Additionally, I think we may be able to examine the issue more experimentally by using similar materials.
For example, here is a spiral grooved alumina tube. http://dengfengjinyu.en.made-in-china.com/product/KqaEYeWMfSVC/China-Alumina-Tube-Spiral-Groove-.html On Mon, Oct 13, 2014 at 6:12 AM, Jack Cole <jcol...@gmail.com> wrote: > The trouble is, we don't know when that picture was taken and to what > extent the camera affected the color. > > I suspect one of the engineers here could take the temperature data from > the caps vs. the core area and compare the dummy vs. the active run. Since > the caps are not incandescent, perhaps this would be useful to examine. > > Just looking at Delta T/Watt of the caps doesn't seem to be consistent > with what I would expect with the core being 1400C. At the same time, > there is a suggestion of excess heating to me in the shift from 800 to 900W > (just considering the caps). I think someone good at thermodynamics in > solids could figure this out. > > On Sun, Oct 12, 2014 at 11:45 PM, H Veeder <hveeder...@gmail.com> wrote: > >> >> >> On Sun, Oct 12, 2014 at 11:43 PM, David Roberson <dlrober...@aol.com> >> wrote: >> >>> I refer to the opposite effect in this case Harry. In other words, can >>> the color appear to be too dark in the visual region to our eyes compared >>> to the emission of thermal energy in the IR. >>> >>> Are there surfaces that are very poor emitters of energy in the visual >>> region that behave more like a black body in the infrared region? This is >>> more of a question instead of a statement since it seems like that might be >>> happening in this special case. The light emitted does not have a color >>> that matches what is expected to be seen from a surface of a broad band >>> black body. I wonder if anyone on the list has seen materials with that >>> characteristic. >>> >>> If you consider the behavior of a RF radio transmitter, you will >>> understand the jest of my question. In that case, the amount of power at >>> its transmission frequency, being narrow band and so low in Hertz, would >>> indicate a black body that was at an enormous temperature if the complete >>> spectrum were available as expected. But we know that it does not >>> represent a true black body since it is narrow band. Can anything of a >>> similar nature exist at other frequency ranges such as IR? >>> >>> >> The blackbody would still have a low temperature if the distribution >> peeked at radio wave lengths which are much longer than light waves. See >> how the temperature peek of a blackbody declines as wavelength increases: >> http://voyager.egglescliffe.org.uk/physics/astronomy/blackbody/Image21b.gif >> >> You are struggling to find an explanation which is consistent with the >> claim of excess energy and with the 2nd law of thermodynamics (heat flows >> from a hotter region to a cooler region). Can it be done? You can >> disregard what I am about to say since I am not expert in these matters but >> I think a choice has to be made. Either there is no excess energy or the >> 2nd law has broken down in this system. >> >> Harry >> > >
