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Characteristic lengh in Reynolds number

  1. Mar 29, 2017 #1
    As we know $$Re= \frac{ρ.v.l}{μ}$$ The characteristic length (l) is said to be representative of the problem but according to what should we choose this length? I mean if we want to calculate Reynolds number of a wing of plane, should we choose the length or the width?
  2. jcsd
  3. Mar 30, 2017 #2


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    Which do you think and why? In fact, there isn't really a correct answer here. You just have to choose based on the physics you hope to study. Really there are many possible versions of ##Re## even just on a wing depending on the phenomenon of interest.
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