Jangam, Mujumdar - Classification and Selection
3. 8. CLOSING REMARKS
It is difficult to generate definitive general rules for both classification and selection
of dryers because exceptions occur rather frequently. Often, minor changes in feed or
product characteristics result in different dryer types being the appropriate choices. It is
not uncommon to find different dryer types being used to dry apparently the same ma-
terial. The choice is dependent on production throughput, flexibility requirements, cost
of fuel as well as on the subjective judgment of the individual who specified the equip-
ment.
We have also discussed some novel dryers in this chapter. However, Kudra and Mu-
jumdar (2000) have discussed in detail most of the non-conventional and novel drying
technologies reported in the literature. Most of them have yet to mature; a few have
been commercialized successfully for certain products. It is useful to be aware of such
advances so that the user can make intelligent decisions about dryer selection. Since
dryer life is typically 25-40 years that effect of a poor “prescription” can have a long-
term impact on the economic health of the plant. It is typically not a desirable option to
depend exclusively on prior experience, reports in the literature or vendors’ recommen-
dations. Each drying problem deserves its own independent evaluation and solution.
Finally some ideas are presented for selection of dryer for drying of selected food prod-
ucts. However, these are just suggestions and this should be experimentally tested.
REFERENCES
Baker, C.G.J., 1997, Dryer Selection, pp. 242-271, in C.G.J. Baker (Ed.) Industrial Drying of
Foods, Blackie Academic & Professional, London.
Kudra, T., Mujumdar, A.S., 2000, Advanced Drying Technologies, Marcel Dekker, New York.
Kudra, T., Mujumdar, A.S., 1995, Special Drying Techniques and Novel Dryers, pp. 1087-
1149, in A.S. Mujumdar (Ed.) Handbook of Industrial Drying, 2nd Edition, Marcel Dekker,
New York.
Kudra, T., Mujumdar, A.S. 2009, Advanced Drying Technologies, CRC Press, Taylor and Fran-
cis.
Masters, K., 1985, Spray Drying Handbook, Halsted Press, New York.
Mujumdar, A.S. (Ed.), 1995, Handbook of Industrial Drying, 2nd Edition, Marcel Dekker,
New York.
Mujumdar, A.S., 2006, Handbook of Industrial Drying, 3rd Ed; CRC Press: Boca Raton, FL.
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