If it actually got hot enough to ignite the thermite, that might melt the alumina. I was thinking Bob said some time ago that it takes temps somewhere above 2000C to ignite thermite. I haven't done the calculations for that yet.
On Tue, Mar 17, 2015 at 8:16 PM, <torulf.gr...@bredband.net> wrote: > Aluminium powder and Fe2O3 may give lots of heat in short time a termite > reaction. > > Have you any calculations about how much energy this reaction may release? > > > > > > On Tue, 17 Mar 2015 18:26:24 -0400, Axil Axil <janap...@gmail.com> wrote: > > Steady accumulation of energy followed by its rapid release can result > in the delivery of a larger amount of instantaneous power over a shorter > period of time (although the total energy is the same). Energy is typically > stored within a circuit of the device. What happens is based on the circuit > of the dimmer. > > By releasing the stored energy over a very short interval (a process that > is called energy compression), a huge amount of peak power can be delivered > to a load. For example, if one joule of energy is stored within a capacitor > and then evenly released to a load over one second, the peak power > delivered to the load would only be 1 watt. However, if all of the stored > energy were released within one microsecond, the peak power would be one > megawatt, a million times greater. > > If the current rise is fast enough, the wire does not have enough time to > heat up, but the magnetic flux during the rise might be huge. > > On Tue, Mar 17, 2015 at 6:09 PM, David L. Babcock <olb...@gmail.com> > wrote: > >> "Very sharp" -just means that the power is applied nearly >> instantaneously. Not any more power, just whatever equals E2 /R. >> However the temperature gradient would indeed be higher, so the wire would >> expand sooner than the matrix around. If the matrix temperature rises and >> falls a lot during a small part of a line cycle, stress might get pretty >> high. But isn't the wire a near-zero expansion/temperature material? >> >> Ol' Bab -who was an engineer... >> >> >> >> On 3/17/2015 4:02 PM, Axil Axil wrote: >> >> 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 >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>> >> >> >> ------------------------------ >> <http://www.avast.com/> >> >> This email has been checked for viruses by Avast antivirus software. >> www.avast.com >> >
