Figure 8

The critical magnetic induction (Bcr) as a function of wall roughness (WR) for real Reynolds numbers (Re*), (a): f = 50 Hz, (b): f = 150 Hz.

The critical magnetic induction (Bcr) as a function of wall roughness (WR) for real Reynolds numbers (Re*), (a): f = 50 Hz, (b): f = 150 Hz.