Porosity of floating coal, Oxygen consumption rate	User Defined Functions (UDF) [15, 16]