2. Definitions of transport properties
We say that each transport property is defined by a gradient law of proportionality between a flow and a gradient.
If the gas is subjected to a velocity gradient (du /dy ), this results in a flow of momentum which translates into a shear stressτ :
The dynamic viscosityη (in Pl or Pa · s) is the coefficient of proportionality between τ (in N · m – 2 ) and du /dy (in s – 1 ).
The thermal conductivityλ (W · m –1 · K –1 ) is the coefficient...
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Definitions of transport properties
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