|
From: Moore, S. <st...@sa...> - 2025-03-25 22:03:54
|
>Each species has a relative fractional density, such as 0.2, meaning one out of 5 particles is that species I think this is the definition of mole fraction, i.e. 1 particle/5 particles total = 0.2. 1 mole is just a large number of particles. It is not mass fraction. Stan ________________________________ From: Woode, Bryan [US] (DS) <Bry...@ng...> Sent: Tuesday, March 25, 2025 3:50 PM To: spa...@li... <spa...@li...> Subject: [EXTERNAL] [sparta-users] Mixture Command - Mass or Mole Fraction Hello SPARTA Users, For the mixture command, does the "frac" keyword specify the mass fraction or mole fraction? The manual says "The frac keyword sets a per-species attribute for individual species in the mixture. Each species has a relative fractional density, such as 0.2, meaning one out of 5 particles is that species", but there is no mention of whether this should be the mole fraction or not. Any insights? Respectfully, Bryan Woode | Modeling & Simulation Systems Engineer Northrop Grumman Corporation | Space Systems O: 385-442-0669 | Bry...@ng...<mailto:Bry...@ng...> |