When to use mass-weighted average quantity

- November 13, 2020 at 8:40 pm
  
  roytorc
  Subscriber
  
  Could anyone let me know when to use a mass-weighted average. I'm calculating average value of scalar dissipation rate. Is it suitable?n
- November 16, 2020 at 1:46 pm
  
  Rob
  Forum Moderator
  
  We use mass and area weighted depending on what's needed. nFor an outlet temperature (flow boundary) I'd use mass weighted. On a wall surface for temperature I'd use area weighted. n
- February 12, 2021 at 2:06 pm
  
  Abubakar
  Subscriber
  
  Hi Rob, nCan't we use in a reverse way? nThank you,nAbu Bakar kha
- February 15, 2021 at 9:45 am
  
  Rob
  Forum Moderator
  
  Please explain, I'm not sure what you mean. n
- February 15, 2021 at 11:33 am
  
  Abubakar
  Subscriber
  
  I mean to say that is it ok if I am using an area-weighted average for flow boundary and the mass-weighted average for wall surfacen
- February 15, 2021 at 3:46 pm
  
  Rob
  Forum Moderator
  
  You can use those. However, how will area average account for a small region that's going very quickly when checking the mean temperature or species passing though a plane? n

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