Deep bed drier simulation with intra-particle moisture diffusion

SIMULATION of CANOLA and BARLEY DRYING IN A DEEP BED

“…(1) equilibrium moisture content (EMC) equations have a good agreement with experimental data up to 0.8 RH, beyond this point the equations usually underpredict the EMC (Cenkowski et af. 1989) and (2) some authors (Boyce 1965;Ingram 1976) confirmed that there is a tendency for computed moisture content in the upper layer of the bed to be less than observed. It might be also attributable to errors in determining the constants in the thin layer equations which have a cumulative effect.…”

“…Mathematical modelling and computer simulation of drying of agricultural products are now widely used in research to predict and compare performance of different drying systems and match them with the crop quality after drying. Many different models have been proposed to describe the drying process in the basic types of convective grain dryers (O'Callaghan et al 1971; Bakker-Arkema et al 1974;Ingram 1976;Bruce 1984; Cenkowski and Sokhansanj 1988). The accuracy of predictions from these models is highly dependent on the completeness of the mathematical description of the drying phenomena and empirical relationships used to describe drying and rewetting characteristics of grain.…”

“…The primary objective of the paper was to adapt the crossflow model of Cenkowski and Sokhansanj (1988) to a deep bed drying process and to verify the mathematical model against experimental data obtained by Cenkowski during drying of canola. The second objective was to verify the adapted model against the experimental data of Boyce for drying barley in a fixed bed (experimental data of Boyce were taken from Ingram 1976 andO'Callaghan 1971). The third objective was to compare the predicted results of our adapted crossflow model against those from the Ingram (1976) model.…”

“…The second objective was to verify the adapted model against the experimental data of Boyce for drying barley in a fixed bed (experimental data of Boyce were taken from Ingram 1976 andO'Callaghan 1971). The third objective was to compare the predicted results of our adapted crossflow model against those from the Ingram (1976) model. Finally, the last objective was to compare the drying processes of canola and barley in deep beds by using the simulation model and to investigate the effects of grain parameters and drying conditions on canola drying.…”

Conjugate Heat and Mass Transfer in Convective Drying of Multiparticle Systems. Part I: Theoretical Considerations

“…Numerical techniques, such as the finite difference, finite element and finite volume methods, have been successfully used to simulate the heat and mass transfer that occur during the drying of grain (Spencer, 1969;Brooker et al 1974;Ingram, 1976;Misra and Young, 1978;Sokhansanj and Gustafson;Martins, 1982;Haghighi and Segerlind, 1988;Haghighi et al, 1990;l~dayaraj et al, 1992;Sarker et al, 1994;Douglas, 1994;Franca et al, 1994). However, most of these efforts have been restricted to analyses of single-kernel and deep-bedthin-layer drying for which simplifying assumptions are made.…”