February 2015
Intermediate to advanced
578 pages
19h 27m
English
Content preview from Advanced Thermodynamics for Engineers, 2nd Edition
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20.7 DIFFUSION AND HEAT TRANSFER
20.7.1 BASIC PHENOMENA INVOLVED
The classical law of diffusion is due to Fick (1856). This states that the diffusion rate is proportional to
the concentration gradient, and is the mass transfer analogy of the thermal conduction law. The constant
of proportionality in Fick’s law is called the diffusion coefficient. It was found from experimental
evidence that the diffusion coefficient tended to vary with conditions and that better proportionality
could be obtained if the rate of diffusion was related to the gradient of chemical potential; this law is due
to Hartley. Figure 20.7 shows an adiabatic system made up of two ...
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