Optimal Nozzle Structure for an Abrasive Gas Jet for Rock Breakage

Table 1

Maximum erosion rate of different nozzles at various pressures.

Nozzle	Erosion rate (×10^−7 kg/m^2·s)
	10 MPa	15 MPa	20 MPa	25 MPa	30 MPa	50 MPa
Mach 2	10.9	12.5	19.3	79.2	10.7	4.56
Mach 3	13.1	24.3	60.6	126	15.7	2.95
Mach 4	15.1	13.4	17.2	13.5	16.3	7.17
Mach 5	13.0	7.27	16.1	65.5	12.8	4.56