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

Table 5

The attenuation coefficient variation of dust in vertical direction.

Distance (m)	Height (m)	Attenuation coefficient (m^−1)
		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	0.3007	0.443177	0.107077	0.338284	0.06505	0.164312
	1.5	0.388	0.510316	0.118485	0.317494	0.08223	0.167009
	2	0.134	0.164073	0.046133	0.095648	0.02885	0.049264
15	0.5	0.2982	0.349042	0.091317	0.174017	0.06323	0.098513
	1.5	0.3442	0.413359	0.104511	0.217504	0.07289	0.120512
	2	0.1508	0.182536	0.044426	0.096703	0.03181	0.053326
25	0.5	0.14815	0.176031	0.04233	0.08807	0.03114	0.050194
	1.5	0.21324	0.237569	0.060843	0.100763	0.04482	0.061438
	2	0.16547	0.193223	0.043609	0.089247	0.03446	0.053331