Fluides visqueux Flashcards

1
Q

Ecoulement visqueux

A

P et T diminue à cause des pertes de charges

p2 < p1 p2 = p1 - ΔPpois

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2
Q

Perte de poiseuille

A

ΔPpois = RQ

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3
Q

Résistance hydraulique

A

R = 8ηL / πa^4 (en Pa.s.m^-3)

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4
Q

Puissance dissipée

A

P = ΔPpoisQ = RQ^2

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5
Q

En série

A

Q1=Q2
ΔPtot = ΔP1 - ΔP2
Rtot = R1 + R2

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6
Q

En parallèle

A
Qtot = Q1 + Q2
ΔPtot = ΔP1 = ΔP2
1/Rtot = 1/R1 + 1/R2
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7
Q

Bernouilli

A

p1 + ρgz1 + 1/2ρv^2 + ΔPpompe = p2 + ρgz2 + 1/2ρv^2 + ΔPpois

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8
Q

Surface

A

S = (4)πr^2

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