Study of Electric Field Impact on Crystallization in Tunnel Drainage Pipes in Hard Water Area

Table 1

Summary of test parameters.

Test control items	Control parameter
Pipe length	1.2 m
Current speed in pipe	0.68 m/s (full-current)
	0.3 (semi-current)
Output voltage	5 V/12 V/24 V
Current state inside pipe (CO2contact areas)	Full-/semi-current
Slope gradient	0 (not set)