modeling of drying kinetics of paddy (cv. fajer) using a thin-layer dryer
Authors
abstract
rice is one of the most widely human consumed agricultural products. for a prevention or diminishing of rice cracking in its milling process, precision control of drying conditions is indispensable. in this research, a thin layer experimental dryer is employed to obtain paddy’s drying kinetics. drying experiments were conducted at five inlet temperatures of drying air of 30, 40, 50, 60 and 70 °c and four air velocities of 0.25, 0.5, 0.75 and 1 m/s, with three replications. the initial moisture content was about 27% (d.b.) at the start of all the runs. equilibrium moisture content was attained through a use of conventional empirical isotherm equations. drying curves of moisture ratio vs. time as well as drying rate vs. time were plotted from the obtained experimental data. drying curves obtained from the experimental data were fitted to eight different empirical thin layer models and compared with the help of three statistical parameters (r2, rmse and ). results show that approximation of diffusion model predicts moisture change in drying with a higher accuracy in comparison with the other models. the coefficient of determination (r2) for this model at the inlet drying air temperatures of 30, 40, 50, 60 and 70 °c were 0.999, 0.999, 0.999, 0.998 and 0.996, respectively. these results indicate that an approximation of diffusion can very accurately model the moisture ratio vs. time variations of paddy, and they as well indicate the applicability of thin-layer dryer for experimental works.
similar resources
drying kinetics and quality of barberry in a thin layer dryer
the objective of this study was to investigate dehydration kinetics of barberry (berberis vulgaris l.) at different drying temperatures (60 ºc, 70 ºc, 80 ºc), air velocities (0.3 m s-1, 0.5 m s-1, 1 m s-1) with two types of pretreatment. drying time and colour quality during dehydration were experimentally determined. barberries were dried from the initial moisture content of 73.44% (w.b.) to t...
full textDrying of calcium carbonate in a batch spouted bed dryer: optimization and kinetics modeling
In the present work, the drying of calcium carbonate in a batch spouted bed dryer with inert particles has been investigated experimentally. The effect of several operating parameters including air temperature (90, 100, and 110 ˚C), air velocity (Ums, 1.2 Ums, and 1.5 Ums), and dry solid mass (5, 10, 20 g) has been studied. The Taguchi method has been applied to determine the optimal parameters...
full textStudy on Drying Kinetics of Paddy Rice: Intermittent Drying
The intermittent drying characteristics of an Iranian popular paddy rice variety were experimentally investigated to determine the drying kinetics and obtain the effective moisture diffusivity. A lab-scale fluidized bed dryer was designed and constructed to enable obtaining the required results while controlling critical drying parameters. The effects of drying temperature and tempering per...
full textmodeling of thin layer drying of apricot
in this research the thin layer drying behavior of apricot (cv. ghavami and nasiry) at temperatures of drying air of 40, 50, 60 and 70 ºc and at drying air velocity of 2 ms-1 was studied. in order to select the best drying curve equation, 9 different thin layer drying models were fitted to the experimental data and were compared according to their coefficient of determination (r2), reduced chi-...
full textModelling of thin layer drying kinetics of sour cherry in a solar dryer and under open sun
Drying kinetics of sour cheery is investigated in solar dryer with forced convection and under open Sun with natural convection. Drying data were fitted to different mathematical models, whose performance was investigated by comparing coefficient (R), reduced chi-square (Ç) and root mean square error (RMSE) between the observed and predicted moisture ratios. Among these models, drying model dev...
full textmodeling drying kinetics of canola in fluidized bed dryer
modeling of drying kinetics of canola was studied at 30 to 100 ?c in a lab scale fluidized bed dryer. drying rate of the crop was assessed, using many conventional moisture ratio models employed in food science. effective diffusivity coefficient (deff) and activation energy (ea) of kernel moisture were determined using fick's law of diffusion and arrhenius equation. besides, the effects of...
full textMy Resources
Save resource for easier access later
Journal title:
مهندسی بیوسیستم ایرانجلد ۴۱، شماره ۲، صفحات ۱۵۳-۳۱۲
Keywords
Hosted on Doprax cloud platform doprax.com
copyright © 2015-2023