Table 3 Influence of particle size and coal dust cloud mass concentration on explosion pressure and flame.

r (μm)	c (g/m³)	Explosion pressure and flame		r (μm)	c (g/m³)	Explosion pressure and flame
r (μm)	c (g/m³)	P_max (MPa)	l_max (m)	r (μm)	c (g/m³)	P_max (MPa)	l_max (m)
58 ~ 75	300	0.51	0.52	25 ~ 38	400	0.62	0.66
48 ~ 58	300	0.54	0.57	0 ~ 25	400	0.55	0.59
38 ~ 48	300	0.60	0.65	58 ~ 75	450	0.53	0.56
25 ~ 38	300	0.54	0.57	48 ~ 58	450	0.57	0.60
0 ~ 25	300	0.46	0.50	38 ~ 48	450	0.62	0.69
58 ~ 75	350	0.56	0.58	25 ~ 38	450	0.56	0.61
48 ~ 58	350	0.60	0.62	0 ~ 25	450	0.49	0.54
38 ~ 48	350	0.65	0.70	58 ~ 75	500	0.46	0.50
25 ~ 38	350	0.59	0.63	48 ~ 58	500	0.50	0.55
0 ~ 25	350	0.52	0.56	38 ~ 48	500	0.55	0.64
58 ~ 75	400	0.59	0.61	25 ~ 38	500	0.49	0.56
48 ~ 58	400	0.63	0.65	0 ~ 25	500	0.43	0.50
38 ~ 48	400	0.68	0.74	–	–	–	–

r particle size of coal dust, c coal dust cloud mass concentration, P_max maximum pressure, l_max maximum flame length.

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