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Mécanique des fluides


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Posted

Heyyyy ! Ce serait pour savoir si qlqn pourrait m'expliquer ce que la formule veut dire et d'où sortent les valeurs ? (Car dans l'énoncé on nous donne seulement ça :

 image.png.8c1e3ef44fbd9f00dbf9b39dcbf52ff0.png

Et du coup voilà je n'ai pas compris d'où sortent ces valeurs image.png.630910c54b71350157ab0c8a8609e5a6.png

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Posted

Tu as la formule suivante :

D = A1 x V1 = A2 x V2

où A1 est l'air en 1 donc  pi x r^2 (l'aire d'un cercle)

-> A1 = pi x (diamètre / 2 ) ^2 

-> A1 = pi x (2/2) ^2 = 3,14 x 1^2 = 3,14 cm^2 = 3,14 x 10^-2 m^2

D = A1 x V1 = 3,14 x 10 ^-2 x 2 = 6,28 x 10^-2 m^3. s^-1

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