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How calculate a Reynold's car

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Old   May 23, 2011, 10:19
Default How calculate a Reynold's car
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Hallo, I have drarw a 2D section car! Its lenght is 4.5 [m] and its hight si 1.5 [m]. In the reynold equation Re=(rho x v x L) / Viscosity what is it L?

Is it a lenght of 4.5 [m] or hight of 1.5 [m]?

Thankyou....I need this for an exam
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