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Density of a multi-component mixture

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Old   April 23, 2012, 17:23
Default Density of a multi-component mixture
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Aditya
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Hi,

I have a mixture of 55% xenon, 35% hydrogen and 15%oxygen by mass fraction in a bubble surrounded by nitrogen medium.

By calculating the density using ideal gas the denisty of bubble should be greater than the density of nitrogen but the bubble turns out to be less denser than the surrounding nitrogen medium.

I have a UDF for specifying mass fractions and when I have only Xe and oxygen the bubble is denser than nitrogen but the moment hydrogen is added (even as little as 0.01 mass fraction), the bubble goes way below the density of surrounding nitrogen.

SETUP: DRIVEN SECTION OF TEH SHOC TUBE WITH NITROGEN AS THE SHOCK TUBE AND A BUBBLE AT THE CENTER.

someone please help.
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