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Unformatted text preview: be slow in relation to the time needed for the system to come to equilibrium internally. For a gas 0-4 at conditions of interest to us, a given molecule can undergo roughly 10 10 molecular collisions per second, so that, if ten collisions are needed to come to equilibrium, the equilibration time is on the order of 10-9 seconds. This is generally much shorter than the time scales associated with the bulk properties of the flow (say the time needed for a fluid particle to move some significant fraction of the lighten of the device of interest). Over a large range of parameters, therefore, it is a very good approximation to view the thermodynamic processes as consisting of such a succession of equilibrium states....
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- Fall '10