Fiche Ms 3 Flashcards

1
Q

Densité surfacique de pores

A

n=N/S

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2
Q

Densité de flux à travers un pore

A

jpore=-DdC/dx=D∆C/d

= v. C2-C1.e(vd/D)/1-e(vd/D)
En régime permanent

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3
Q

[Jv pore]

A

= L3T-1

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4
Q

Densité de flux à travers une membrane

A

j=J/Smbr =Jpore.n/Smbr=Jpore.n

=Pd∆C

=nπa⁴/8ηd . C2-C1.e(a²∆p/8ηD)/1-e(a²∆p/8ηD) . ∆p

Dernier en régime permanent

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5
Q

Perméabilité diffusionnelle

A

Pd=nDπa²/d

[Pd]=L.T-1

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6
Q

Perméabilité hydraulique

A

Lp=nπa⁴/8ηd

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7
Q

[Lp]

A

L2TM-1

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8
Q

Densité de flux volumique

A

jv=Lp∆p

=Lp(∆p-∆π)

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9
Q

Flux d’entraînement de soluté (pore) (mbr)

A

jpore(x)=C(x).v

Mbr: j(x)=C(x).jv

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10
Q

Loi de Van’t Hoff: pression osmotique

A

π=cRT=CKbT

En Pa
c en osmole.m-3

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11
Q

Loi des gaz parfaits

A

pV=nRT

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12
Q

Pression efficace

A

pe=p-π

p pression hydrostatique

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13
Q

Densité de flux volumique à travers une mbr semi-perméable (σ=1)

Densité de flux de soluté

A

jv=Lp(∆p-KbT∆C)

J=0

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14
Q

Densité de flux volumique à travers une membrane séléctive

(0

A

jv=Lp.∆pe
=Lp(∆p-∆pi)
=Lp(∆p-σKbT∆C)

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15
Q

Densité de flux de soluté à travers une mbr sélective

A

J=(1-σ).(Pd.∆C+jv)

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