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Physical Chemistry 3: — Chemical Kinetics — - Christian-Albrechts ...

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5.3 Transport processes in gases 114<br />

5.3.4 Viscosity<br />

I<br />

Figure 5.11: Newton’s law describes the inner friction in laminar flow.<br />

• Newton’s law:<br />

• Ansatz:<br />

µ <br />

<br />

= − <br />

<br />

(5.124)<br />

Γ = = momentum per molecule in direction (5.125)<br />

y<br />

• Result:<br />

−→ = − 1 µ <br />

2 ( )<br />

<br />

= 1 ( )<br />

= 1 <br />

= <br />

= 1 (5.126)<br />

2<br />

with = number density and = mass of molecule.

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