CHEM 3615H CHAP 20

The velocity gradient is also called the shear rate

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Unformatted text preview: Transport Properties of a perfect gas. Starting from Phenomenological Equations and introducing the concept of flux, J, we find that: • the flux of matter (called particle or mass diffusion) is proportional to the first derivative of concentration with respect to position (concentration gradient) • the flux of heat (heat transfer or heat diffusion) is proportional to the first derivative of temperature with respect to position (temperature gradient) • the flux of momentum (stress, which is equal to force per unit area is the change in momentum (mv) per unit time and unit area) is proportional to the velocity gradient (∂vx/ ∂z) or first derivative of the x- component of the velocity with respect to the position along the z- axis (for a liquid flowing along the x- axis, contained between two surfaces at different positions alo...
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