gases at non-atmospheric pressure

From: Burge, F \(Frances\) (frances.burge@diamond.ac.uk)
Date: Thu Jan 26 2006 - 16:35:04 CET

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    Hello Fluka users,

      I'm trying to define a mixture of H2 and CO gas at 0.1 atmospheres
    pressure. Is the following approach correct?

      First I define CO, using the MATERIAL card to give its density at 0.1
    atm, followed by the COMPOUND card giving atom relative contents of C
    and O in the compound.
      I then use another MATERIAL card to define the density of the H2/CO
    mixture again at 0.1 atm, followed by the COMPOUND card giving the mass
    fractions of H2 and CO in the mixture.
    (Since H, C and O are in the list of pre-defined materials I have not
    changed their definitions, including density).

    Now according to the notes about MAT-PROP card in the manual, gas
    pressure is set to 1 atmosphere if the density is <0.01 (true in this
    case). Since I have defined the densities already at 0.1 atm, do I also
    need to include a MAT-PROP card with WHAT(1) = 0.1 to do the calculation
    correctly at 0.1atm? Or should I have left the densities in the MATERIAL
    cards as the atmospheric pressure values, and then used a MAT-PROP card
    to correct them?

    All advice gratefully received,

    Frances

    Frances Burge
    Health Physicist
    01235 778269
    Diamond Light Source Ltd.
    Rutherford Appleton Laboratory
    Chilton
    Didcot
    OX11 0QX
     

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