Numerical Simulation of Coal Spontaneous Combustion around a Borehole Induced by Negative Pressure Gas Drainage

Figure 2

Cloud maps of the gas seepage velocity around a gas drainage borehole under suction pressures of (a) 18 kPa, (b) 23 kPa, (c) 30 kPa, and (d) 35 kPa.

(a)

(b)

(c)

(d)