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Anonymous Poster #1

Expansion Ratio

11/02/2012 1:39 AM

Can anyone share with me the formula to find out the Liquid-Gas Expansion Ratio for cryogenic liquids? For e-g, If I want to know how much gaseous chlorine will be produced on expanding one kg or litre of liquified chlorine?
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Tornado
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#1

Re: Expansion Ratio

11/02/2012 11:00 PM

I don't think this is done by formula(s); instead, it is by looking up material properties in tables or charts.

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redfred
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#2

Re: Expansion Ratio

11/03/2012 9:25 AM

The ideal gas law just might be useful here. The hard part for the OP might be if they can calculate how many moles or molecules of cryogenic material they have to start with. Fortunately most cryogenic fluids will be very pure fluids so only one molecular species must be considered. Calculating the density of the liquid can be done but this gets very complicated. One must consider the van der Waals forces along with the nominal atomic volume of the outer orbital to calculate the anticipated liquid volume at cryogenic temperatures. Calculation of the liquid density can be done but if the ideal gas law is a new idea....

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Joshi
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#3

Re: Expansion Ratio

11/03/2012 3:04 PM

Read the following:

Expansion ratio - Wikipedia, the free encyclopedia

Cryogenic Liquids
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