Fluids

Fluids

In CFX and Fluent, is “mass flow” set under normal or operating conditions?

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    • offroader10052
      Subscriber
      Hello.nPlease tell menin CFX and Fluent mass flow (kg / s)non the input boundary conditions tabnis asked under normal or operating conditions?nFor a liquid, this is not usually important.nIt is very important for gas.n
    • Rob
      Ansys Employee
      Mass flow boundaries will add that amount of mass at the boundary conditions specified. So, you need to be careful with the pressure & temperature etc for compressible gases. n
    • offroader10052
      Subscriber
      Thanksn
    • offroader10052
      Subscriber
      I understood like this:nGiven:nVolumetric gas flow rate under standard conditions (temperature 25 ?C, pressure 1 atm).nTask 1:nDetermine the mass flow rate at a temperature of 50 ?C and a pressure of 10 atm in the apparatus.nTask 2:nEnter the obtained mass flow rate into the ansis.nSolution step by step:nStep 1.nRecalculate the volumetric flow rate (m3/s) in Excel under operating conditions (temperature 50 ?C, pressure 10 atm).nStep 2nRecalculate in Excel the mass flow rate (kg/s) according to the obtained volumetric flow rate under operating conditions in the previous step.nStep 3:nEnter the obtained mass flow rate into the ansis.nLet it be useful to someone.n
    • Rob
      Ansys Employee
      Also remember if the pressure doesn't change much in the domain that you can alter the material density etc and ignore the pressure. n
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