Some background... I have heard that Rossi is using a commercial plastic extrusion nozzle. These nozzles all use inductive high-frequency alternating current (AC). I will be looking to verify this from a direct Q&A from Rossi.
On Mon, Apr 18, 2011 at 4:03 PM, Roarty, Francis X < francis.x.roa...@lmco.com> wrote: > Axil, > > both resistive and inductive heaters will produce magnetic fields – A > resistive heater can operate on AC or DC but an inductive heater will short > out if fed DC. The resistive heater is still equivalent to a conductor which > will produce an ac or pulsating dc magnetic field if you choose to feed it > with such a waveform and I think that is what we want to use. An inductive > heater is essentially a coil which will develop a counter EMF that rounds > off your pulse (choking current) while the resistive heater will give you a > current waveform with a sharper rise time which is what you want since you > are endorsing this much faster field propagation as opposed to thermal > propagation to explain the control loop – and I concur. > > Regards > > Fran > > > > *From:* Axil Axil [mailto:janap...@gmail.com] > *Sent:* Monday, April 18, 2011 3:53 PM > *To:* vortex-l@eskimo.com > *Subject:* EXTERNAL: Re: [Vo]: resistive heaters not for heating? > > > > To the best of my knowledge, induction h eating is the process of heating > electrically conducting object (magnetic types of stainless steel but not > non magnetic copper) by electromagnetic induction where eddy currents are > generated within the metal and resistance leads to Joule heating of the > metal. An induction heater (for any process) consists of an electromagnet, > through which a high-frequency alternating current (AC) is passed. Heat may > also be generated by magnetic hysteresis losses in materials that have > significant relative permeability. The frequency of AC used depends on the > object size, material type, coupling (between the work coil and the object > to be heated) and the penetration depth. > > > > The magnetic field will pass thought non magnetic materials like copper, > aluminum, electrical wire insulation or glass without being effected and > terminate within magnetic materials. > > > > The copper inductive coils i n the Rossi reactor probably lie under the > inclosing copper header pipe and wrap around the RV. > > > > > > > > On Mon, Apr 18, 2011 at 3:15 PM, .:.gotjosh <ene...@begreen.nu> wrote: > > axil, please forgive me if these are ignorant questions: are you sure that > the heating elements are "inductive"? isn't there a difference between > inductive heating and resistive heating? Isn't it true that inductive > heating will not work with copper? > > > > On Mon, Apr 18, 2011 at 21:05, Axil Axil <janap...@gmail.com> wrote: > > > > The current producing the inductive heating will flow primarily on the > outside surface of the stainless steel reaction vessel (RV) wall due to the > skin effect. Little or a reduced current will flow on the inside surface of > the RV wall. No magnetic field will exist on the inside of the RV where the > hydrogen is pressurized. > > > > The magnetic field lines will be parallel to the circumference of the RV > cylinder causing the heating current to flow along the skin of the RV. This > is prescribed by the right hand rule. > > > > The will be a large negative electrostatic field produced by the flowing > electrons which form the inductive heating current. This negative current > charge will attract the positive hydrogen ions into the oxygen vacancies on > the nickel oxide powder lying on the inside surface of the RV wall. > > > > This attractive force will supplement the force exerted by the > electronegative oxygen atoms within the NiO at or very near the inner > surface of the RV wall. > > > > At startup, the induced current will be substantial at about 10 amps. > > > > > > > > > > On Mon, Apr 18, 2011 at 2:03 PM, .:.gotjosh <ene...@begreen.nu> wrote: > > Hey Mark! > Axil and I have been dancing around this idea also in a recent thread > (http://www.mail-archive.com/vortex-l%40eskimo.com/msg45022.html) > > I have a strong feeling that there are some electro-magnetic effects > playing an important role here . > > and I also found this tidbit on wikipedia: > > Nickel is a naturally magnetostrictive material, meaning that in the > > presence of a magnetic field, the material undergoes a small change in > > length.[41] In the case of nickel, this change in length is negative > > (contraction of the material), which is known as negative > > magnetostriction and is on the order of 50 ppm > > > On Mon, Apr 18, 2011 at 19:31, Mark Iverson <zeropo...@charter.net> wrote: > > Could the magnetic field generated by the resistive heaters be inducing > some > > other effects that help promote the reaction, or inductively heat the > > Nickel??? > > > > -Mark > > > > > > >
