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Dimensional analysis / similarity analysis help 
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#1
Dec2410, 12:28 AM

P: 2

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 110 scale model and smoke pellets being used?? Any help or opinions are greatly appreciated Thanks 


#2
Dec2410, 03:28 AM

P: 51

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}∇^{2}C_{A} Where v.∇C_{A} is your convective mass transfer term and, as you can see, is entirely dependent on velocity. 


#3
Dec3010, 08:34 PM

P: 2

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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