Determination of Parameters for an Alfalfa Rotary Dryer
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All variables --wet alfalfa input capacity, dry alfalfa output capacity, alfalfa stem
length, rotary speed, heated air temperature, air flow velocity and flight amount were
integrated and derived into four ðterms based on the dimensional homogeneity theorem. An
improved similitude theorem was used to design an experiment program for the abovementioned
drying. A set of component equations involving the drying parameters was
derived from an improved Murphy’s theorem, and the most of its correlation coefficients are
higher than 0.99. The validation results show that most of the relative errors of Pi terms are
lower than 10% and are acceptable in engineering. The experimental results justified that
theorem of following advantages: fewer numbers of tests, less strict requirements on the
variable’s intervals, and higher precision of prediction these models may be used to study
parameter interaction effects on the conveyor performance, which may be useful in the
design and selection of rotary dryers for drying alfalfa hay.