Formule hydraulique Flashcards

1
Q

caracteristique d’une force

A

sa direction
son sens
son point d’application
intensité

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2
Q

force

A

P=F/S
P en pascal
F force pressante en N
S surface en m2

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3
Q

1 pascal egale a?

A

1 newton par M2

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4
Q

prelative=

A

prelative= pabsolue-pmilieu

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5
Q

pression generé par une colonne d’eau + pression dans l’eau

A
P= p*g*h 
P= p*g*h+ 1 bar
p masse volumique en kg/m2
g constante gravitationnelle 9,81N
h hauteur en m
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6
Q

pression sur un point au fond de l’eau

A

P=1 bar =H/10
p pression en pascal
h hauteur en m

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7
Q

masse volumique

A

p=m/v
p masse volumique en kgm3
m masse en kg
v volume en m3

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8
Q

volume ne m3

A

v=s*h
v volume en m3
s surface en en m2
h: hauteur en m

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9
Q

théoreme de pascal

A

PF=F/S=f/s=Pf

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10
Q

debit + vitesse +debit en M3

A

Q=v/t => Q m3 v en m/s t en seconde
; v=SL v en m/s s en m2 v en m/s
; Q=s
v Q en m3/s s en m2 v vitesse en m/s

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11
Q

Q1=Q2 donc

A

V2S2=V1S1

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12
Q

perte de charge hectometrique

A

J=Jhec*L/100
j perte de charge
jhec perte hecto en bar/hm
L en distance en metre

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13
Q

perte de charge en bar

A

J2Q1=J1Q2
j perte de charge en bar (valable aussi pour j h en bar/hm)
Q debit en m3/s

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14
Q

perte de charge liees au denivele

A

jden=h/10

h en metre

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15
Q

reaction a la lance

A

R=2sprecul
R reaction à la lance en Newton
s surface en m2
Precul: Pabs- Prel=>(6-1)*10^5

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16
Q

concentration

A

vemulseur/v pre melange*100
c concentration sans unite
v volume en L ou m3

17
Q

foisonnement

A

F=vmousse/vpremelange
f foisonnement sans unite
v volume en L ou m3