LDM Member

  • Member since Apr 29th 2017
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  • LDM

    Post
    (Quote from Paradigmnoia)


    I think that the electrical data is about right, otherwise I could not have compared the convective and radiated power with the electrical power.
    If I do a recalculation based on assumed inflated temperatures, then I convert…
  • LDM

    Post
    (Quote from Paradigmnoia)


    My feeling (For what it is worth) is otherwise, so let's wait for the recalculation and see who was right
  • LDM

    Post
    (Quote from Paradigmnoia)


    The simulation I did was on a model of the MFMP dogbone. (without rods)

    The remark that the simulated temperatures where near the Lugano ones must be interpreted as that they where much closer to the Lugano ones then those of…
  • LDM

    Post
    (Quote from Paradigmnoia)


    What's important is that if they where inflated, what then the real input power must have been.
    So the next thing for me to work on is making a spread sheet based on inflated temperatures and calculate what in that case the…
  • LDM

    Post
    (Quote from Paradigmnoia)


    I find it a pitty that the MFMP did not cross check their measurements by calculating the convective and radiated thermal power and compare it with their electrical power setting.
    If you do that you will see that the convective…
  • LDM

    Post
    Lugano dummy run recalculated - Final




    The close agreement between applied electrical power and the confected and radiated thermal power makes it unlikely that the reported temperatures where inflated






    Presented here is the, what I believe final,…
  • LDM

    Post
    (Quote from Paradigmnoia)



    For a bare tube the convective power can be calculated as :

    Q = h x At x (Ts - Ta)

    ---------h--------Convective heat transfer coefficient
    ---------Q--------The power
    ---------At-------The area of the tube

    ---------Ts-------
  • LDM

    Post
    Lugano ECAT convection correction

    Due to the close spacing of the ribs of the Lugano ECAT, the convective heat transfer of the ribs is less effective. Thus there needs to be applied a correction to the calculated convective heat transfer of the ribs.
  • LDM

    Post
    Simulating convection with CFD - update 2

    In my previous post I wrote :

    Next step now is to do some additional simulations to gain more insight on the effect of using higher levels of meshes (smaller mesh sizes) instead of using a boundery layer. This
  • LDM

    Post
    Simulating convection with CFD - update 1

    As a first approach to simulating natural convection for a ribbed tube I started with simulating convection of a bare tube.
    I used the bare tube case since calculating natural convection for a bare tube is a…
  • LDM

    Like (Post)
    (Quote from oldguy)

    Hedy Lamarr!
  • LDM

    Replied to the thread Rossi-Blog Comment Discussion.
    Post
    (Quote from oldguy)


    That would indeed be a possible counter measure
    However radar antenna's and/or related waveguides tend to be tuned to the radar frequency, so that limits the frequency span which you can use.
    Also current processor power likely (But…
  • LDM

    Replied to the thread Rossi-Blog Comment Discussion.
    Post
    (Quote from Zeus46)


    While I agree often with your technically insights, I think this time your comment are made too rash

    There are a lot western defense technology journals where you can find information on the SU57
    If you had read them you would know…
  • LDM

    Post
    Much more important then my simulations is that You and Russ continue to make progress.
    Hope to see that reported on the atom-ecology thread when I am away !
  • LDM

    Post
    Simulating convection with CFD

    Since my last post I have been spending time on how to simulate with my CFD software natural convection. There are two major parts which determine a correct outcome of a CFD simulation.
    These are :

    1. Quality of the…
  • LDM

    Replied to the thread ICCF21 Thread.
    Post
    (Quote from Alan Smith)


    Some "smart" people would now conclude that PARA and Alan have the same TC loggers.
  • LDM

    Replied to the thread ICCF21 Thread.
    Post
    (Quote from Alan Smith)


    Alan,

    May I disagree ?

    Some thermocouple circuits have a high ohmic pull-up resistor, which when the thermocouple gets broken, cause a high voltage at the input. (We used 10 MegaOhm resistors)
    This will result in a high…
  • LDM

    Like (Post)
    Thinking about the Dog Bone photo had me going back into my older test files... such hard work; burnt down nearly all of them...