In these triac light dimmers, the rise/fall times are very sharp maybe in the nanoseconds. That means that a lot of instantaneous power is being feed into the heater wire as the power pulse starts when the leading edge waveform is used.
On Tue, Mar 17, 2015 at 4:56 PM, Axil Axil <janap...@gmail.com> wrote: > According to Jack, the reaction did not happen in the fuel, but in the > insolating layer. The fuel composition does not matter. IMHP, what matters > is the exact nature of the heater current. > > On Tue, Mar 17, 2015 at 4:38 PM, Robert Ellefson <vortex-h...@e2ke.com> > wrote: > >> Jack, >> >> >> >> Fantastic! I’m really stoked to hear of your progress. I think your >> powder recipe sounds very interesting, and I would love to know more about >> the details of the reactants. It sounds like you’ve come up with a mixture >> which may contain one or more key ingredients not yet identified as being >> of primary significance to the high-gain modes of these systems. >> >> >> >> If I may fire away: >> >> What size Fe2O3 and TiH2 grains were present? >> >> Is this mixture generally not hygroscopic, and therefore is curing the >> reactor’s sealant a simple matter as compared to LAH? >> Are you tumbling or milling these reactants, or performing any other >> notable processing steps, prior to putting them into the reactors? >> >> >> >> Thanks for sharing, and keep up the great work! >> >> >> >> -Bob >> >> >> >> >> >> *From:* Jack Cole [mailto:jcol...@gmail.com] >> *Sent:* Tuesday, March 17, 2015 1:08 PM >> *To:* vortex-l@eskimo.com >> >> *Subject:* Re: [Vo]:melted alumina tube >> >> >> >> Bob, >> >> >> >> The input power was ~260W. I don't know what the R value of the >> insulation is. I had the cell surrounded by high purity alumina powder and >> covered with a thin sheet of ceramic insulation. I used standard 120V AC >> 60hz with a triac type dimmer switch (chops the waves starting at V=0). >> I'll have to check with the manufacturer to see what the remaining 5% of >> the tube is. The heating element was Kanthal A1. It's strange that the >> heating element was able to completely melt at points. In the past, it has >> always failed before melting. >> >> >> >> I was using INCO type 255 nickel, TiH2, LiOh, KOH, aluminum powder, and >> Fe2O3. Good idea on the small amount of fuel which should cause some >> localized melting. >> >> >> >> The fact that the fuel was a small diameter cylinder seems to suggest >> that it was fully expanded in the tube and shrunk down. >> >> >> >> Jack >> >> >> >> >> >> On Tue, Mar 17, 2015 at 2:02 PM, Bob Cook <frobertc...@hotmail.com> >> wrote: >> >> Jack-- >> >> >> >> It looks like you had a pretty good reaction. >> >> >> >> What was the input power? What is the R value of the insulation on the >> outside of the electric coils? What was the nature of the electrical >> input--frequency etc? And what is the electrical heating element >> material? If you have an acetylene torch, see if you can melt a piece of >> the tube that melted. >> >> >> >> The tube may have had glass fibers incorporated in order to improve >> strength. You indicated it was 95% pure. What was the other 5%? >> >> >> >> What was you fuel mixture? You may want to try a small fuel loading and >> see if the same intense reaction happens--all else the same. >> >> >> >> Try the test with a iron core instead of a fuel load and determine if >> there is an apparent magnetic field which would hold the iron core in >> position when direct current is applied to the heating coil. An >> alternating current would of course change the magnetic field and may >> make for null reaction conditions. >> >> >> >> Try 2 or 3 t/c's if you can--one inside and two outside to get a measure >> of the temperature gradient along the tube. Also another easy way to >> determine temperatures is the use of thermal sticks on accessible >> surfaces. Welders use these to determine preheating temperatures. They >> may provide a cheap temperature measure for you. >> >> >> >> Keep it shielded--good luck. >> >> >> >> Bob >> >> ----- Original Message ----- >> >> *From:* Jack Cole <jcol...@gmail.com> >> >> *To:* vortex-l@eskimo.com >> >> *Sent:* Tuesday, March 17, 2015 9:39 AM >> >> *Subject:* Re: [Vo]:melted alumina tube >> >> >> >> To add a couple of more details. The agglomerated piece of material is >> extremely hard. I tried to break it off with pliers, but it seemed like it >> would take more force than to break the entire cell. The resistance wire >> is extremely difficult to separate from the cell. I plan to open the cell >> with a diamond blade later today to see if more can be learned about what >> took place (e.g., evidence of melting on the inside of tube). I was able >> to get one piece of the resistance wire pried from the tube. There were >> indentations in the cell. >> >> >> >> As a follow-up experiment, I need to run it without the fuel to the same >> power levels to see if the same effects occur. >> >> >> >> On Tue, Mar 17, 2015 at 9:42 AM, Jack Cole <jcol...@gmail.com> wrote: >> >> I had an interesting experiment yesterday. This was my first time using >> a triac to regulate input power and sealing the tube with a compression >> fitting. Unfortunately, my thermocouple failed. >> >> >> >> Take a look at the alumina tube and the evidence for melting. The >> furnace sealant which I coated it with completely melted and agglomerated >> to the bottom of the cell (also appears to be mixed with melted alumina). >> >> >> >> >> http://www.lenr-coldfusion.com/wp-content/uploads/2015/03/IMG_20150317_084823_361.jpg >> >> >> >> The tube was purchased from China and is purportedly 95% pure. It was >> supposed to have a continuous operating temperature of 1500C. >> >> >> >> Any opinions? >> >> >> >> Jack >> >> >> >> >> >> >> >> >> > >
