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

Table 4

Summary of test data of the total amount of crystals in pipes of different running cycles under different electric field modes.

Electric field mode	Voltage value (V)	Total crystal amount in pipes
Running time		10 d	20 d	30 d	40 d	50 d
Circumferential electric field	5	1.86	2.31	2.83	3.72	4.07
	12	2.13	2.77	3.52	4.14	4.38
	24	2.78	3.23	3.82	4.48	4.93
Parallel plate electric field	5	1.99	2.61	3.12	3.72	3.85
	12	2.22	2.88	3.7	4.43	4.98
	24	2.09	3.09	3.97	4.67	5.09
Contrast groups		3.27	5.43	6.52	7.41	7.3