In this chapter, permeability μ and resistivity ρ are treated as numbers in the depth-of-penetration formula δ=√(2ρ/μω) and the consequences of changing them are noted, using the theory that has been developed in earlier chapters, μ and ρ both change during heating, so this is important. However, before we consider them combined, we examine simple changes of each for the semi-infinite slab. Throughout this chapter, we only treat the constant-E condition for conduction (where E is the electric field strength).

Inspec keywords: electrical resistivity; permeability; induction heating

Other keywords: induction heating; conduction heating; resistivity effects; permeability effects; depth of penetration formula

Subjects: Process heating