Mathematical Modeling of Drying Kinetics of Bird’s Eye Chilies in a Convective Hot-Air Dryer

Kongdej LIMPAIBOON

Authors

Kongdej LIMPAIBOON School of Agricultural Technology, Walailak University, Nakhon Si Thammarat 80161

Keywords:

Drying kinetics, modeling, hot air dryer, Bird’s eye chili, color

Abstract

The drying kinetics of red bird’s eye chilies and the color of the product were investigated in a laboratory scale hot-air dryer under 3 air temperatures of 55, 60 and 65 °C. The 6 mathematical models (Lewis model; Page model; Henderson and Pabis model; Logarithmic model; Modified Page model; and Wang and Singh model) were used to fit the experimental data obtained in order to estimate the moisture ratio as the function of drying time. The results showed that operating temperature enhanced the kinetics of the drying of chilies; the drying times of chilies at 55, 60 and 65°C were 510, 360 and 330 min, respectively. The experimental drying curves obtained at all operating conditions took place in the falling rate period. Comparing the dried products, it was observed that the red bird’s eye chilies dried at a lower temperature had higher Hunter L (lightness), a* (redness) and b* (yellowness) values. The experimental data were fitted to different drying models. The performance of these models was investigated by comparing the determination of coefficient (R²) and root mean square error (RMSE) between the observed and predicted moisture ratios. Among the 6 mathematical models, the Wang and Singh model satisfactorily described the drying kinetics of chilies.

doi:10.14456/WJST.2015.16

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Author Biography

Kongdej LIMPAIBOON, School of Agricultural Technology, Walailak University, Nakhon Si Thammarat 80161

School of Agricultural Technology

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