Fluids

Fluids

Operating Pressure issue

    • 164170007
      Subscriber

      Hello Everyone,
      I am planning to simulate flow of water vapor inside the reactor at p_actual(absolute)=1bar and p_actual=10bar, to see the effect of pressure.
      In ANSYS p_real=p_operating+p_gauge (correct me if I am wrong).

      I tried two different cases.
      CASE I = P_operating=10bar, p_outlet=0bar, mass flow inlet=0.5kg/s, T_inlet=673K and density =incompressible ideal gas,
      CASE II=P_operating=1bar, p_outlet=9bar, mass flow inlet=0.5kg/s, T_inlet=673K and density =incompressible ideal gas,

      My question is that why I am getting two different results because real pressure =10bar only.

      Is it because density is calculated based on the operating pressure, and if if its true then how do I know that which CASE (either I or II) will give me correct results?

      Thanks in advance.

    • Rob
      Ansys Employee

      Can you post the results and inlet panel? Read the definition for incompressible ideal gas, pressure shouldn't have any effect on density. 

    • 164170007
      Subscriber

      Hello Rob,

      Thanks for replying. Please see the inputs for both cases and let me know which one is correct because my p_in (absolute) which I am getting is different for both simulations.

    • Rob
      Ansys Employee

      Gauge pressure is the same (within a couple of Pascals) between the two cases : 137079.3 Pa v 137077.5 Pa

    • 164170007
      Subscriber

      Hello Rob, I agree that but my question is which P_inlet (absolute) I have to consider as a final result?

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