March 2003
Intermediate to advanced
1056 pages
32h 58m
English
book
Transport Processes and Separation Process Principles (Includes Unit Operations) Fourth Edition
by Christie John Geankoplis
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6.5. MOLECULAR DIFFUSION IN SOLIDS
6.5A. Introduction and Types of Diffusion in Solids
Even though rates of diffusion of gases, liquids, and solids in solids are generally slower than rates in liquids and gases, mass transfer in solids is quite important in chemical and biological processing. Some examples are leaching of foods, such as soybeans, and of metal ores; drying of timber, salts, and foods; diffusion and catalytic reaction in solid catalysts; separation of fluids by membranes; diffusion of gases through polymer films used in packaging; and treating of metals at high temperatures by gases.
We can broadly classify transport in solids into two types of diffusion: diffusion that can be considered to follow Fick's law and does not depend ...
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