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MECANIQUE DES FLUIDES. Cours et exercices corrigés - UVT e-doc

MECANIQUE DES FLUIDES. Cours et exercices corrigés - UVT e-doc

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Chapitre 4 : Dynamique des fluides incompressibles réels<br />

A.N.<br />

4.16<br />

V B '<br />

= = 0,0339 m / s<br />

π<br />

2<br />

.0,1 .60.1000<br />

4. F<br />

4.6151<br />

3) Pression sur le piston : P B '<br />

= π<br />

2<br />

A.N. P B '<br />

= = 783169, 64 Pa<br />

2<br />

. D<br />

π .0,1<br />

V<br />

2<br />

−V<br />

2<br />

B<br />

4) Equation de Bernoulli : ' B B'<br />

B<br />

+ + g( Z − Z ) = 0<br />

Or Z B’ =Z B<br />

1 2 2<br />

donc P = P + . ρ ( V −V<br />

)<br />

B<br />

B' .<br />

2<br />

B'<br />

B<br />

2<br />

P<br />

− P<br />

ρ<br />

1<br />

P B<br />

783169,64 900 0,0339 13,581 700170, 55<br />

2<br />

2<br />

2<br />

A.N. = + ( − ) = Pa<br />

Partie 2 :<br />

16<br />

1) Débit massique : q<br />

m<br />

= ρ.<br />

qV<br />

A.N. q m<br />

= 900 . = 0,24 kg / s<br />

1000.60<br />

2) Nombre de Reynolds :<br />

V.d<br />

13,581.0,005<br />

Re = A.N. Re = = 2716, 2<br />

− 6<br />

υ<br />

25.10<br />

3) 2000

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