3 Replies Latest reply on Jul 15, 2013 2:09 PM by Jerry Pham

    Steam v. Humidity Gas ?

    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