LDM Member

  • Member since Apr 29th 2017
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  • LDM

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    (Quote from Alan Smith)

    Thanks Alan,

    The link is for longitudinal fins, not for anular fins.
    Also the shape of the fins in the link is rectangular, not triangular as in the Lugano case.
    So I don't think we can apply the numbers of the calculator to the…
  • LDM

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    (Quote from Paradigmnoia)


    That reason for a lower convection rate was also mentioned in literature as the reason for the total convective heat transfer dropping off below the optimum fin spacing.
    If I remember well, you mentioned this before and you…
  • LDM

    Like (Post)
    (Quote from LDM)

    Thanks for your hard work. I am currently in an area of very poor internet, and soon to be where there is none, so I will be brief.

    I was mainly interested in building the IR emissivity tester to a reasonable level of ease of testing.…
  • LDM

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    (Quote from Paradigmnoia)


    Did you ever publish your measurements results of your replica ?
    What where your conclusions ?
  • LDM

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    Convection of the Lugano ECAT rib area

    I updated the convective heat transfer coefficients on my Excel sheet for the Lugano dummy run recalculation
    The Error is somewhat lower now, about 9.1 %
    With that error I expect that if we consider that the…
  • LDM

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    Convective heat transfer correction

    As stated in my previuos post I saw a large difference between the convective heat transfer coeeficient presented on page 16 of the Lugano report for zone 5 of the rib area on page 16 and the one I calculated for…
  • LDM

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    (Quote from Paradigmnoia)


    As I already stated when I presented the results, this is indeed something I planned on doing.
    However such a recalculation does not make sense if we don't have a good explanation for the large increase in convective energy of…
  • LDM

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    Lugano dummy run recalculation compare

    This post gives in a table the difference between the published Lugano dummy run data and the recalculation I did.
    (I had planned to make this comparison sooner, but fell and now have a concussion.)
    The difference…
  • LDM

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    Dummy run recalculation correction

    I have to admit that there was an error in the spreadsheet I published.
    The power of the rods was not multiplied by 2, since we have two sets of rods.
    The new calculation now shows an error of 12 % (see adapted…
  • LDM

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    In addition to the above calculation I can say that some preliminary FEM simulations of the dogbone i did in the past showed that the calculated temperatures where already in close agreement with those reported in the Lugano report.
    If the temperatures…
  • LDM

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    Lugano dummy run recalculated




    The dummy run recalculation of the Lugano report presented here is based on the assumption that correct emssivities settings where used for the Optris temperature measurements and thus that the reported temperatures for…
  • LDM

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    (Quote from Cydonia)


    I am totally an amateur in the LENR mechanisms.
    However if Palladium was added, it should, having mass number 106 shown up in the fuel analyzis of the Lugano ash. And I do not see a clear signal above the noise.
    My guess would be…
  • LDM

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    (Quote from Cydonia)


    I have to admit that I have currently no idea what the maximum temperature inside the Lugano reactor would have been.
    It depends on the temperatures and we don't know if the reported ones are correct.
    An option is to use the data…
  • LDM

    Post

    Lugano stacked tubes correction factor

    I was finally able to extract the convective heat flux values from my CFD simulation software.
    Both the convective heat flux values of the simulation of a single tube and the stacked tubes where calulated. This…
  • LDM

    Like (Post)
    Mais seulement quand nous ne les colonisons pas.
  • LDM

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    Humor about the English now !

    Comment avez-vous trouvé l’Anglais?
    Très distrayant. Ils ont une forme de conversation appelée “humour”, qui fait rire tout le monde.
  • LDM

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    I agree with Alan

    We had one customer which produced epitaxial high voltage transistors used in the line output stage of TV's.
    That epitaxial process was running at just over 1300 degree C
    While our Kantal heating elements had much larger diameters the…
  • LDM

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    Stacked tubes convective heat flux distribution

    The CFD simulation picture below shows for three stacked tubes of 3cm diameter and equilateral spaced with 1 mm distance at a temperature of 400K how the convective heat flux is distributed at the…
  • LDM

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    Some progress with the CFD simulation of convection of a single and three stacked tubes.
    However still trying to find out how to extract the amount of convected heat.




  • LDM

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    Paradigmnoia

    I have the definition for the derivation of n as used in the Optris equation somewhere. It also explains why n is 21 for the shortwave end of the IR spectrum, as in the image that Whyttenbach posted a long time ago. The number is not a