抄録
The authors derivated tae differential equation for predicting temperature of drying material from mass and heat transfer balance, and changed it to non-dimensional differential equation. Series solutions were obtained by the method of Frobenius. Both observed and theoretical values were compared, the former was nearly equal to the latter. Conseqently the propriety of theortical solutions were found.
The results obtained were as follows:
1) The material temperature during drying was exactly in accordance with drying air temperature at second critical moisture content Mf2.
2) Theoretical non-dimensional temperature equations were as follows;
a. In the period of falling drying rate,
Tma=∑∞n=1(-1)n-1(n-1)!A/II∞γ=1(A+γD)Qn
b. In the period of falling drying reat,
Tmac=∑∞n=1(-1)n-1(n-1)!A/II∞γ=1(A+γD)
3) Authors' theoretical solutions were comparedd with numerical solution by means of Runge-Kutta method, for instance it had relative errors from +0.6 to 4.5, from +0.1 to 4.2% for rough rice and onion, respectively. Then it was found that their theoretical solutions were useful for predicting temperature of drying material.
