Numerical Study on Infrared Optical Property of Diffuse Coal Particles in Mine Fully Mechanized Working Combined with CFD Method

Table 6

Transmittance variation of dust in vertical direction.

Distance (m)	Height (m)	Transmittance
		Short wave (2 m)		Medium wave (5 m)		Long wave (20 m)
		Respirable dust	Total dust	Respirable dust	Total dust	Respirable dust	Total dust
5	0.5	0.3189	0.1856	0.6658	0.2766	0.7809	0.5355
	1.5	0.2289	0.1438	0.6374	0.2993	0.7317	0.5302
	2	0.601	0.5361	0.8392	0.6952	0.8961	0.8293
15	0.5	0.3219	0.2653	0.7068	0.5162	0.7864	0.6877
	1.5	0.2704	0.2079	0.6722	0.4375	0.758	0.6325
	2	0.5638	0.4997	0.8447	0.6925	0.8861	0.8165
25	0.5	0.5696	0.5123	0.8514	0.7155	0.8884	0.8264
	1.5	0.4446	0.4054	0.7936	0.6819	0.8434	0.7918
	2	0.5332	0.4799	0.8474	0.7124	0.8773	0.8165