Fluids

Fluids

Volumetric thermal expansion (Beta)

    • naada
      Subscriber
      II would like to ask how can I get the volumetric thermal expansion for compressible ideal gas?. The density will be varying due to temperature and pressure can I consider it as (1/T)?
    • Rob
      Ansys Employee

      Ideal gas uses the ideal gas law: not sure why you need an expansion coefficient? 

    • naada
      Subscriber
      I’m working in natural convection I need it to get the Rayleigh number:
    • Rob
      Ansys Employee

      Probably not unreasonable   https://en.wikipedia.org/wiki/Rayleigh_number    Not sure I've ever calculated Ra for a domain. 

    • DrAmine
      Ansys Employee

      Yes the expansion coefficient for ideal gas is 1/T if you assume isobaric condition which is not always true. I guess for the whole domain you need to get an average value of T so that you get an average of the thermal expansion coefficient

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