A Method of Determination of the Diffusion Coefficient Based on Kernel Moisture Content and Its Temperature

Modelling and optimization of drying variables in thin layer drying of parboiled paddy

“…A peak effective moisture diffusivity for the parboiled paddy was obtained at the end of the drying process. At a drying air temperature of 150°C, when the average moisture content (M avg ) reached approximately 12%, D eff showed a maximum value as has been observed previously for other dried products (Jaros, Cenkowski, Jayas, & Pabis, 1992;Karathanos et al, 1990;Raghavan, Tulasidas, Sablani, & Ramaswamy, 1995). Thereafter, D eff started decreasing with decrease in the average moisture content.…”

Combined Convective and Microwave Drying of Grapes

“…Law diffusivities observed in the low moisture region (Table 7.3) indicate the possibility ofintemal control for mass transfer which could be the reason for the rapid drop in DR. Such a behaviour bas been observed in the drying ofmany food materials (Jaros et al, 1992;Karthanos et al, 1990;Saravacos and Raouzeos, 1986). A similar behaviour ofTg as discussed above was noticed at other combinations ofP and V..…”

“…It therefore fails to fit the data adequately over the entire range ofdrying. Realising these limitations many researchers tried to correlate diffusion coefficient with the temperature and changing moisture content (Pabis and Henderson, 1962;Chittenden and Hustrulid, 1966;Chu, 1966;Chu and Hustrulid, 1968;Hussain et al, 1973;Bruce, 1985;Syarief et • al., 1987;Haghighi et al, 1990;Parti and Dugbrnanics, 1990;Karthanos et al, 1990;Jayas et al, 1991;Jaros et al, 1992). Shivhare et al (1994) considered a varying surface moisture content with time and obtained an exponential drying coefficient ta account for varying conditions at the surface.…”

Computer-aided identification of the water diffusion coefficient for maize kernels dried in a thin layer

“…where: a 0 and b 0 are the empirical formula parameters to be identified; variant II (Jaros et al, 1992):…”