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Steam v. Humidity Gas ?

Question asked by Jerry Pham on Jul 8, 2013
Latest reply on Jul 15, 2013 by Jerry Pham

Hi,

 

I am comparing Real Gas, Steam, Humidity in flow simulation. According to Solving Engineering Problems document:

“Real Gas” is quite distinct from the other types: using Redlich-Kwong state equation, best for “nearly-condensation temperatures and/or at nearly-critical and supercritical pressures, i.e. at conditions where the behavior of the gas can no longer be represented adequately by the ideal-gas state equation.”

 

 

Steam

Humidity

Condition

283 < T < 610 K, P < 107 Pa.

283 < T < 610 K, P < 107 Pa.

Condensed water

volume fraction of condensed water < 5%

volume fraction of condensed water < 5%

Condensation

Volume only

Volume only

Mixture

With other gas

With other gas

 

I don’t find any essential difference between the two except that “steam” can describe the behavior of pure water. But rarely in any situations do we have “pure water” that is not accompanied by air. So what is actually the difference between “steam” and gas with humidity turned on?

 

 

   

Jerry

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