dimensional analysis / similarity analysis help

victor_123

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

Thanks

mrmiller1

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...
∂C_A/∂t + v.∇C_A = D_AB∇²C_A

Where v.∇C_A is your convective mass transfer term and, as you can see, is entirely dependent on velocity.

victor_123

Thanks, that’s what I thought too. But I’m unsure of what parameters to use in the analysis. Any ideas people?

Thanks again