Dw. Sun et Jl. Woods, THE MOISTURE-CONTENT RELATIVE-HUMIDITY EQUILIBRIUM RELATIONSHIP OF WHEAT - A REVIEW, Drying technology, 11(7), 1993, pp. 1523-1551
Thirty three sources of hygroscopic data for wheat are identified. Gra
vimetric methods predominate in the literature, followed by hygrometri
c methods which largely employ a dew point technique for relative humi
dity determination. Hysteresis effects vary considerably in magnitude.
The greatest difference between adsorption and desorption isotherms o
ccurs in the 20 - 40% RH region. A table of equilibrium moisture conte
nts interpolated from the data sets is presented for a fixed set of te
mperatures and RH to enable comparison. The isotherm equations used to
fit the data are also reviewed. The Strohman-Yoerger, Modified-Oswin,
Modified-Chung-Pfost, Chen-Clayton and Modified-Henderson equations a
re identified as the most suitable. Further investigation is needed to
compare them.