Premium
Comparative Study between Hot Air and Infrared Drying of Parboiled Rice: Kinetics and Qualities Aspects
Author(s) -
Bualuang O.,
Tirawanichakul Y.,
Tirawanichakul S.
Publication year - 2013
Publication title -
journal of food processing and preservation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.511
H-Index - 48
eISSN - 1745-4549
pISSN - 0145-8892
DOI - 10.1111/j.1745-4549.2012.00813.x
Subject(s) - air dryer , chemistry , kinetics , infrared , water content , infrared heater , diffusion , air temperature , moisture , equilibrium moisture content , food science , thermodynamics , meteorology , physics , quantum mechanics , optics , sorption , geotechnical engineering , organic chemistry , adsorption , engineering
The objectives of this study were to analyze the effects of drying employing three different heat sources on drying kinetics and to evaluate qualities of parboiled rice after drying. Drying temperature was varied between 60 and 100 C . Power of infrared ( IR ) heat source was fixed at 1,000 and 1,500 W and air flow rate was fixed at 1.0 ± 0.2 m/s. The three drying strategies composed of hot air ( HA ), IR and combined HA + IR drying. The experimental results were simulated using various equilibrium moisture content models and the mathematical drying model for prediction of drying kinetics and evaluation of effective diffusion coefficient ( D eff ) followed by F ick's law of diffusion. The results revealed that D eff values of HA and IR drying were in the range of 10 −12 –10 −11 m 2 /s and relatively depended on temperature. For quality evaluation, conclusions reached that head rice yield using HA + IR drying had the highest value, while yellowness and whiteness of the parboiled rice are significantly affected by drying condition (P > 0.05). Practical Applications These results suggested that combined hot air and infrared (HA + IR ) drying offers a great potential for preserving L eb N ok P attani parboiled rice. Drying kinetics and quality aspects determined that IR drying is more efficient than the other drying method. However, the color degradation in the grain kernel is an issue for quality measurement.