What is the difference between induction heating and magnetic nanoparticle heating, and why should induction heaters be avoided for studying power loss (heating profile) of magnetic nanoparticles in AC magnetic fields?
Electromagnetic induction is a phenomenon of voltage production in a conductor when it is brought close to a time-varying magnetic field. In Induction heating, this electromagnetic induction principle is used to heat any matter with electrical conductivity due to joule heating (or resistance heating) as the induced current flows through the material.
An induction heating system consists of a solenoid coil, through which a high-frequency alternating current is passed, producing a magnetic field. Heat may also be generated by hysteresis losses in materials that have significant relative magnetic permeability.
The frequency of the AC used depends on the object size, material type, coupling (between the work coil and the object to be heated) and the penetration depth. Induction heating allows the targeted heating of any conductors in a solid, liquid or gaseous state, and is mostly used for preheating, post heating, straightening, tempering, hardening, annealing, bonding, melting, brazing, soldering, heating and welding applications.