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Journal of Microwave Power
and Electromagnetic Energy (JMPEE) |
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TITLE |
Density Dependence
of the Dielectric Properties of Wheat and Whole-Wheat Flow [PDF] |
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AUTHORS |
S.O. Nelson 1984 19 1 55-64 |
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Abstract The dielectric properties
of hard red winter wheat and of whole-wheat flour milled from the same wheat were
measured at 11.67 GHz over a wide range of bulk densities and over a range of
moisture contents from 8.5 to 14.7%, wet basis. The square root and cube root
of the dielectric constant and also a function of the dielectric loss factor
were found to be linear functions of the density of the air-particle
mixtures. The slopes of the straight lines representing these relationships
increased nearly linearly with moisture content. Dielectric properties of the
wheat kernel were calculated from the linear relationships and presented as
functions of moisture content. An equation is provided for calculating the
dielectric constant of pulverized or granular materials at any density if the
dielectric constant is known at any given density. |
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