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Dimensional analysis / similarity analysis help

  1. Dec 24, 2010 #1
    I’m currently investigation the fluid motion (diffusion) of gas's so see how well they can ventilate in an enclosure.

    I would like to simulate this using a (1/10) scale model. The enclosure has already been built, and smoke pellets are going to be placed inside to help visualize fluid motion.

    If I add a fan to simulate wind, will there have to be any scaling on its velocity to account for the 1-10 scale model and smoke pellets being used??

    Any help or opinions are greatly appreciated

  2. jcsd
  3. Dec 24, 2010 #2
    I think so. If you have a model race track then a car traveling normal speeds on your scaled down track would be way too fast, right?

    The mass transfer differential equation...
    ∂CA/∂t + v.∇CA = DAB2CA

    Where v.∇CA is your convective mass transfer term and, as you can see, is entirely dependent on velocity.
  4. Dec 30, 2010 #3
    Thanks, that’s what I thought too. But I’m unsure of what parameters to use in the analysis. Any ideas people?

    Thanks again
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