comply with the concomitant decrease in volume, this means that it will
become dehydrated.
The diffusional resistance of a thin sheet of material is primarily
governed by the solubility of the diffusing species in the material of the sheet
and on its thickness. Very thin sheets, like adsorption layers, tend to cause
negligible resistence to most solutes.
BIBLIOGRAPHY
The classical engineering text and reference book on transport phenomena is the
thorough treatment by
R. B. Bird, W. E. Stewart, E. N. Lightfoot. Transport Phenomena, 2nded. John
Wiley, New York, 2002.
A comprehensive handbook giving both theory and tabulated data is
D. W. Green, J. O. Mahoney, R. H. Perry, eds. Perry’s Chemical Engineer’s
Handbook, 7thed. McGraw-Hill, New York, 1997.
or any older edition.
Especially treating foods is
D. R. Heldman, D. B. Lund. Handbook of Food Engineering. Marcel Dekker, New
York, 1992.
Chapter 5 by R. P. Singh treats heat transfer, and Chapter 7 by B. Hallstro ̈m, mass
transfer.
Several books on food rheology exist. A clear discussion of the principles of
rheology and of methods of measurement, with an emphasis on liquidlike systems, is
H. A. Barnes, J. F. Hutton, K. Walters. An Introduction to Rheology. Elsevier,
Amsterdam, 1989.
Most texts on physical chemistry discuss diffusion. A comprehensive description of
diffusion and related phenomena is also given in
K. J. Mysels. Introduction to Colloid Science. Interscience, New York, 1964.
Solutions of the diffusion equations for a wide variety of boundary conditions are
given in
J. Crank. The Mathematics of Diffusion, 2nded. Clarendon, Oxford, 1990.
The Darcy equation, its application and related phenomena are thoroughly discussed
in