What is the formula for calculating convective time using the Reynolds number?

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AIR&SPACE
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How does one determine (also read as "what is") the convective time of a flow given its Reynolds number? I've not been able to find a proper description via Google and am thinking it may be too "application specific." Regardless, if anyone has knowledge of this I would greatly appreciate your insight!
 
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It is application specific, but it is often the characteristic length of your system (used for Re) divided by the mean flow.
 

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