Multifield Coupled Dynamic Simulation of Coal Oxidation and Self-Heating in Longwall Coal Mine Gob

Table 3

Numerical simulation parameters.

	Parameter	Value
Inlet wind velocity		1.7 m·s^−1
Reaction order	n	1
Preexponential factor	A	0.424 s^−1
Activation energy	E	21.9 kJ·mol^−1
Initial temperature of the surrounding rock		17°C
Air density	ρf	1.1 kg·m^−3
Heat conduction coefficient of air		0.026 W·m^−1·K^−1
Specific heat of air	cp	1012 J·kg^−1·K^−1
Air inlet temperature	Tin	17°C
Oxygen concentration in the inlet of airflow	C0	9.375 mol·m^−3
Heat of oxidation reaction	ΔH	400 kJ·mol^−1
Oxygen diffusion coefficient	D	2 × 10^−5 m^2·s^−1
Density of coal gangue	ρs	1300 kg·m^−3
Heat conduction coefficient of coal gangue		0.2 W·m^−1·K^−1
Specific heat of coal gangue	c	1003 J·kg^−1·K^−1
Dynamic viscosity	μ	1.84 × 10^5 Pa·s