Table 1. Penetration criteria for different-layered mask A for different impact velocities and droplet size of ~620 μm.

The red (top left) and green (bottom right) regions indicate the cases of droplet penetration and no penetration through the mask, respectively.

	Single layer	Double layer	Triple layer
Reε (ε/tm) at Vi = 10 m/s	27.22	4.37	1.45
Reε (ε/tm) at Vi = 7.5 m/s	20.42	3.28	1.09
Reε (ε/tm) at Vi = 5 m/s	13.61	2.19	0.73
Reε (ε/tm) at Vi = 3 m/s	8.17	1.31	0.44
Reε (ε/tm) at Vi = 2 m/s	5.45	0.87	0.29